SDIO/iSDIO | SD Association

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src="https://www.sdcard.org/cms/wp-content/themes/sdcard-org/library/images/blankicon.gif" alt=""></a></li> </ul> </li> </ul> <ul class="gnav_1_c_box"> <li> <div class="bg-navy"><span class="fr ml20 mb10"><img src="https://www.sdcard.org/cms/wp-content/themes/sdcard-org/library/images/gnav1_img01.jpg" alt="" width="171" height="173"></span> <p>About SD Association</p> <p class="f_size12">Founded in January 2000 by Panasonic, SanDisk and Toshiba (now KIOXIA), the SD Association is a group dedicated to establishing SD standards and facilitating their adoption and development.<br> At its outset the Association represented just 14 member companies and has grown into a global alliance comprised of around 800 member companies. By developing and adopting SD standards, members enjoy better compatibility of member cards between devices, greatly enhancing consumer enjoyment and convenience.</p> </div> </li> </ul> </li></div> </ul></div> </li> <li class="mega-menu-list dc-mega-li"> <a href="https://www.sdcard.org/consumers/" class="mega-menu-list-ttl dc-mega">Consumers<span class="dc-mega-icon"></span></a> <div class="sub-container mega" style="left: 0px; top: 40px; z-index: 1000;"><ul class="relative sub" style="display: none;"> <div class="row" style="width: 980px;"><li class="megabox mega-unit mega-hdr last" style="height: 321px;"><span class="triangle triangle_2"></span> <ul class="gnav_2_a_box"> <li> <ul class="linklist"> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/">About SD Memory Card Choices</a> <ul> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/sd-sdhc-sdxc-and-sduc-card-capacity-choices/">SD, SDHC, SDXC and SDUC Card Capacity Choices</a></li> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/bus-interface-speed-standards-for-large-size-data-transfer/">Bus Interface Speed Standards for Large Size Data Transfer</a></li> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/speed-class-standards-for-video-recording/">Speed Class Standards for Video Recording</a></li> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/application-performance-class-for-running-smartphone-apps/">Application Performance Class for Running Smartphone Apps</a></li> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/low-voltage-signaling/">Low Voltage Signaling</a></li> <li><a href="