CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>Hardware description language - Wikipedia</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy", "wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"79c55075-005e-463a-9fca-3290284f0fc2","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Hardware_description_language","wgTitle":"Hardware description language","wgCurRevisionId":1252986001,"wgRevisionId":1252986001,"wgArticleId":74554,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["All articles with dead external links","Articles with dead external links from July 2024","Articles with permanently dead external links","Articles with short description","Short description is different from Wikidata","Articles needing additional references from January 2013","All articles needing additional references","Wikipedia articles that are too technical from April 2014","All articles that are too technical", "Articles with multiple maintenance issues","All articles needing expert attention","Articles needing expert attention from April 2014","All articles with unsourced statements","Articles with unsourced statements from July 2010","All articles with vague or ambiguous time","Vague or ambiguous time from April 2014","Wikipedia articles needing clarification from December 2018","Articles with unsourced statements from April 2014","Commons category link from Wikidata","Hardware description languages","Technical communication","Logic design","Programming language classification"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Hardware_description_language","wgRelevantArticleId":74554,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{"status":{"levels":1}}}, "wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":40000,"wgRelatedArticlesCompat":[],"wgCentralAuthMobileDomain":false,"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q173341","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.globalCssJs.user.styles":"ready","site.styles":"ready", "user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.cite.styles":"ready","ext.pygments":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","jquery.tablesorter.styles":"ready","jquery.makeCollapsible.styles":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.cite.ux-enhancements","ext.pygments.view","site","mediawiki.page.ready","jquery.tablesorter","jquery.makeCollapsible","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin","mmv.bootstrap","ext.popups","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging", "ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.cite.styles%7Cext.pygments%2CwikimediaBadges%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediamessages.styles%7Cjquery.makeCollapsible.styles%7Cjquery.tablesorter.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="Hardware description language - Wikipedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//en.m.wikipedia.org/wiki/Hardware_description_language"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=Hardware_description_language&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/Hardware_description_language"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="alternate" type="application/atom+xml" title="Wikipedia Atom feed" href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Hardware_description_language rootpage-Hardware_description_language skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Jump to content</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Main menu" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Main menu</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Main menu</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">hide</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navigation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Main_Page" title="Visit the main page [z]" accesskey="z"><span>Main page</span></a></li><li id="n-contents" class="mw-list-item"><a href="/wiki/Wikipedia:Contents" title="Guides to browsing Wikipedia"><span>Contents</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Portal:Current_events" title="Articles related to current events"><span>Current events</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Visit a randomly selected article [x]" accesskey="x"><span>Random article</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About" title="Learn about Wikipedia and how it works"><span>About Wikipedia</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us" title="How to contact Wikipedia"><span>Contact us</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Contribute </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="Guidance on how to use and edit Wikipedia"><span>Help</span></a></li><li id="n-introduction" class="mw-list-item"><a href="/wiki/Help:Introduction" title="Learn how to edit Wikipedia"><span>Learn to edit</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Community_portal" title="The hub for editors"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes to Wikipedia [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_upload_wizard" title="Add images or other media for use on Wikipedia"><span>Upload file</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Main_Page" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="The Free Encyclopedia" src="/static/images/mobile/copyright/wikipedia-tagline-en.svg" width="117" height="13" style="width: 7.3125em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search Wikipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Appearance" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Appearance</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=Hardware+description+language" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=Hardware+description+language" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Log in and more options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Hardware+description+language" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Hardware+description+language" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contents</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Motivation" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Motivation"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Motivation</span> </div> </a> <ul id="toc-Motivation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Structure_of_HDL" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Structure_of_HDL"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Structure of HDL</span> </div> </a> <button aria-controls="toc-Structure_of_HDL-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Structure of HDL subsection</span> </button> <ul id="toc-Structure_of_HDL-sublist" class="vector-toc-list"> <li id="toc-Comparison_with_control-flow_languages" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Comparison_with_control-flow_languages"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Comparison with control-flow languages</span> </div> </a> <ul id="toc-Comparison_with_control-flow_languages-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-History" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#History"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>History</span> </div> </a> <ul id="toc-History-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Design_using_HDL" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Design_using_HDL"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Design using HDL</span> </div> </a> <ul id="toc-Design_using_HDL-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Simulating_and_debugging_HDL_code" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Simulating_and_debugging_HDL_code"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Simulating and debugging HDL code</span> </div> </a> <ul id="toc-Simulating_and_debugging_HDL_code-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Design_verification_with_HDLs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Design_verification_with_HDLs"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Design verification with HDLs</span> </div> </a> <ul id="toc-Design_verification_with_HDLs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HDL_and_programming_languages" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#HDL_and_programming_languages"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>HDL and programming languages</span> </div> </a> <ul id="toc-HDL_and_programming_languages-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-High-level_synthesis" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#High-level_synthesis"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>High-level synthesis</span> </div> </a> <ul id="toc-High-level_synthesis-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Examples_of_HDLs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Examples_of_HDLs"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Examples of HDLs</span> </div> </a> <button aria-controls="toc-Examples_of_HDLs-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Examples of HDLs subsection</span> </button> <ul id="toc-Examples_of_HDLs-sublist" class="vector-toc-list"> <li id="toc-HDLs_for_analog_circuit_design" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HDLs_for_analog_circuit_design"> <div class="vector-toc-text"> <span class="vector-toc-numb">9.1</span> <span>HDLs for analog circuit design</span> </div> </a> <ul id="toc-HDLs_for_analog_circuit_design-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HDLs_for_digital_circuit_design" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HDLs_for_digital_circuit_design"> <div class="vector-toc-text"> <span class="vector-toc-numb">9.2</span> <span>HDLs for digital circuit design</span> </div> </a> <ul id="toc-HDLs_for_digital_circuit_design-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HDLs_for_printed_circuit_board_design" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HDLs_for_printed_circuit_board_design"> <div class="vector-toc-text"> <span class="vector-toc-numb">9.3</span> <span>HDLs for printed circuit board design</span> </div> </a> <ul id="toc-HDLs_for_printed_circuit_board_design-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">12</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Hardware description language</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 27 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-27" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">27 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%84%D8%BA%D8%A9_%D8%AA%D9%88%D8%B5%D9%8A%D9%81_%D8%A7%D9%84%D8%B9%D8%AA%D8%A7%D8%AF" title="لغة توصيف العتاد – Arabic" lang="ar" hreflang="ar" data-title="لغة توصيف العتاد" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B9%E0%A6%BE%E0%A6%B0%E0%A7%8D%E0%A6%A1%E0%A6%93%E0%A6%AF%E0%A6%BC%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%B0_%E0%A6%A1%E0%A7%87%E0%A6%B8%E0%A6%95%E0%A7%8D%E0%A6%B0%E0%A6%BF%E0%A6%AA%E0%A6%B6%E0%A6%A8_%E0%A6%B2%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%99%E0%A7%8D%E0%A6%97%E0%A7%81%E0%A6%AF%E0%A6%BC%E0%A7%87%E0%A6%9C" title="হার্ডওয়্যার ডেসক্রিপশন ল্যাঙ্গুয়েজ – Bangla" lang="bn" hreflang="bn" data-title="হার্ডওয়্যার ডেসক্রিপশন ল্যাঙ্গুয়েজ" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Llenguatge_de_descripci%C3%B3_de_maquinari" title="Llenguatge de descripció de maquinari – Catalan" lang="ca" hreflang="ca" data-title="Llenguatge de descripció de maquinari" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Hardwarebeschreibungssprache" title="Hardwarebeschreibungssprache – German" lang="de" hreflang="de" data-title="Hardwarebeschreibungssprache" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Riistvarakirjelduskeel" title="Riistvarakirjelduskeel – Estonian" lang="et" hreflang="et" data-title="Riistvarakirjelduskeel" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%93%CE%BB%CF%8E%CF%83%CF%83%CE%B1_%CF%80%CE%B5%CF%81%CE%B9%CE%B3%CF%81%CE%B1%CF%86%CE%AE%CF%82_%CF%85%CE%BB%CE%B9%CE%BA%CE%BF%CF%8D" title="Γλώσσα περιγραφής υλικού – Greek" lang="el" hreflang="el" data-title="Γλώσσα περιγραφής υλικού" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Lenguaje_de_descripci%C3%B3n_de_hardware" title="Lenguaje de descripción de hardware – Spanish" lang="es" hreflang="es" data-title="Lenguaje de descripción de hardware" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B2%D8%A8%D8%A7%D9%86_%D8%AA%D9%88%D8%B5%DB%8C%D9%81_%D8%B3%D8%AE%D8%AA%E2%80%8C%D8%A7%D9%81%D8%B2%D8%A7%D8%B1" title="زبان توصیف سخت‌افزار – Persian" lang="fa" hreflang="fa" data-title="زبان توصیف سخت‌افزار" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Langage_de_description_de_mat%C3%A9riel" title="Langage de description de matériel – French" lang="fr" hreflang="fr" data-title="Langage de description de matériel" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%95%98%EB%93%9C%EC%9B%A8%EC%96%B4_%EA%B8%B0%EC%88%A0_%EC%96%B8%EC%96%B4" title="하드웨어 기술 언어 – Korean" lang="ko" hreflang="ko" data-title="하드웨어 기술 언어" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B9%E0%A4%BE%E0%A4%B0%E0%A5%8D%E0%A4%A1%E0%A4%B5%E0%A5%87%E0%A4%AF%E0%A4%B0_%E0%A4%B5%E0%A4%B0%E0%A5%8D%E0%A4%A3%E0%A4%A8_%E0%A4%95%E0%A5%80_%E0%A4%AD%E0%A4%BE%E0%A4%B7%E0%A4%BE" title="हार्डवेयर वर्णन की भाषा – Hindi" lang="hi" hreflang="hi" data-title="हार्डवेयर वर्णन की भाषा" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/V%C3%A9lb%C3%BAna%C3%B0arl%C3%BDsingarm%C3%A1l" title="Vélbúnaðarlýsingarmál – Icelandic" lang="is" hreflang="is" data-title="Vélbúnaðarlýsingarmál" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Hardware_description_language" title="Hardware description language – Italian" lang="it" hreflang="it" data-title="Hardware description language" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A9%D7%A4%D7%AA_%D7%AA%D7%99%D7%90%D7%95%D7%A8_%D7%97%D7%95%D7%9E%D7%A8%D7%94" title="שפת תיאור חומרה – Hebrew" lang="he" hreflang="he" data-title="שפת תיאור חומרה" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Bahasa_takrifan_perkakasan" title="Bahasa takrifan perkakasan – Malay" lang="ms" hreflang="ms" data-title="Bahasa takrifan perkakasan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Hardwarebeschrijvingstaal" title="Hardwarebeschrijvingstaal – Dutch" lang="nl" hreflang="nl" data-title="Hardwarebeschrijvingstaal" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%8F%E3%83%BC%E3%83%89%E3%82%A6%E3%82%A7%E3%82%A2%E8%A8%98%E8%BF%B0%E8%A8%80%E8%AA%9E" title="ハードウェア記述言語 – Japanese" lang="ja" hreflang="ja" data-title="ハードウェア記述言語" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Hardware_Description_Language" title="Hardware Description Language – Polish" lang="pl" hreflang="pl" data-title="Hardware Description Language" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Linguagem_de_descri%C3%A7%C3%A3o_de_hardware" title="Linguagem de descrição de hardware – Portuguese" lang="pt" hreflang="pt" data-title="Linguagem de descrição de hardware" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AF%D0%B7%D1%8B%D0%BA_%D0%BE%D0%BF%D0%B8%D1%81%D0%B0%D0%BD%D0%B8%D1%8F_%D0%B0%D0%BF%D0%BF%D0%B0%D1%80%D0%B0%D1%82%D1%83%D1%80%D1%8B" title="Язык описания аппаратуры – Russian" lang="ru" hreflang="ru" data-title="Язык описания аппаратуры" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Jezik_za_opis_hardvera" title="Jezik za opis hardvera – Serbian" lang="sr" hreflang="sr" data-title="Jezik za opis hardvera" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Laitteistokuvauskieli" title="Laitteistokuvauskieli – Finnish" lang="fi" hreflang="fi" data-title="Laitteistokuvauskieli" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/H%C3%A5rdvarubeskrivande_spr%C3%A5k" title="Hårdvarubeskrivande språk – Swedish" lang="sv" hreflang="sv" data-title="Hårdvarubeskrivande språk" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Donan%C4%B1m_tan%C4%B1mlama_dili" title="Donanım tanımlama dili – Turkish" lang="tr" hreflang="tr" data-title="Donanım tanımlama dili" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9C%D0%BE%D0%B2%D0%B8_%D0%BE%D0%BF%D0%B8%D1%81%D1%83_%D0%B0%D0%BF%D0%B0%D1%80%D0%B0%D1%82%D1%83%D1%80%D0%B8" title="Мови опису апаратури – Ukrainian" lang="uk" hreflang="uk" data-title="Мови опису апаратури" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ng%C3%B4n_ng%E1%BB%AF_m%C3%B4_t%E1%BA%A3_ph%E1%BA%A7n_c%E1%BB%A9ng" title="Ngôn ngữ mô tả phần cứng – Vietnamese" lang="vi" hreflang="vi" data-title="Ngôn ngữ mô tả phần cứng" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%A1%AC%E4%BB%B6%E6%8F%8F%E8%BF%B0%E8%AF%AD%E8%A8%80" title="硬件描述语言 – Chinese" lang="zh" hreflang="zh" data-title="硬件描述语言" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q173341#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Hardware_description_language" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:Hardware_description_language" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Hardware_description_language"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Hardware_description_language&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Hardware_description_language&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Hardware_description_language"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Hardware_description_language&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Hardware_description_language&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Hardware_description_language" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Hardware_description_language" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Hardware_description_language&oldid=1252986001" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Hardware_description_language&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=Hardware_description_language&id=1252986001&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHardware_description_language"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHardware_description_language"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Hardware_description_language&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Hardware_description_language&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Hardware_description_languages" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q173341" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Specialized computer language used to describe electronic circuits</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><style data-mw-deduplicate="TemplateStyles:r1248332772">.mw-parser-output .multiple-issues-text{width:95%;margin:0.2em 0}.mw-parser-output .multiple-issues-text>.mw-collapsible-content{margin-top:0.3em}.mw-parser-output .compact-ambox .ambox{border:none;border-collapse:collapse;background-color:transparent;margin:0 0 0 1.6em!important;padding:0!important;width:auto;display:block}body.mediawiki .mw-parser-output .compact-ambox .ambox.mbox-small-left{font-size:100%;width:auto;margin:0}.mw-parser-output .compact-ambox .ambox .mbox-text{padding:0!important;margin:0!important}.mw-parser-output .compact-ambox .ambox .mbox-text-span{display:list-item;line-height:1.5em;list-style-type:disc}body.skin-minerva .mw-parser-output .multiple-issues-text>.mw-collapsible-toggle,.mw-parser-output .compact-ambox .ambox .mbox-image,.mw-parser-output .compact-ambox .ambox .mbox-imageright,.mw-parser-output .compact-ambox .ambox .mbox-empty-cell,.mw-parser-output .compact-ambox .hide-when-compact{display:none}</style><table class="box-Multiple_issues plainlinks metadata ambox ambox-content ambox-multiple_issues compact-ambox" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span"><div class="multiple-issues-text mw-collapsible"><b>This article has multiple issues.</b> Please help <b><a href="/wiki/Special:EditPage/Hardware_description_language" title="Special:EditPage/Hardware description language">improve it</a></b> or discuss these issues on the <b><a href="/wiki/Talk:Hardware_description_language" title="Talk:Hardware description language">talk page</a></b>. <small><i>(<a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove these messages</a>)</i></small> <div class="mw-collapsible-content"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Hardware_description_language" title="Special:EditPage/Hardware description language">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Hardware+description+language%22">"Hardware description language"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Hardware+description+language%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Hardware+description+language%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Hardware+description+language%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Hardware+description+language%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Hardware+description+language%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">January 2013</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Technical plainlinks metadata ambox ambox-style ambox-technical" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/40px-Edit-clear.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/60px-Edit-clear.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/80px-Edit-clear.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>may be too technical for most readers to understand</b>.<span class="hide-when-compact"> Please <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Hardware_description_language&action=edit">help improve it</a> to <a href="/wiki/Wikipedia:Make_technical_articles_understandable" title="Wikipedia:Make technical articles understandable">make it understandable to non-experts</a>, without removing the technical details.</span> <span class="date-container"><i>(<span class="date">April 2014</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> </div> </div><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>In <a href="/wiki/Computer_engineering" title="Computer engineering">computer engineering</a>, a <b>hardware description language</b> (<b>HDL</b>) is a specialized <a href="/wiki/Computer_language" title="Computer language">computer language</a> used to describe the structure and behavior of <a href="/wiki/Electronic_circuit" title="Electronic circuit">electronic circuits</a>, usually to design <a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">application-specific integrated circuits</a> (ASICs) and to program <a href="/wiki/Field-programmable_gate_array" title="Field-programmable gate array">field-programmable gate arrays</a> (FPGAs). </p><p>A hardware description language enables a precise, <a href="/wiki/Formal_language" title="Formal language">formal</a> description of an electronic circuit that allows for the automated analysis and <a href="/wiki/Electronic_circuit_simulation" title="Electronic circuit simulation">simulation</a> of the circuit. It also allows for the <a href="/wiki/Logic_synthesis" title="Logic synthesis">synthesis</a> of an HDL description into a <a href="/wiki/Netlist" title="Netlist">netlist</a> (a specification of physical electronic components and how they are connected together), which can then be <a href="/wiki/Place_and_route" title="Place and route">placed and routed</a> to produce the <a href="/wiki/Mask_set" class="mw-redirect" title="Mask set">set of masks</a> used to create an <a href="/wiki/Integrated_circuit" title="Integrated circuit">integrated circuit</a>. </p><p>A hardware description language looks much like a <a href="/wiki/Programming_language" title="Programming language">programming language</a> such as <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> or <a href="/wiki/ALGOL" title="ALGOL">ALGOL</a>; it is a textual description consisting of expressions, statements and control structures. One important difference between most programming languages and HDLs is that HDLs explicitly include the notion of time. </p><p>HDLs form an integral part of <a href="/wiki/Electronic_design_automation" title="Electronic design automation">electronic design automation</a> (EDA) systems, especially for complex circuits, such as <a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">application-specific integrated circuits</a>, <a href="/wiki/Microprocessor" title="Microprocessor">microprocessors</a>, and <a href="/wiki/Programmable_logic_device" title="Programmable logic device">programmable logic devices</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Motivation">Motivation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=1" title="Edit section: Motivation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Due to the exploding complexity of digital electronic circuits since the 1970s (see <a href="/wiki/Moore%27s_law" title="Moore's law">Moore's law</a>), circuit designers needed <a href="/wiki/Digital_logic" class="mw-redirect" title="Digital logic">digital logic</a> descriptions to be performed at a high level without being tied to a specific electronic technology, such as <a href="/wiki/Emitter-coupled_logic" title="Emitter-coupled logic">ECL</a>, <a href="/wiki/Transistor%E2%80%93transistor_logic" title="Transistor–transistor logic">TTL</a> or <a href="/wiki/CMOS" title="CMOS">CMOS</a>. HDLs were created to implement <a href="/wiki/Register-transfer_level" title="Register-transfer level">register-transfer level</a> abstraction, a model of the data flow and timing of a circuit.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>There are two major hardware description languages: <a href="/wiki/VHDL" title="VHDL">VHDL</a> and <a href="/wiki/Verilog" title="Verilog">Verilog</a>. There are different types of description in them: "dataflow, behavioral and structural". Example of dataflow of VHDL: </p> <div class="mw-highlight mw-highlight-lang-vhdl mw-content-ltr" dir="ltr"><pre><span></span><span class="k">LIBRARY</span><span class="w"> </span><span class="nn">IEEE</span><span class="p">;</span> <span class="k">USE</span><span class="w"> </span><span class="nn">IEEE.STD_LOGIC_1164.</span><span class="k">ALL</span><span class="p">;</span> <span class="k">ENTITY</span><span class="w"> </span><span class="nc">not1</span><span class="w"> </span><span class="k">IS</span> <span class="w"> </span><span class="k">PORT</span><span class="p">(</span> <span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">IN</span><span class="w"> </span><span class="kt">STD_LOGIC</span><span class="p">;</span> <span class="w"> </span><span class="n">b</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">OUT</span><span class="w"> </span><span class="kt">STD_LOGIC</span> <span class="w"> </span><span class="p">);</span> <span class="k">END</span><span class="w"> </span><span class="nc">not1</span><span class="p">;</span> <span class="k">ARCHITECTURE</span><span class="w"> </span><span class="nc">behavioral</span><span class="w"> </span><span class="k">OF</span><span class="w"> </span><span class="nc">not1</span><span class="w"> </span><span class="k">IS</span> <span class="k">BEGIN</span> <span class="w"> </span><span class="n">b</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="n">a</span><span class="p">;</span> <span class="k">END</span><span class="w"> </span><span class="nc">behavioral</span><span class="p">;</span> </pre></div> <div class="mw-heading mw-heading2"><h2 id="Structure_of_HDL">Structure of HDL</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=2" title="Edit section: Structure of HDL"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>HDLs are standard text-based expressions of the structure of electronic systems and their behaviour over time. Like <a href="/wiki/Concurrent_programming" class="mw-redirect" title="Concurrent programming">concurrent programming</a> languages, HDL syntax and semantics include explicit notations for expressing <a href="/wiki/Concurrency_(computer_science)" title="Concurrency (computer science)">concurrency</a>. However, in contrast to most software <a href="/wiki/Programming_language" title="Programming language">programming languages</a>, HDLs also include an explicit notion of time, which is a primary attribute of hardware. Languages whose only characteristic is to express circuit connectivity between a hierarchy of blocks are properly classified as <a href="/wiki/Netlist" title="Netlist">netlist</a> languages used in electric <a href="/wiki/Computer-aided_design" title="Computer-aided design">computer-aided design</a>. HDL can be used to express designs in structural, behavioral or register-transfer-level architectures for the same circuit functionality; in the latter two cases the <a href="/wiki/Logic_synthesis" title="Logic synthesis">synthesizer</a> decides the architecture and logic gate layout. </p><p>HDLs are used to write executable specifications for hardware. A program designed to implement the underlying semantics of the language statements and simulate the progress of time provides the hardware designer with the ability to model a piece of hardware before it is created physically. It is this executability that gives HDLs the illusion of being <a href="/wiki/Programming_languages" class="mw-redirect" title="Programming languages">programming languages</a>, when they are more precisely classified as <a href="/wiki/Specification_language" title="Specification language">specification languages</a> or <a href="/wiki/Modeling_language" title="Modeling language">modeling languages</a>. Simulators capable of supporting discrete-event (digital) and continuous-time (analog) modeling exist, and HDLs targeted for each are available. </p> <div class="mw-heading mw-heading3"><h3 id="Comparison_with_control-flow_languages">Comparison with control-flow languages</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=3" title="Edit section: Comparison with control-flow languages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is certainly possible to represent hardware semantics using traditional programming languages such as <a href="/wiki/C%2B%2B" title="C++">C++</a>, which operate on <a href="/wiki/Control_flow" title="Control flow">control flow</a> semantics as opposed to <a href="/wiki/Data_flow" class="mw-redirect" title="Data flow">data flow</a>, although to function as such, programs must be augmented with extensive and unwieldy <a href="/wiki/Class_library#Object_and_class_libraries" class="mw-redirect" title="Class library">class libraries</a>. Generally, however, software programming languages do not include any capability for explicitly expressing time, and thus cannot function as hardware description languages. Before the introduction of <a href="/wiki/System_Verilog" class="mw-redirect" title="System Verilog">System Verilog</a> in 2002, <a href="/wiki/C%2B%2B" title="C++">C++</a> integration with a <a href="/wiki/Logic_simulation" title="Logic simulation">logic simulator</a> was one of the few ways to use <a href="/wiki/Object-oriented_programming" title="Object-oriented programming">object-oriented programming</a> in hardware verification. System Verilog is the first major HDL to offer object orientation and garbage collection. </p><p>Using the proper subset of hardware description language, a program called a synthesizer, or <a href="/wiki/Logic_synthesis" title="Logic synthesis">logic synthesis tool</a>, can infer hardware logic operations from the language statements and produce an equivalent netlist of generic hardware primitives<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style#Technical_language" title="Wikipedia:Manual of Style"><span title="The material near this tag may be using jargon that limits the article's accessibility. (April 2014)">jargon</span></a></i>]</sup> to implement the specified behaviour.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2010)">citation needed</span></a></i>]</sup> Synthesizers generally ignore the expression of any timing constructs in the text. Digital logic synthesizers, for example, generally use <a href="/wiki/Clock_signal" title="Clock signal">clock edges</a> as the way to time the circuit, ignoring any timing constructs. The ability to have a synthesizable subset of the language does not itself make a hardware description language. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=4" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The first hardware description languages appeared in the late 1960s, looking like more traditional languages.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The first that had a lasting effect was described in 1971 in <a href="/wiki/Gordon_Bell" title="Gordon Bell">C. Gordon Bell</a> and Allen Newell's text <i>Computer Structures</i>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> This text introduced the concept of <a href="/wiki/Register_transfer_level" class="mw-redirect" title="Register transfer level">register transfer level</a>, first used in the ISP language to describe the behavior of the <a href="/wiki/Digital_Equipment_Corporation" title="Digital Equipment Corporation">Digital Equipment Corporation</a> (DEC) <a href="/wiki/PDP-8" title="PDP-8">PDP-8</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>The language became more widespread with the introduction of DEC's PDP-16 RT-Level Modules (RTMs) and a book describing their use.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> At least two implementations of the basic ISP language (ISPL and ISPS) followed.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> ISPS was well suited to describe relations between the <a href="/wiki/Input/output" title="Input/output">inputs and the outputs</a> of the design and was quickly adopted by commercial teams at DEC, and by several research teams in the US and among its allies in the North Atlantic Treaty Organization (<a href="/wiki/NATO" title="NATO">NATO</a>). </p><p>The RTM products never succeeded commercially and DEC stopped marketing them in the mid-1980s, as new methods grew more popular, more so <a href="/wiki/Very-large-scale_integration" title="Very-large-scale integration">very-large-scale integration</a> (VLSI). </p><p>Separate work done about 1979 at the <a href="/wiki/University_of_Kaiserslautern" class="mw-redirect" title="University of Kaiserslautern">University of Kaiserslautern</a> produced a language called KARL ("KAiserslautern Register Transfer Language"), which included design calculus language features supporting VLSI chip floorplanning<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style#Technical_language" title="Wikipedia:Manual of Style"><span title="The material near this tag may be using jargon that limits the article's accessibility. (April 2014)">jargon</span></a></i>]</sup> and structured hardware design. This work was also the basis of KARL's interactive graphic sister language ABL, whose name was an <a href="/wiki/Initialism" class="mw-redirect" title="Initialism">initialism</a> for "A Block diagram Language".<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> ABL was implemented in the early 1980s by the Centro Studi e Laboratori Telecomunicazioni (<a href="/wiki/CSELT" title="CSELT">CSELT</a>) in Torino, Italy, producing the ABLED graphic VLSI design editor. In the mid-1980s, a VLSI design framework was implemented around KARL and ABL by an international consortium funded by the Commission of the European Union.<sup id="cite_ref-Hartenstein93_9-0" class="reference"><a href="#cite_note-Hartenstein93-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>By the late 1970s, design using <a href="/wiki/Programmable_logic_device" title="Programmable logic device">programmable logic devices</a> (PLDs) became popular, although these designs were primarily limited to designing <a href="/wiki/Finite-state_machine" title="Finite-state machine">finite-state machines</a>. The work at <a href="/wiki/Data_General" title="Data General">Data General</a> in 1980 used these same devices to design the <a href="/wiki/Data_General_Eclipse_MV/8000" title="Data General Eclipse MV/8000">Data General Eclipse MV/8000</a>, and commercial need began to grow for a language that could map well to them. By 1983 <a href="/wiki/Data_I/O" title="Data I/O">Data I/O</a> introduced ABEL to fill that need. </p><p>In 1985, as design shifted to VLSI, <a href="/wiki/Gateway_Design_Automation" title="Gateway Design Automation">Gateway Design Automation</a> introduced <a href="/wiki/Verilog" title="Verilog">Verilog</a>, and <a href="/wiki/Intermetrics" class="mw-redirect" title="Intermetrics">Intermetrics</a> released the first completed version of the VHSIC Hardware Description Language (<a href="/wiki/VHDL" title="VHDL">VHDL</a>). VHDL was developed at the behest of the <a href="/wiki/United_States_Department_of_Defense" title="United States Department of Defense">United States Department of Defense</a>'s <a href="/wiki/Very_High_Speed_Integrated_Circuit_Program" title="Very High Speed Integrated Circuit Program">Very High Speed Integrated Circuit Program</a> (VHSIC), and was based on the <a href="/wiki/Ada_(programming_language)" title="Ada (programming language)">Ada programming language</a>, and on the experience gained with the earlier development of ISPS.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Initially, Verilog and VHDL were used to document and simulate circuit designs already captured and described in another form (such as <a href="/wiki/Schematic" title="Schematic">schematic</a> files). HDL simulation enabled engineers to work at a higher level of abstraction than simulation at the schematic level, and thus increased design capacity from hundreds of transistors to thousands.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2010)">citation needed</span></a></i>]</sup> In 1986, with the support of the U.S Department of Defense, <a href="/wiki/VHDL" title="VHDL">VHDL</a> was sponsored as an <a href="/wiki/IEEE_standard" class="mw-redirect" title="IEEE standard">IEEE standard</a> (IEEE Std 1076), and the first IEEE-standardized version of VHDL, IEEE Std 1076-1987, was approved in December 1987. <a href="/wiki/Cadence_Design_Systems" title="Cadence Design Systems">Cadence Design Systems</a> later acquired Gateway Design Automation for the rights to Verilog-XL, the HDL simulator that would become the de facto standard of <a href="/w/index.php?title=Verilog_simulators&action=edit&redlink=1" class="new" title="Verilog simulators (page does not exist)">Verilog simulators</a> for the next decade. </p><p>The introduction of <a href="/wiki/Logic_synthesis" title="Logic synthesis">logic synthesis</a> for HDLs pushed HDLs from the background into the foreground of digital design. Synthesis tools compiled HDL <a href="/wiki/Source_files" class="mw-redirect" title="Source files">source files</a> (written in a constrained format called RTL) into a manufacturable netlist description in terms of <a href="/wiki/Gate" title="Gate">gates</a> and <a href="/wiki/Transistor" title="Transistor">transistors</a>. Writing synthesizable RTL files required practice and discipline on the part of the designer; compared to a traditional schematic layout, synthesized RTL netlists were almost always larger in area and slower in performance<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2010)">citation needed</span></a></i>]</sup>. A circuit design from a skilled engineer, using labor-intensive schematic-capture/hand-layout, would almost always outperform its logically-synthesized equivalent, but the productivity advantage held by synthesis soon displaced digital schematic capture to exactly those areas that were problematic for RTL synthesis: extremely high-speed, low-power, or asynchronous circuitry. </p><p>Within a few years, VHDL and Verilog emerged as the dominant HDLs in the electronics industry, while older and less capable HDLs gradually disappeared from use. However, VHDL and Verilog share many of the same limitations, such as being unsuitable for analog or <a href="/wiki/Mixed-signal_integrated_circuit" title="Mixed-signal integrated circuit">mixed-signal circuit</a> simulation. Specialized HDLs (such as Confluence) were introduced with the explicit goal of fixing specific limitations of Verilog and VHDL, though none were ever intended to replace them. </p><p>Over the years, much effort has been invested in improving HDLs. The latest iteration of Verilog, formally known as IEEE 1800-2005 SystemVerilog, introduces many new features (classes, random variables, and properties/assertions) to address the growing need for better <a href="/wiki/Test_bench" title="Test bench">test bench</a> randomization, design hierarchy, and reuse. A future revision of VHDL is also in development<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Chronological_items" title="Wikipedia:Manual of Style/Dates and numbers"><span title="The time period mentioned near this tag is ambiguous. (April 2014)">when?</span></a></i>]</sup>, and is expected to match SystemVerilog's improvements. </p> <div class="mw-heading mw-heading2"><h2 id="Design_using_HDL">Design using HDL</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=5" title="Edit section: Design using HDL"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As a result of the efficiency gains realized using HDL, a majority of modern digital circuit design revolves around it. Most designs begin as a set of requirements or a high-level architectural diagram. Control and decision structures are often prototyped in <a href="/wiki/Flowchart" title="Flowchart">flowchart</a> applications, or entered in a editor. The process of writing the HDL description is highly dependent on the nature of the circuit and the designer's preference for coding style. The HDL is merely the 'capture language', often beginning with a high-level algorithmic description such as a C++ mathematical model. Designers often use scripting languages such as <a href="/wiki/Perl" title="Perl">Perl</a> to automatically generate repetitive circuit structures in the HDL language. Special text editors offer features for automatic indentation, syntax-dependent coloration, and <a href="/wiki/Macro_(computer_science)" title="Macro (computer science)">macro</a>-based expansion of the entity/architecture/signal declaration. </p><p>The HDL code then undergoes a code review, or auditing. In preparation for synthesis, the HDL description is subject to an array of automated checkers. The checkers report deviations from standardized code guidelines, identify potential ambiguous code constructs before they can cause misinterpretation, and check for common logical coding errors, such as floating <a href="/wiki/Port_(circuit_theory)" title="Port (circuit theory)">ports</a> or <a href="/wiki/Short_circuit" title="Short circuit">shorted</a> outputs. This process aids in resolving errors before the code is synthesized. </p><p>In industry parlance, HDL design generally ends at the synthesis stage. Once the synthesis tool has mapped the HDL description into a gate netlist, the netlist is passed off to the back-end stage. Depending on the physical technology (<a href="/wiki/Field-programmable_gate_array" title="Field-programmable gate array">FPGA</a>, <a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">ASIC</a> <a href="/wiki/Gate_array" title="Gate array">gate array</a>, ASIC <a href="/wiki/Standard_cell" title="Standard cell">standard cell</a>), HDLs may or may not play a significant role in the back-end flow. In general, as the design flow progresses toward a physically realizable form, the design database becomes progressively more laden with technology-specific information, which cannot be stored in a generic HDL description. Finally, an integrated circuit is manufactured or programmed for use. </p> <div class="mw-heading mw-heading2"><h2 id="Simulating_and_debugging_HDL_code">Simulating and debugging HDL code</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=6" title="Edit section: Simulating and debugging HDL code"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Logic_simulation" title="Logic simulation">Logic simulation</a></div> <p>Essential to HDL design is the ability to simulate HDL programs. Simulation allows an HDL description of a design (called a model) to pass <a href="/wiki/Functional_verification" title="Functional verification">design verification</a>, an important milestone that validates the design's intended function (specification) against the code implementation in the HDL description. It also permits architectural exploration. The engineer can experiment with design choices by writing multiple variations of a base design, then comparing their behavior in simulation. Thus, simulation is critical for successful HDL design. </p><p>To simulate an HDL model, an engineer writes a top-level simulation environment (called a <a href="/wiki/Test_bench" title="Test bench">test bench</a>). At minimum, a testbench contains an instantiation of the model (called the device under test or DUT), pin/signal declarations for the model's I/O, and a clock waveform. The testbench code is event driven: the engineer writes HDL statements to implement the (testbench-generated) reset-signal, to model interface transactions (such as a host–bus read/write), and to monitor the DUT's output. An HDL simulator — the program that executes the testbench — maintains the simulator clock, which is the master reference for all events in the testbench simulation. Events occur only at the instants dictated by the testbench HDL (such as a reset-toggle coded into the testbench), or in reaction (by the model) to stimulus and triggering events. Modern HDL simulators have full-featured <a href="/wiki/Graphical_user_interface" title="Graphical user interface">graphical user interfaces</a>, complete with a suite of debug tools. These allow the user to stop and restart the simulation at any time, insert simulator breakpoints (independent of the HDL code), and monitor or modify any element in the HDL model hierarchy. Modern simulators can also link the HDL environment to user-compiled libraries, through a defined <a href="/wiki/Verilog#Program_Language_Interface_(PLI)" title="Verilog">PLI</a>/<a href="/w/index.php?title=VHDL_Programming_Language_Interface&action=edit&redlink=1" class="new" title="VHDL Programming Language Interface (page does not exist)">VHPI</a> interface. Linking is system-dependent (<a href="/wiki/X86" title="X86">x86</a>, <a href="/wiki/SPARC" title="SPARC">SPARC</a> etc. running <a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Windows</a>/<a href="/wiki/Linux" title="Linux">Linux</a>/<a href="/wiki/Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a>), as the HDL simulator and user libraries are compiled and linked outside the HDL environment. </p><p>Design verification is often the most time-consuming portion of the design process, due to the disconnect between a device's <a href="/wiki/Functional_specification" title="Functional specification">functional specification</a>, the designer's interpretation of the specification, and the imprecision<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2010)">citation needed</span></a></i>]</sup> of the HDL language. The majority of the initial test/debug cycle is conducted in the HDL <i>simulator</i> environment, as the early stage of the design is subject to frequent and major circuit changes. An HDL description can also be prototyped and tested in hardware — <a href="/wiki/Programmable_logic_device" title="Programmable logic device">programmable logic devices</a> are often used for this purpose. Hardware prototyping is comparatively more expensive than HDL simulation, but offers a real-world view of the design. Prototyping is the best way to check interfacing against other hardware devices and hardware prototypes. Even those running on slow FPGAs offer much shorter simulation times than pure HDL simulation. </p> <div class="mw-heading mw-heading2"><h2 id="Design_verification_with_HDLs">Design verification with HDLs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=7" title="Edit section: Design verification with HDLs"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Functional_verification" title="Functional verification">Functional verification</a></div> <p>Historically, design verification was a laborious, repetitive loop of writing and running simulation <a href="/wiki/Test_case" title="Test case">test cases</a> against the design under test. As chip designs have grown larger and more complex, the task of design verification has grown to the point where it now dominates the schedule of a design team. Looking for ways to improve design productivity, the <a href="/wiki/Electronic_design_automation" title="Electronic design automation">electronic design automation</a> industry developed the <a href="/wiki/Property_Specification_Language" title="Property Specification Language">Property Specification Language</a>. </p><p>In <a href="/wiki/Formal_verification" title="Formal verification">formal verification</a> terms, a property is a factual statement about the expected or assumed behavior of another object. Ideally, for a given HDL description, a property or properties can be proven true or false using formal mathematical methods. In practical terms, many properties cannot be proven because they occupy an unbounded <a href="/wiki/Solution_space" class="mw-redirect" title="Solution space">solution space</a>. However, if provided a set of operating assumptions or constraints, a property checker can prove (or disprove) certain properties by narrowing the solution space. </p><p>The assertions do not model circuit activity, but capture and document the designer's intent in the HDL code. In a simulation environment, the simulator evaluates all specified assertions, reporting the location and severity of any violations. In a synthesis environment, the synthesis tool usually operates with the policy of halting synthesis upon any violation. Assertion based verification is still in its infancy, but is expected to become an integral part of the HDL design toolset. </p> <div class="mw-heading mw-heading2"><h2 id="HDL_and_programming_languages">HDL and programming languages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=8" title="Edit section: HDL and programming languages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An HDL is grossly similar to a software <a href="/wiki/Programming_language" title="Programming language">programming language</a>, but there are major differences. Most programming languages are inherently <a href="/wiki/Procedural_programming" title="Procedural programming">procedural</a> (single-threaded), with limited syntactical and semantic support to handle <a href="/wiki/Concurrency_(programming)" class="mw-redirect" title="Concurrency (programming)">concurrency</a>. HDLs, on the other hand, resemble <a href="/wiki/Concurrent_programming" class="mw-redirect" title="Concurrent programming">concurrent programming</a> languages in their ability to model multiple parallel processes (such as <a href="/wiki/Flip-flop_(electronics)" title="Flip-flop (electronics)">flip-flops</a> and <a href="/wiki/Adder_(electronics)" title="Adder (electronics)">adders</a>) that automatically execute independently of one another. Any change to the process's input automatically triggers an update in the simulator's process stack. </p><p>Both programming languages and HDLs are processed by a compiler (often called a synthesizer in the HDL case), but with different goals. For HDLs, "compiling" refers to <a href="/wiki/Logic_synthesis" title="Logic synthesis">logic synthesis</a>; the process of transforming the HDL code listing into a physically realizable gate <a href="/wiki/Netlist" title="Netlist">netlist</a>. The netlist output can take any of many forms: a "simulation" netlist with gate-delay information, a "handoff" netlist for post-synthesis <a href="/wiki/Place_and_route" title="Place and route">placement and routing</a> on a semiconductor die, or a generic industry-standard <a href="/wiki/Electronic_Design_Interchange_Format" class="mw-redirect" title="Electronic Design Interchange Format">Electronic Design Interchange Format</a> (EDIF) (for subsequent conversion to a <a href="/wiki/JEDEC" title="JEDEC">JEDEC</a>-format file). </p><p>On the other hand, a software compiler converts the source-code listing into a <a href="/wiki/Microprocessor" title="Microprocessor">microprocessor</a>-specific object code for execution on the target microprocessor. As HDLs and programming languages borrow concepts and features from each other, the boundary between them is becoming less distinct. However, pure HDLs are unsuitable for general purpose <a href="/wiki/Application_software" title="Application software">application software</a> development,<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Please_clarify" title="Wikipedia:Please clarify"><span title="The reason for this is unclear. (December 2018)">why?</span></a></i>]</sup> just as <a href="/wiki/General-purpose_programming_language" title="General-purpose programming language">general-purpose programming languages</a> are undesirable for modeling hardware. </p><p>Yet as electronic systems grow increasingly complex, and <a href="/wiki/Reconfigurable_system" class="mw-redirect" title="Reconfigurable system">reconfigurable systems</a> become increasingly common, there is growing desire in the industry for a single language that can perform some tasks of both hardware design and software programming. <a href="/wiki/SystemC" title="SystemC">SystemC</a> is an example of such—<a href="/wiki/Embedded_system" title="Embedded system">embedded system</a> hardware can be modeled as non-detailed architectural blocks (<a href="/wiki/Black_box" title="Black box">black boxes</a> with modeled signal inputs and output drivers). The target application is written in C or C++ and natively compiled for the host-development system; as opposed to targeting the embedded CPU, which requires host-simulation of the embedded CPU or an emulated CPU. </p><p>The high level of abstraction of SystemC models is well suited to early <a href="/wiki/Design_space_exploration" title="Design space exploration">architecture exploration</a>, as architectural modifications can be easily evaluated with little concern for signal-level implementation issues. However, the threading model used in SystemC relies on <a href="/wiki/Shared_memory" title="Shared memory">shared memory</a>, causing the language not to handle parallel execution or low-level models well. </p> <div class="mw-heading mw-heading2"><h2 id="High-level_synthesis">High-level synthesis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=9" title="Edit section: High-level synthesis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/High-level_synthesis" title="High-level synthesis">High-level synthesis</a></div> <p>In their level of abstraction, HDLs have been compared to <a href="/wiki/Assembly_language" title="Assembly language">assembly languages</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2014)">citation needed</span></a></i>]</sup> There are attempts to raise the abstraction level of hardware design in order to reduce the complexity of programming in HDLs, creating a sub-field called <i><a href="/wiki/High-level_synthesis" title="High-level synthesis">high-level synthesis</a></i>. </p><p>Companies such as <a href="/wiki/Cadence_Design_Systems" title="Cadence Design Systems">Cadence</a>, <a href="/wiki/Synopsys" title="Synopsys">Synopsys</a> and Agility Design Solutions are promoting <a href="/wiki/SystemC" title="SystemC">SystemC</a> as a way to combine high-level languages with concurrency models to allow faster design cycles for <a href="/wiki/FPGA" class="mw-redirect" title="FPGA">FPGAs</a> than is possible using traditional HDLs. Approaches based on standard <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> or <a href="/wiki/C%2B%2B" title="C++">C++</a> (with libraries or other extensions allowing parallel programming) are found in the <a href="/wiki/Catapult_C" title="Catapult C">Catapult C</a> tools from <a href="/wiki/Mentor_Graphics" title="Mentor Graphics">Mentor Graphics</a>, and the <a href="/wiki/Impulse_C" title="Impulse C">Impulse C</a> tools from Impulse Accelerated Technologies. </p><p>A similar initiative from Intel is the use of Data Parallel C++, related to <a href="/wiki/SYCL" title="SYCL">SYCL</a>, as a high-level synthesis language. </p><p><a rel="nofollow" class="external text" href="https://www.annapmicro.com/">Annapolis Micro Systems</a>, Inc.'s CoreFire Design Suite<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/National_Instruments" title="National Instruments">National Instruments</a> LabVIEW FPGA provide a graphical <a href="/wiki/Dataflow" title="Dataflow">dataflow</a> approach to high-level design entry and languages such as <a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a>, SystemVHDL, and <a href="/wiki/Handel-C" title="Handel-C">Handel-C</a> seek to accomplish the same goal, but are aimed at making existing hardware engineers more productive, rather than making FPGAs more accessible to existing <a href="/wiki/Software_engineer" class="mw-redirect" title="Software engineer">software engineers</a>. </p><p>It is also possible to design hardware modules using <a href="/wiki/MATLAB" title="MATLAB">MATLAB</a> and <a href="/wiki/Simulink" title="Simulink">Simulink</a> using the <a href="/wiki/MathWorks" title="MathWorks">MathWorks</a> HDL Coder tool<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> or DSP Builder for Intel FPGAs<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> or Xilinx System Generator (XSG) from <a href="/wiki/Xilinx" title="Xilinx">Xilinx</a>.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Examples_of_HDLs">Examples of HDLs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=10" title="Edit section: Examples of HDLs"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="HDLs_for_analog_circuit_design">HDLs for analog circuit design</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=11" title="Edit section: HDLs for analog circuit design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="sortable wikitable"> <tbody><tr> <th>Name </th> <th>Description </th></tr> <tr> <td><a href="/w/index.php?title=HDL-A&action=edit&redlink=1" class="new" title="HDL-A (page does not exist)">HDL-A</a> </td> <td>A proprietary analog HDL </td></tr> <tr> <td>SpectreHDL </td> <td>A proprietary analog HDL from <a href="/wiki/Cadence_Design_Systems" title="Cadence Design Systems">Cadence Design Systems</a> for its Spectre circuit simulator </td></tr> <tr> <td><a href="/wiki/Verilog-AMS" title="Verilog-AMS">Verilog-AMS</a> (Verilog for Analog and Mixed-Signal) </td> <td>An <a href="/wiki/Accellera" title="Accellera">Accellera</a> standard extension of IEEE Std 1364 <a href="/wiki/Verilog" title="Verilog">Verilog</a> for analog and mixed-signal simulation </td></tr> <tr> <td><a href="/wiki/VHDL-AMS" title="VHDL-AMS">VHDL-AMS</a> (VHDL with Analog/Mixed-Signal extension) </td> <td>An <a href="/wiki/IEEE_Standards_Association" title="IEEE Standards Association">IEEE standard</a> extension (IEEE Std 1076.1) of <a href="/wiki/VHDL" title="VHDL">VHDL</a> for analog and mixed-signal simulation </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="HDLs_for_digital_circuit_design">HDLs for digital circuit design</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=12" title="Edit section: HDLs for digital circuit design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The two most widely used and well-supported HDL varieties used in industry are <a href="/wiki/Verilog" title="Verilog">Verilog</a> and <a href="/wiki/VHDL" title="VHDL">VHDL</a>. </p> <table class="sortable wikitable"> <tbody><tr> <th>Status </th> <th>Name </th> <th>Host <a href="/wiki/Programming_language" title="Programming language">language</a> </th> <th>Description </th></tr> <tr> <th rowspan="46">In use </th> <td><a href="/wiki/Altera_Hardware_Description_Language" title="Altera Hardware Description Language">Altera Hardware Description Language</a> (AHDL) </td> <td> </td> <td><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> language from <a href="/wiki/Altera" title="Altera">Altera</a> </td></tr> <tr> <td>A Hardware Programming language (<a href="/wiki/AHPL" title="AHPL">AHPL</a>) </td> <td> </td> <td>Used as a tool for teaching </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/amaranth-lang/amaranth">Amaranth</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td> </td></tr> <tr> <td><a href="/wiki/Bluespec" title="Bluespec">Bluespec</a> </td> <td> </td> <td>High-level HDL based on <a href="/wiki/Haskell" title="Haskell">Haskell</a> (not embedded <a href="/wiki/Domain-specific_language" title="Domain-specific language">DSL</a>)<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Bluespec" title="Bluespec">Bluespec</a> <a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a> (BSV) </td> <td> </td> <td>Based on <a href="/wiki/Bluespec" title="Bluespec">Bluespec</a>, with <a href="/wiki/Verilog" title="Verilog">Verilog</a> HDL like syntax, by Bluespec, Inc. </td></tr> <tr> <td>C-to-Verilog </td> <td> </td> <td>Converter from C to Verilog </td></tr> <tr> <td><a href="/wiki/Chisel_(programming_language)" title="Chisel (programming language)">Chisel</a> (Constructing Hardware in a Scala Embedded Language)<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </td> <td><a href="/wiki/Scala_(programming_language)" title="Scala (programming language)">Scala</a> </td> <td>Based on <a href="/wiki/Scala_(programming_language)" title="Scala (programming language)">Scala</a> (embedded <a href="/wiki/Domain-specific_language" title="Domain-specific language">DSL</a>) </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://clash-lang.org/">Clash</a> </td> <td> </td> <td>Functional hardware description language that borrows its syntax and semantics from the functional language <a href="/wiki/Haskell" title="Haskell">Haskell</a> </td></tr> <tr> <td>Common Oriented Language for Architecture of Multi Objects (COLAMO)<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </td> <td> </td> <td><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> language from “Supercomputers and Neurocomputers Research Center” Co Ltd. </td></tr> <tr> <td>Compiler for Universal Programmable Logic (CUPL)<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </td> <td> </td> <td><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> language from Logical Devices, Inc. </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://google.github.io/xls/dslx_reference">DSLX</a> </td> <td> </td> <td><a href="/wiki/Domain-specific_language" title="Domain-specific language">Domain-specific language</a> for XLS toolchain </td></tr> <tr> <td>ESys.net </td> <td> </td> <td><a href="/wiki/.NET" title=".NET">.NET</a> framework written in C# </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://filamenthdl.com/">Filament</a> </td> <td> </td> <td>HDL with a type system inspired by Rust </td></tr> <tr> <td><a href="/wiki/Handel-C" title="Handel-C">Handel-C</a> </td> <td> </td> <td>C-like design language </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/ujamjar/hardcaml">Hardcaml</a> </td> <td><a href="/wiki/OCaml" title="OCaml">OCaml</a> </td> <td>Based on <a href="/wiki/OCaml" title="OCaml">OCaml</a> (embedded DSL)<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>HHDL </td> <td><a href="/wiki/Haskell" title="Haskell">Haskell</a> </td> <td>Based on <a href="/wiki/Haskell" title="Haskell">Haskell</a> (embedded DSL) </td></tr> <tr> <td>Hardware <a href="/wiki/Join-pattern" title="Join-pattern">Join Java</a> (HJJ) </td> <td><a href="/wiki/Join-pattern" title="Join-pattern">Join Java</a> </td> <td>Based on <a href="/wiki/Join-pattern" title="Join-pattern">Join Java</a> </td></tr> <tr> <td>Hardware ML (HML) </td> <td><a href="/wiki/Standard_ML" title="Standard ML">Standard ML</a> </td> <td>Based on <a href="/wiki/Standard_ML" title="Standard ML">Standard ML</a><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>Hydra </td> <td><a href="/wiki/Haskell" title="Haskell">Haskell</a> </td> <td>Based on <a href="/wiki/Haskell" title="Haskell">Haskell</a> </td></tr> <tr> <td><a href="/wiki/Impulse_C" title="Impulse C">Impulse C</a> </td> <td> </td> <td>C-like HDL </td></tr> <tr> <td>Parallel C++ (ParC) </td> <td> </td> <td>kusu extended with HDL style threading and communication for task-parallel programming </td></tr> <tr> <td>JHDL </td> <td><a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java</a> </td> <td>Based on <a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java</a> </td></tr> <tr> <td>Lava </td> <td><a href="/wiki/Haskell" title="Haskell">Haskell</a> </td> <td>Based on <a href="/wiki/Haskell" title="Haskell">Haskell</a> (embedded DSL)<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Lola_(hardware_description_language)" class="mw-redirect" title="Lola (hardware description language)">Lola</a> </td> <td> </td> <td>Simple language used for teaching </td></tr> <tr> <td><a href="/w/index.php?title=M_(HDL)&action=edit&redlink=1" class="new" title="M (HDL) (page does not exist)">M</a> </td> <td> </td> <td>HDL from <a href="/wiki/Mentor_Graphics" title="Mentor Graphics">Mentor Graphics</a> </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/m-labs/migen">Migen</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td> </td></tr> <tr> <td><a href="/wiki/MyHDL" title="MyHDL">MyHDL</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td>Based on <a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> (embedded <a href="/wiki/Domain-specific_language" title="Domain-specific language">DSL</a>) </td></tr> <tr> <td><a href="/wiki/PALASM" title="PALASM">PALASM</a> </td> <td> </td> <td>For <a href="/wiki/Programmable_Array_Logic" title="Programmable Array Logic">Programmable Array Logic</a> (PAL) devices </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/JulianKemmerer/PipelineC">PipelineC</a> </td> <td> </td> <td>C-like hardware description language adding <a href="/wiki/High-level_synthesis" title="High-level synthesis">High-level synthesis</a>-like automatic pipelining as a language construct and compiler feature. </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/pymtl/pymtl3">PyMTL 3 (Mamba)</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td>Based on Python, from Cornell University </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://ucsbarchlab.github.io/PyRTL/">PyRTL</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td>Based on Python, from University of California, Santa Barbara </td></tr> <tr> <td>Riverside Optimizing Compiler for Configurable Computing (ROCCC) </td> <td> </td> <td>Free and open-source C to HDL tool </td></tr> <tr> <td>RHDL </td> <td><a href="/wiki/Ruby_(programming_language)" title="Ruby (programming language)">Ruby</a> </td> <td>Based on the <a href="/wiki/Ruby_(programming_language)" title="Ruby (programming language)">Ruby programming language</a> </td></tr> <tr> <td>Rapid Open Hardware Development (ROHD)<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </td> <td><a href="/wiki/Dart_(programming_language)" title="Dart (programming language)">Dart</a> </td> <td><a href="/wiki/Software_framework" title="Software framework">Framework</a> for hardware design and verification, written in <a href="/wiki/Dart_(programming_language)" title="Dart (programming language)">Dart</a> </td></tr> <tr> <td><a href="/wiki/Ruby_(hardware_description_language)" title="Ruby (hardware description language)">Ruby (hardware description language)</a> </td> <td> </td> <td> </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/sylefeb/Silice">Silice</a> </td> <td> </td> <td>HDL that simplifies designing hardware algorithms with parallelism and pipelines </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://spade-lang.org/">Spade</a> </td> <td> </td> <td>HDL inspired by modern software languages like Rust </td></tr> <tr> <td><a href="/wiki/SystemC" title="SystemC">SystemC</a> </td> <td> </td> <td>Standardized class of <a href="/wiki/C%2B%2B" title="C++">C++</a> libraries for high-level behavioral and transaction modeling of <a href="/wiki/Digital_hardware" class="mw-redirect" title="Digital hardware">digital hardware</a> at a high level of abstraction, i.e., system-level </td></tr> <tr> <td><a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a> </td> <td> </td> <td>Superset of Verilog, with enhancements to address system-level design and verification </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/SpinalHDL/SpinalHDL">SpinalHDL</a> </td> <td><a href="/wiki/Scala_(programming_language)" title="Scala (programming language)">Scala</a> </td> <td>Based on Scala (embedded DSL) </td></tr> <tr> <td>SystemTCL </td> <td> </td> <td>SDL based on Tcl </td></tr> <tr> <td>Templated HDL inspired by C++ (THDL++) </td> <td> </td> <td>Extension of VHDL with inheritance, advanced templates and policy classes </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/frwang96/verik">Verik</a> </td> <td> </td> <td><a href="/wiki/Kotlin_(programming_language)" title="Kotlin (programming language)">Kotlin</a> reinterpreted with the semantics of an HDL; transpiled to <a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a> </td></tr> <tr> <td>Transaction-Level Verilog (TL-Verilog)<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </td> <td> </td> <td>Extension of Verilog/<a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a> with constructs for <a href="/wiki/Pipeline_(computing)" title="Pipeline (computing)">pipelines</a> and <a href="/wiki/Transactional_memory" title="Transactional memory">transactions</a>. </td></tr> <tr> <td><a href="/wiki/Verilog" title="Verilog">Verilog</a> </td> <td> </td> <td>One of the most widely used and well-supported HDLs </td></tr> <tr> <td><a href="/wiki/VHDL" title="VHDL">VHDL</a> (<a href="/wiki/VHSIC" class="mw-redirect" title="VHSIC">VHSIC</a> HDL) </td> <td> </td> <td>One of the most widely used and well-supported HDLs </td></tr> <tr> <th rowspan="7">No longer in common use </th> <td><a href="/wiki/Advanced_Boolean_Expression_Language" title="Advanced Boolean Expression Language">Advanced Boolean Expression Language</a> (ABEL) </td> <td> </td> <td>Obsolete HDL made by <a href="/wiki/Data_I/O_Corporation" class="mw-redirect" title="Data I/O Corporation">Data I/O Corporation</a> in 1983 </td></tr> <tr> <td>Confluence </td> <td> </td> <td>Functional HDL, discontinued </td></tr> <tr> <td>CoWareC </td> <td> </td> <td>C-based HDL by <a href="/wiki/CoWare" class="mw-redirect" title="CoWare">CoWare</a>; discontinued in favor of SystemC </td></tr> <tr> <td><a href="/wiki/ELLA_(programming_language)" title="ELLA (programming language)">ELLA</a> </td> <td> </td> <td>No longer in common use </td></tr> <tr> <td>ISPS </td> <td> </td> <td>Original HDL from CMU; no longer in common use </td></tr> <tr> <td>KAiserslautern Register Language (KARL)<sup id="cite_ref-Hartenstein93_9-1" class="reference"><a href="#cite_note-Hartenstein93-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </td> <td> </td> <td><a href="/wiki/Pascal_(programming_language)" title="Pascal (programming language)">Pascal</a>-like hardware description language; no longer in common use </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://gitlab.com/nmigen/nmigen">nMigen</a> </td> <td><a href="/wiki/Python_(programming_language)" title="Python (programming language)">Python</a> </td> <td>Predecessor to Amaranth </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="HDLs_for_printed_circuit_board_design">HDLs for printed circuit board design</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=13" title="Edit section: HDLs for printed circuit board design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Several projects exist for defining <a href="/wiki/Printed_circuit_board" title="Printed circuit board">printed circuit board</a> connectivity using language based, textual-entry methods. Among these, new approaches have emerged that focus on enhancing readability, reusability, and validation. These modern methodologies employ open-source design languages specifically tailored for electronics, adopting declarative markup to specify what circuits should achieve. This shift integrates software development principles into hardware design, streamlining the process and emphasizing automation, reuse, and validation. </p> <table class="sortable wikitable"> <tbody><tr> <th>Name </th> <th>Description </th></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/atopile/atopile">atopile</a> </td> <td>An open-source language and toolchain to describe electronic circuit boards with code. </td></tr> <tr> <td><a href="/w/index.php?title=PHDL&action=edit&redlink=1" class="new" title="PHDL (page does not exist)">PHDL</a> (PCB HDL) </td> <td>A free and open source HDL for defining printed circuit board connectivity. </td></tr> <tr> <td>EDAsolver </td> <td>An HDL for solving schematic designs based on constraints. </td></tr> <tr> <td><a rel="nofollow" class="external text" href="https://github.com/xesscorp/skidl">SKiDL</a> </td> <td>Open source Python module to design electronic circuits. </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=14" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Bluespec" title="Bluespec">Bluespec</a></li> <li><a href="/wiki/C_to_HDL" title="C to HDL">C to HDL</a></li> <li><a href="/wiki/Flow_to_HDL" title="Flow to HDL">Flow to HDL</a></li> <li><a href="/wiki/Gezel" title="Gezel">Gezel</a></li> <li><a href="/wiki/Hardware_verification_language" title="Hardware verification language">Hardware verification language</a></li> <li><a href="/wiki/Modeling_language" title="Modeling language">Modeling language</a></li> <li><a href="/wiki/Property_Specification_Language" title="Property Specification Language">Property Specification Language</a></li> <li><a href="/wiki/Rosetta-lang" title="Rosetta-lang">Rosetta-lang</a></li> <li><a href="/wiki/Specification_language" title="Specification language">Specification language</a></li> <li><a href="/wiki/SystemC" title="SystemC">SystemC</a></li> <li><a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a></li></ul></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=15" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFCiletti2011" class="citation book cs1">Ciletti, Michael D. (2011). <i>Advanced Digital Design with Verilog HDL</i> (2nd ed.). Prentice Hall. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780136019282" title="Special:BookSources/9780136019282"><bdi>9780136019282</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Advanced+Digital+Design+with+Verilog+HDL&rft.edition=2nd&rft.pub=Prentice+Hall&rft.date=2011&rft.isbn=9780136019282&rft.aulast=Ciletti&rft.aufirst=Michael+D.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">Barbacci, M. "A comparison of register transfer languages for describing computers and digital systems," Carnegie-Mellon Univ., Dept. of Computer Science, March 1973</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBellNewell1971" class="citation book cs1">Bell, C. G.; Newell, A. (1971). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/computerstructur00bell"><i>Computer Structures: Readings and Examples</i></a></span>. McGraw-Hill. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-07-004357-4" title="Special:BookSources/0-07-004357-4"><bdi>0-07-004357-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Computer+Structures%3A+Readings+and+Examples&rft.pub=McGraw-Hill&rft.date=1971&rft.isbn=0-07-004357-4&rft.aulast=Bell&rft.aufirst=C.+G.&rft.au=Newell%2C+A.&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fcomputerstructur00bell&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFReilly2003" class="citation book cs1">Reilly, E.D. (2003). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/milestonesincomp0000reil"><i>Milestones in computer science and information technology</i></a></span>. Greenwood Press. p. <a rel="nofollow" class="external text" href="https://archive.org/details/milestonesincomp0000reil/page/183">183</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-57356-521-0" title="Special:BookSources/1-57356-521-0"><bdi>1-57356-521-0</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Milestones+in+computer+science+and+information+technology&rft.pages=183&rft.pub=Greenwood+Press&rft.date=2003&rft.isbn=1-57356-521-0&rft.aulast=Reilly&rft.aufirst=E.D.&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fmilestonesincomp0000reil&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBellGrasonNewell1972" class="citation book cs1">Bell, C.G.; Grason, J.; Newell, A. (1972). <i>Designing Computers and Digital Systems</i>. Digital Press. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/72-89566">72-89566</a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/440245727">440245727</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Designing+Computers+and+Digital+Systems&rft.pub=Digital+Press&rft.date=1972&rft_id=info%3Aoclcnum%2F440245727&rft_id=info%3Alccn%2F72-89566&rft.aulast=Bell&rft.aufirst=C.G.&rft.au=Grason%2C+J.&rft.au=Newell%2C+A.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBarbacci1976" class="citation report cs1">Barbacci, M.C. (1976). The Symbolic Manipulation of Computer Descriptions: ISPL Compiler and Simulator (Report). Department of Computer Science, Carnegie-Mellon University. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1184%2FR1%2F6610790.v1">10.1184/R1/6610790.v1</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=report&rft.btitle=The+Symbolic+Manipulation+of+Computer+Descriptions%3A+ISPL+Compiler+and+Simulator&rft.pub=Department+of+Computer+Science%2C+Carnegie-Mellon+University&rft.date=1976&rft_id=info%3Adoi%2F10.1184%2FR1%2F6610790.v1&rft.aulast=Barbacci&rft.aufirst=M.C.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBarbacciBarnesCattellSiewiorek1977" class="citation report cs1">Barbacci, M.C.; Barnes, G.E.; Cattell, R.G.G.; Siewiorek, D.P. (1977). The ISPS Computer Description Language (Report). Department of Computer Science, Carnegie-Mellon University. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1184%2FR1%2F6610637.v1">10.1184/R1/6610637.v1</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=report&rft.btitle=The+ISPS+Computer+Description+Language&rft.pub=Department+of+Computer+Science%2C+Carnegie-Mellon+University&rft.date=1977&rft_id=info%3Adoi%2F10.1184%2FR1%2F6610637.v1&rft.aulast=Barbacci&rft.aufirst=M.C.&rft.au=Barnes%2C+G.E.&rft.au=Cattell%2C+R.G.G.&rft.au=Siewiorek%2C+D.P.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGirardi,_G.Hartenstein,_R.1983" class="citation report cs1">Girardi, G.; Hartenstein, R. (1983). ABL specification (Report). <a href="/wiki/CSELT" title="CSELT">CSELT</a> and <a href="/wiki/University_of_Kaiserslautern" class="mw-redirect" title="University of Kaiserslautern">University of Kaiserslautern</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=report&rft.btitle=ABL+specification&rft.pub=CSELT+and+University+of+Kaiserslautern&rft.date=1983&rft.au=Girardi%2C+G.&rft.au=Hartenstein%2C+R.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-Hartenstein93-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-Hartenstein93_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Hartenstein93_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHartenstein2012" class="citation cs2">Hartenstein, Reiner W. (2012) [1993], <a rel="nofollow" class="external text" href="https://books.google.com/books?id=DBrtCAAAQBAJ&pg=PA447">"KARL and ABL"</a>, in Mermet, J. (ed.), <i>Fundamentals and Standards in Hardware Description Languages</i>, NATO Science Series E, vol. 249, Springer, pp. 447–, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9789401119146" title="Special:BookSources/9789401119146"><bdi>9789401119146</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=KARL+and+ABL&rft.btitle=Fundamentals+and+Standards+in+Hardware+Description+Languages&rft.series=NATO+Science+Series+E&rft.pages=447-&rft.pub=Springer&rft.date=2012&rft.isbn=9789401119146&rft.aulast=Hartenstein&rft.aufirst=Reiner+W.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DDBrtCAAAQBAJ%26pg%3DPA447&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBarbacciGroutLindstromMaloney1984" class="citation report cs1">Barbacci, M.C.; Grout, S.; Lindstrom, G.; Maloney, M.P. (1984). Ada as a hardware description language : an initial report (Report). Department of Computer Science, Carnegie-Mellon University. <a href="/wiki/CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.938.8003">10.1.1.938.8003</a></span>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1184%2FR1%2F6602984.v1">10.1184/R1/6602984.v1</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=report&rft.btitle=Ada+as+a+hardware+description+language+%3A+an+initial+report&rft.pub=Department+of+Computer+Science%2C+Carnegie-Mellon+University&rft.date=1984&rft_id=https%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fsummary%3Fdoi%3D10.1.1.938.8003%23id-name%3DCiteSeerX&rft_id=info%3Adoi%2F10.1184%2FR1%2F6602984.v1&rft.aulast=Barbacci&rft.aufirst=M.C.&rft.au=Grout%2C+S.&rft.au=Lindstrom%2C+G.&rft.au=Maloney%2C+M.P.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www.annapmicro.com/products/corefire-next/">"VHDL-Based FPGA Programming Application Software Tool"</a>. <i>Annapolis Micro Systems, Inc</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-12-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Annapolis+Micro+Systems%2C+Inc.&rft.atitle=VHDL-Based+FPGA+Programming+Application+Software+Tool&rft_id=https%3A%2F%2Fwww.annapmicro.com%2Fproducts%2Fcorefire-next%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.mathworks.com/products/hdl-coder/">"VHDL code - HDL Coder - MATLAB & Simulink"</a>. Mathworks.com. 2011-04-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-08-11</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=VHDL+code+-+HDL+Coder+-+MATLAB+%26+Simulink&rft.pub=Mathworks.com&rft.date=2011-04-30&rft_id=http%3A%2F%2Fwww.mathworks.com%2Fproducts%2Fhdl-coder%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.intel.com/content/www/us/en/software/programmable/quartus-prime/dsp-builder.html">"Digital Signal Processing (DSP) Builder - Intel® FPGAs"</a>. <i>Intel</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2021-09-20</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Intel&rft.atitle=Digital+Signal+Processing+%28DSP%29+Builder+-+Intel%C2%AE+FPGAs&rft_id=https%3A%2F%2Fwww.intel.com%2Fcontent%2Fwww%2Fus%2Fen%2Fsoftware%2Fprogrammable%2Fquartus-prime%2Fdsp-builder.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120712224415/http://www.xilinx.com/tools/sysgen.htm">"System Generator for DSP"</a>. Xilinx.com. Archived from <a rel="nofollow" class="external text" href="http://www.xilinx.com/tools/sysgen.htm">the original</a> on 2012-07-12<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-08-11</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=System+Generator+for+DSP&rft.pub=Xilinx.com&rft_id=http%3A%2F%2Fwww.xilinx.com%2Ftools%2Fsysgen.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><i>A History of Haskell: being lazy with class</i> §12.4.2</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.chisel-lang.org/">"Chisel/FIRRTL Hardware Compiler Framework"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Chisel%2FFIRRTL+Hardware+Compiler+Framework&rft_id=https%3A%2F%2Fwww.chisel-lang.org%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://colamo.parallel.ru/">COLAMO</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged July 2024">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://superevm.ru/index.php?page=higher-level-language-colamo">"Higher-level language COLAMO – НИЦ супер-ЭВМ и нейрокомпьютеров"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Higher-level+language+COLAMO+%E2%80%93+%D0%9D%D0%98%D0%A6+%D1%81%D1%83%D0%BF%D0%B5%D1%80-%D0%AD%D0%92%D0%9C+%D0%B8+%D0%BD%D0%B5%D0%B9%D1%80%D0%BE%D0%BA%D0%BE%D0%BC%D0%BF%D1%8C%D1%8E%D1%82%D0%B5%D1%80%D0%BE%D0%B2&rft_id=http%3A%2F%2Fsuperevm.ru%2Findex.php%3Fpage%3Dhigher-level-language-colamo&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFEurichRoth1990" class="citation journal cs1">Eurich, J.P.; Roth, G. (1990). "EDIF grows up". <i>IEEE Spectrum</i>. <b>27</b> (11): 68–72. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2F6.62219">10.1109/6.62219</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:381119">381119</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=IEEE+Spectrum&rft.atitle=EDIF+grows+up&rft.volume=27&rft.issue=11&rft.pages=68-72&rft.date=1990&rft_id=info%3Adoi%2F10.1109%2F6.62219&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A381119%23id-name%3DS2CID&rft.aulast=Eurich&rft.aufirst=J.P.&rft.au=Roth%2C+G.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.ujamjar.com/hardcaml/">Hardcaml</a></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLiLeeser1995" class="citation book cs1">Li, Yanbing; Leeser, M. (1995). "HML: An innovative hardware description language and its translation to VHDL". <i>Proceedings of ASP-DAC'95/CHDL'95/VLSI'95 with EDA Technofair</i>. pp. 691–696. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FASPDAC.1995.486388">10.1109/ASPDAC.1995.486388</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/4-930813-67-0" title="Special:BookSources/4-930813-67-0"><bdi>4-930813-67-0</bdi></a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:14198160">14198160</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=HML%3A+An+innovative+hardware+description+language+and+its+translation+to+VHDL&rft.btitle=Proceedings+of+ASP-DAC%2795%2FCHDL%2795%2FVLSI%2795+with+EDA+Technofair&rft.pages=691-696&rft.date=1995&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A14198160%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1109%2FASPDAC.1995.486388&rft.isbn=4-930813-67-0&rft.aulast=Li&rft.aufirst=Yanbing&rft.au=Leeser%2C+M.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://hackage.haskell.org/package/chalmers-lava2000">Chalmers Lava</a></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://hackage.haskell.org/package/xilinx-lava">Xilinx Lava</a></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://hackage.haskell.org/package/kansas-lava">Kansas Lava</a></span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://hackage.haskell.org/package/york-lava">York Lava</a></span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/intel/rohd">"Rapid Open Hardware Development (ROHD) Framework"</a>. <i><a href="/wiki/GitHub" title="GitHub">GitHub</a></i>. 17 November 2021.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=Rapid+Open+Hardware+Development+%28ROHD%29+Framework&rft.date=2021-11-17&rft_id=https%3A%2F%2Fgithub.com%2Fintel%2Frohd&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHardware+description+language" class="Z3988"></span></span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.tl-x.org">TL-Verilog</a></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hardware_description_language&action=edit&section=16" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:Hardware_description_languages" class="extiw" title="commons:Category:Hardware description languages">Hardware description languages</a></span>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="http://hct.sourceforge.net/">HCT</a> - The HDL Complexity tool, used to determine design complexity.</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Types_of_computer_language" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Computer_language" title="Template:Computer language"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Computer_language" title="Template talk:Computer language"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Computer_language" title="Special:EditPage/Template:Computer language"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Types_of_computer_language" style="font-size:114%;margin:0 4em">Types of <a href="/wiki/Computer_language" title="Computer language">computer language</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Types</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Architecture_description_language" title="Architecture description language">Architecture description</a></li> <li><a href="/wiki/Data_exchange#Data_exchange_languages" title="Data exchange">Data exchange</a></li> <li><a class="mw-selflink selflink">Hardware description</a></li> <li><a href="/wiki/Knowledge_representation_language" class="mw-redirect" title="Knowledge representation language">Knowledge representation</a></li> <li><a href="/wiki/Markup_language" title="Markup language">Markup</a></li> <li><a href="/wiki/Modeling_language" title="Modeling language">Modeling</a></li> <li><a href="/wiki/Programming_language" title="Programming language">Programming language</a></li> <li><a href="/wiki/Query_language" title="Query language">Query</a></li> <li><a href="/wiki/Shading_language" title="Shading language">Shading</a></li> <li><a href="/wiki/Specification_language" title="Specification language">Specification</a></li> <li><a href="/wiki/Style_sheet_language" title="Style sheet language">Stylesheet</a></li> <li><a href="/wiki/Transformation_language" title="Transformation language">Transformation</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">See also</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Category:Lists_of_computer_languages" title="Category:Lists of computer languages">Category:Lists of computer languages</a></li> <li><a href="/wiki/Category:Lists_of_programming_languages" title="Category:Lists of programming languages">Category:Lists of programming languages</a></li> <li><a href="/wiki/List_of_programming_languages_by_type" title="List of programming languages by type">List of programming languages by type</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Programmable_logic" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Programmable_logic" title="Template:Programmable logic"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Programmable_logic" title="Template talk:Programmable logic"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Programmable_logic" title="Special:EditPage/Template:Programmable logic"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Programmable_logic" style="font-size:114%;margin:0 4em"><a href="/wiki/Programmable_logic_device" title="Programmable logic device">Programmable logic</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">ASIC</a></li> <li><a href="/wiki/System_on_a_chip" title="System on a chip">SoC</a></li> <li><a href="/wiki/Field-programmable_gate_array" title="Field-programmable gate array">FPGA</a> <ul><li><a href="/wiki/Logic_block" title="Logic block">Logic block</a></li></ul></li> <li><a href="/wiki/Complex_programmable_logic_device" title="Complex programmable logic device">CPLD</a></li> <li><a href="/wiki/Programmable_logic_device#EPLDs" title="Programmable logic device">EPLD</a></li> <li><a href="/wiki/Programmable_logic_array" title="Programmable logic array">PLA</a></li> <li><a href="/wiki/Programmable_Array_Logic" title="Programmable Array Logic">PAL</a></li> <li><a href="/wiki/Generic_array_logic" class="mw-redirect" title="Generic array logic">GAL</a></li> <li><a href="/wiki/Cypress_PSoC" title="Cypress PSoC">PSoC</a></li> <li><a href="/wiki/Reconfigurable_computing" title="Reconfigurable computing">Reconfigurable computing</a> <ul><li><a href="/wiki/Xputer" title="Xputer">Xputer</a></li></ul></li> <li><a href="/wiki/Soft_microprocessor" title="Soft microprocessor">Soft microprocessor</a></li> <li><a href="/wiki/Circuit_underutilization" title="Circuit underutilization">Circuit underutilization</a></li> <li><a href="/wiki/High-level_synthesis" title="High-level synthesis">High-level synthesis</a></li> <li><a href="/wiki/Hardware_acceleration" title="Hardware acceleration">Hardware acceleration</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a class="mw-selflink selflink">Languages</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Verilog" title="Verilog">Verilog</a> <ul><li><a href="/wiki/Verilog-A" title="Verilog-A">A</a></li> <li><a href="/wiki/Verilog-AMS" title="Verilog-AMS">AMS</a></li></ul></li> <li><a href="/wiki/VHDL" title="VHDL">VHDL</a> <ul><li><a href="/wiki/VHDL-AMS" title="VHDL-AMS">AMS</a></li> <li><a href="/wiki/VHDL-VITAL" title="VHDL-VITAL">VITAL</a></li></ul></li> <li><a href="/wiki/SystemVerilog" title="SystemVerilog">SystemVerilog</a> <ul><li><a href="/wiki/SystemVerilog_DPI" title="SystemVerilog DPI">DPI</a></li></ul></li> <li><a href="/wiki/SystemC" title="SystemC">SystemC</a></li> <li><a href="/wiki/Altera_Hardware_Description_Language" title="Altera Hardware Description Language">AHDL</a></li> <li><a href="/wiki/Handel-C" title="Handel-C">Handel-C</a></li> <li><a href="/wiki/Lola_(computing)" title="Lola (computing)">Lola</a></li> <li><a href="/wiki/Property_Specification_Language" title="Property Specification Language">PSL</a></li> <li><a href="/wiki/Unified_Power_Format" title="Unified Power Format">UPF</a></li> <li><a href="/wiki/PALASM" title="PALASM">PALASM</a></li> <li><a href="/wiki/Advanced_Boolean_Expression_Language" title="Advanced Boolean Expression Language">ABEL</a></li> <li><a href="/wiki/Programmable_Array_Logic#CUPL" title="Programmable Array Logic">CUPL</a></li> <li><a href="/wiki/C_to_HDL" title="C to HDL">C to HDL</a></li> <li><a href="/wiki/Flow_to_HDL" title="Flow to HDL">Flow to HDL</a></li> <li><a href="/wiki/MyHDL" title="MyHDL">MyHDL</a></li> <li><a href="/wiki/ELLA_(programming_language)" title="ELLA (programming language)">ELLA</a></li> <li><a href="/wiki/Chisel_(programming_language)" title="Chisel (programming language)">Chisel</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Companies</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Accellera" title="Accellera">Accellera</a></li> <li><a href="/wiki/Achronix" title="Achronix">Achronix</a></li> <li><a href="/wiki/AMD" title="AMD">AMD</a></li> <li><a href="/wiki/Aldec" title="Aldec">Aldec</a></li> <li><a href="/wiki/Arm_Holdings" title="Arm Holdings">Arm</a></li> <li><a href="/wiki/Cadence_Design_Systems" title="Cadence Design Systems">Cadence</a></li> <li><a href="/wiki/Infineon_Technologies" title="Infineon Technologies">Infineon</a></li> <li><a href="/wiki/Intel" title="Intel">Intel</a></li> <li><a href="/wiki/Lattice_Semiconductor" title="Lattice Semiconductor">Lattice</a></li> <li><a href="/wiki/Microchip_Technology" title="Microchip Technology">Microchip Technology</a></li> <li><a href="/wiki/NXP_Semiconductors" title="NXP Semiconductors">NXP</a></li> <li><a href="/wiki/Siemens" title="Siemens">Siemens</a></li> <li><a href="/wiki/Synopsys" title="Synopsys">Synopsys</a></li> <li><a href="/wiki/Texas_Instruments" title="Texas Instruments">Texas Instruments</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Products</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Hardware</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ICE_(FPGA)" title="ICE (FPGA)">iCE</a></li> <li><a href="/wiki/Stratix" title="Stratix">Stratix</a></li> <li><a href="/wiki/Virtex_(FPGA)" title="Virtex (FPGA)">Virtex</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Software</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Intel_Quartus_Prime" title="Intel Quartus Prime">Intel Quartus Prime</a></li> <li><a href="/wiki/Xilinx_ISE" title="Xilinx ISE">Xilinx ISE</a></li> <li><a href="/wiki/Vivado" title="Vivado">Vivado</a></li> <li><a href="/wiki/ModelSim" title="ModelSim">ModelSim</a></li> <li><a href="/wiki/Verilog-to-Routing" title="Verilog-to-Routing">VTR</a></li> <li><a href="/wiki/List_of_HDL_simulators" title="List of HDL simulators">Simulators</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Intellectual_property" title="Intellectual property">Intellectual<br />property</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Proprietary_hardware" title="Proprietary hardware">Proprietary</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ARC_(processor)" title="ARC (processor)">ARC</a></li> <li><a href="/wiki/ARM_Cortex-M" title="ARM Cortex-M">ARM Cortex-M</a></li> <li><a href="/wiki/LEON" title="LEON">LEON</a></li> <li><a href="/wiki/LatticeMico8" title="LatticeMico8">LatticeMico8</a></li> <li><a href="/wiki/MicroBlaze" title="MicroBlaze">MicroBlaze</a></li> <li><a href="/wiki/PicoBlaze" title="PicoBlaze">PicoBlaze</a></li> <li><a href="/wiki/Nios_embedded_processor" title="Nios embedded processor">Nios</a></li> <li><a href="/wiki/Nios_II" title="Nios II">Nios II</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Open-source_hardware" title="Open-source hardware">Open-source</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Java_Optimized_Processor" title="Java Optimized Processor">JOP</a></li> <li><a href="/wiki/LatticeMico32" title="LatticeMico32">LatticeMico32</a></li> <li><a href="/wiki/OpenCores" title="OpenCores">OpenCores</a></li> <li><a href="/wiki/OpenRISC" title="OpenRISC">OpenRISC</a> <ul><li><a href="/wiki/OpenRISC_1200" title="OpenRISC 1200">1200</a></li></ul></li> <li><a href="/wiki/Power_ISA" title="Power ISA">Power ISA</a> <ul><li><a href="/wiki/Libre-SOC" title="Libre-SOC">Libre-SOC</a></li> <li><a href="/wiki/OpenPOWER_Microwatt" title="OpenPOWER Microwatt">Microwatt</a></li></ul></li> <li><a href="/wiki/RISC-V" title="RISC-V">RISC-V</a></li> <li><a href="/wiki/Zet_(hardware)" title="Zet (hardware)">Zet</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Digital_electronics" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Digital_electronics" title="Template:Digital electronics"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Digital_electronics" title="Template talk:Digital electronics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Digital_electronics" title="Special:EditPage/Template:Digital electronics"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Digital_electronics" style="font-size:114%;margin:0 4em"><a href="/wiki/Digital_electronics" title="Digital electronics">Digital electronics</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="/wiki/Electronic_component" title="Electronic component">Components</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Transistor" title="Transistor">Transistor</a></li> <li><a href="/wiki/Resistor" title="Resistor">Resistor</a></li> <li><a href="/wiki/Inductor" title="Inductor">Inductor</a></li> <li><a href="/wiki/Capacitor" title="Capacitor">Capacitor</a></li> <li><a href="/wiki/Printed_electronics" title="Printed electronics">Printed electronics</a></li> <li><a href="/wiki/Printed_circuit_board" title="Printed circuit board">Printed circuit board</a></li> <li><a href="/wiki/Electronic_circuit" title="Electronic circuit">Electronic circuit</a></li> <li><a href="/wiki/Flip-flop_(electronics)" title="Flip-flop (electronics)">Flip-flop</a></li> <li><a href="/wiki/Memory_cell_(computing)" title="Memory cell (computing)">Memory cell</a></li> <li><a href="/wiki/Combinational_logic" title="Combinational logic">Combinational logic</a></li> <li><a href="/wiki/Sequential_logic" title="Sequential logic">Sequential logic</a></li> <li><a href="/wiki/Logic_gate" title="Logic gate">Logic gate</a></li> <li><a href="/wiki/Boolean_circuit" title="Boolean circuit">Boolean circuit</a></li> <li><a href="/wiki/Integrated_circuit" title="Integrated circuit">Integrated circuit</a> (IC)</li> <li><a href="/wiki/Hybrid_integrated_circuit" title="Hybrid integrated circuit">Hybrid integrated circuit</a> (HIC)</li> <li><a href="/wiki/Mixed-signal_integrated_circuit" title="Mixed-signal integrated circuit">Mixed-signal integrated circuit</a></li> <li><a href="/wiki/Three-dimensional_integrated_circuit" title="Three-dimensional integrated circuit">Three-dimensional integrated circuit</a> (3D IC)</li> <li><a href="/wiki/Emitter-coupled_logic" title="Emitter-coupled logic">Emitter-coupled logic</a> (ECL)</li> <li><a href="/wiki/Erasable_programmable_logic_device" class="mw-redirect" title="Erasable programmable logic device">Erasable programmable logic device</a> (EPLD)</li> <li><a href="/wiki/Macrocell_array" title="Macrocell array">Macrocell array</a></li> <li><a href="/wiki/Programmable_logic_array" title="Programmable logic array">Programmable logic array</a> (PLA)</li> <li><a href="/wiki/Programmable_logic_device" title="Programmable logic device">Programmable logic device</a> (PLD)</li> <li><a href="/wiki/Programmable_Array_Logic" title="Programmable Array Logic">Programmable Array Logic</a> (PAL)</li> <li><a href="/wiki/Generic_Array_Logic" title="Generic Array Logic">Generic Array Logic</a> (GAL)</li> <li><a href="/wiki/Complex_programmable_logic_device" title="Complex programmable logic device">Complex programmable logic device</a> (CPLD)</li> <li><a href="/wiki/Field-programmable_gate_array" title="Field-programmable gate array">Field-programmable gate array</a> (FPGA)</li> <li><a href="/wiki/Field-programmable_object_array" title="Field-programmable object array">Field-programmable object array</a> (FPOA)</li> <li><a href="/wiki/Application-specific_integrated_circuit" title="Application-specific integrated circuit">Application-specific integrated circuit</a> (ASIC)</li> <li><a href="/wiki/Tensor_Processing_Unit" title="Tensor Processing Unit">Tensor Processing Unit</a> (TPU)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">Theory</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Digital_signal" title="Digital signal">Digital signal</a></li> <li><a href="/wiki/Boolean_algebra" title="Boolean algebra">Boolean algebra</a></li> <li><a href="/wiki/Logic_synthesis" title="Logic synthesis">Logic synthesis</a></li> <li><a href="/wiki/Logic_in_computer_science" title="Logic in computer science">Logic in computer science</a></li> <li><a href="/wiki/Computer_architecture" title="Computer architecture">Computer architecture</a></li> <li><a href="/wiki/Digital_signal_(signal_processing)" title="Digital signal (signal processing)">Digital signal</a> <ul><li><a href="/wiki/Digital_signal_processing" title="Digital signal processing">Digital signal processing</a></li></ul></li> <li><a href="/wiki/Circuit_minimization_for_Boolean_functions" class="mw-redirect" title="Circuit minimization for Boolean functions">Circuit minimization</a></li> <li><a href="/wiki/Switching_circuit_theory" title="Switching circuit theory">Switching circuit theory</a></li> <li><a href="/wiki/Gate_equivalent" title="Gate equivalent">Gate equivalent</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="/wiki/Electronics_design" class="mw-redirect" title="Electronics design">Design</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Logic_synthesis" title="Logic synthesis">Logic synthesis</a></li> <li><a href="/wiki/Place_and_route" title="Place and route">Place and route</a> <ul><li><a href="/wiki/Placement_(electronic_design_automation)" title="Placement (electronic design automation)">Placement</a></li> <li><a href="/wiki/Routing_(electronic_design_automation)" title="Routing (electronic design automation)">Routing</a></li></ul></li> <li><a href="/wiki/Transaction-level_modeling" title="Transaction-level modeling">Transaction-level modeling</a></li> <li><a href="/wiki/Register-transfer_level" title="Register-transfer level">Register-transfer level</a> <ul><li><a class="mw-selflink selflink">Hardware description language</a></li> <li><a href="/wiki/High-level_synthesis" title="High-level synthesis">High-level synthesis</a></li></ul></li> <li><a href="/wiki/Formal_equivalence_checking" title="Formal equivalence checking">Formal equivalence checking</a></li> <li><a href="/wiki/Synchronous_circuit" title="Synchronous circuit">Synchronous logic</a></li> <li><a href="/wiki/Asynchronous_circuit" title="Asynchronous circuit">Asynchronous logic</a></li> <li><a href="/wiki/Finite-state_machine" title="Finite-state machine">Finite-state machine</a> <ul><li><a href="/wiki/Hierarchical_state_machine" class="mw-redirect" title="Hierarchical state machine">Hierarchical state machine</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">Applications</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Computer_hardware" title="Computer hardware">Computer hardware</a> <ul><li><a href="/wiki/Hardware_acceleration" title="Hardware acceleration">Hardware acceleration</a></li></ul></li> <li><a href="/wiki/Digital_audio" title="Digital audio">Digital audio</a> <ul><li><a href="/wiki/Digital_radio" title="Digital radio">radio</a></li></ul></li> <li><a href="/wiki/Digital_photography" title="Digital photography">Digital photography</a></li> <li><a href="/wiki/Telephony#Digital_telephony" title="Telephony">Digital telephone</a></li> <li><a href="/wiki/Digital_video" title="Digital video">Digital video</a> <ul><li><a href="/wiki/Digital_cinematography" title="Digital cinematography">cinematography</a></li> <li><a href="/wiki/Digital_television" title="Digital television">television</a></li></ul></li> <li><a href="/wiki/Electronic_literature" title="Electronic literature">Electronic literature</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">Design issues</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Metastability_(electronics)" title="Metastability (electronics)">Metastability</a></li> <li><a href="/wiki/Runt_pulse" title="Runt pulse">Runt pulse</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r1038841319">.mw-parser-output .tooltip-dotted{border-bottom:1px dotted;cursor:help}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q173341#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q173341#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="font-size:114%;margin:0 4em"><a href="/wiki/Help:Authority_control" title="Help:Authority control">Authority control databases</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q173341#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">International</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Computer hardware description languages"><a rel="nofollow" class="external text" href="http://id.worldcat.org/fast/872153/">FAST</a></span></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">National</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4159102-1">Germany</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Computer hardware description languages"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/sh87005550">United States</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Langages de description de matériel informatique"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb122900715">France</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Langages de description de matériel informatique"><a rel="nofollow" class="external text" href="https://data.bnf.fr/ark:/12148/cb122900715">BnF data</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="ハードウェア記述言語"><a rel="nofollow" class="external text" href="https://id.ndl.go.jp/auth/ndlna/01183213">Japan</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Lenguajes de descripción del soporte físico"><a rel="nofollow" class="external text" href="http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?action=display&authority_id=XX539303">Spain</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="http://olduli.nli.org.il/F/?func=find-b&local_base=NLX10&find_code=UID&request=987007529835405171">Israel</a></span></li></ul></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Hardware_description_language&oldid=1252986001">https://en.wikipedia.org/w/index.php?title=Hardware_description_language&oldid=1252986001</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Hardware_description_languages" title="Category:Hardware description languages">Hardware description languages</a></li><li><a href="/wiki/Category:Technical_communication" title="Category:Technical communication">Technical communication</a></li><li><a href="/wiki/Category:Logic_design" title="Category:Logic design">Logic design</a></li><li><a href="/wiki/Category:Programming_language_classification" title="Category:Programming language classification">Programming language classification</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:All_articles_with_dead_external_links" title="Category:All articles with dead external links">All articles with dead external links</a></li><li><a href="/wiki/Category:Articles_with_dead_external_links_from_July_2024" title="Category:Articles with dead external links from July 2024">Articles with dead external links from July 2024</a></li><li><a href="/wiki/Category:Articles_with_permanently_dead_external_links" title="Category:Articles with permanently dead external links">Articles with permanently dead external links</a></li><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_January_2013" title="Category:Articles needing additional references from January 2013">Articles needing additional references from January 2013</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li><li><a href="/wiki/Category:Wikipedia_articles_that_are_too_technical_from_April_2014" title="Category:Wikipedia articles that are too technical from April 2014">Wikipedia articles that are too technical from April 2014</a></li><li><a href="/wiki/Category:All_articles_that_are_too_technical" title="Category:All articles that are too technical">All articles that are too technical</a></li><li><a href="/wiki/Category:Articles_with_multiple_maintenance_issues" title="Category:Articles with multiple maintenance issues">Articles with multiple maintenance issues</a></li><li><a href="/wiki/Category:All_articles_needing_expert_attention" title="Category:All articles needing expert attention">All articles needing expert attention</a></li><li><a href="/wiki/Category:Articles_needing_expert_attention_from_April_2014" title="Category:Articles needing expert attention from April 2014">Articles needing expert attention from April 2014</a></li><li><a href="/wiki/Category:All_articles_with_unsourced_statements" title="Category:All articles with unsourced statements">All articles with unsourced statements</a></li><li><a href="/wiki/Category:Articles_with_unsourced_statements_from_July_2010" title="Category:Articles with unsourced statements from July 2010">Articles with unsourced statements from July 2010</a></li><li><a href="/wiki/Category:All_articles_with_vague_or_ambiguous_time" title="Category:All articles with vague or ambiguous time">All articles with vague or ambiguous time</a></li><li><a href="/wiki/Category:Vague_or_ambiguous_time_from_April_2014" title="Category:Vague or ambiguous time from April 2014">Vague or ambiguous time from April 2014</a></li><li><a href="/wiki/Category:Wikipedia_articles_needing_clarification_from_December_2018" title="Category:Wikipedia articles needing clarification from December 2018">Wikipedia articles needing clarification from December 2018</a></li><li><a href="/wiki/Category:Articles_with_unsourced_statements_from_April_2014" title="Category:Articles with unsourced statements from April 2014">Articles with unsourced statements from April 2014</a></li><li><a href="/wiki/Category:Commons_category_link_from_Wikidata" title="Category:Commons category link from Wikidata">Commons category link from Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 23 October 2024, at 20:37<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. By using this site, you agree to the <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use" class="extiw" title="foundation:Special:MyLanguage/Policy:Terms of Use">Terms of Use</a> and <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy" class="extiw" title="foundation:Special:MyLanguage/Policy:Privacy policy">Privacy Policy</a>. Wikipedia® is a registered trademark of the <a rel="nofollow" class="external text" href="https://wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, a non-profit organization.</li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:About">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:General_disclaimer">Disclaimers</a></li> <li id="footer-places-contact"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-mobileview"><a href="//en.m.wikipedia.org/w/index.php?title=Hardware_description_language&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobile view</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-f69cdc8f6-knhz5","wgBackendResponseTime":156,"wgPageParseReport":{"limitreport":{"cputime":"0.821","walltime":"1.032","ppvisitednodes":{"value":4668,"limit":1000000},"postexpandincludesize":{"value":141024,"limit":2097152},"templateargumentsize":{"value":18447,"limit":2097152},"expansiondepth":{"value":17,"limit":100},"expensivefunctioncount":{"value":13,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":107925,"limit":5000000},"entityaccesscount":{"value":1,"limit":400},"timingprofile":["100.00% 881.451 1 -total"," 26.62% 234.681 1 Template:Reflist"," 13.88% 122.326 5 Template:Navbox"," 13.16% 116.039 5 Template:Cite_book"," 12.89% 113.630 1 Template:Multiple_issues"," 12.50% 110.198 1 Template:Computer_language"," 10.50% 92.556 1 Template:Short_description"," 10.37% 91.389 10 Template:Fix"," 9.59% 84.491 1 Template:Commonscat"," 9.12% 80.406 1 Template:More_citations_needed"]},"scribunto":{"limitreport-timeusage":{"value":"0.512","limit":"10.000"},"limitreport-memusage":{"value":6928432,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-f69cdc8f6-qg7t2","timestamp":"20241122142353","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Hardware description language","url":"https:\/\/en.wikipedia.org\/wiki\/Hardware_description_language","sameAs":"http:\/\/www.wikidata.org\/entity\/Q173341","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q173341","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2002-08-22T01:05:43Z","dateModified":"2024-10-23T20:37:49Z","headline":"specialized computer language used to describe the structure and behavior of electronic circuits, and most commonly, digital logic circuits"}</script> </body> </html>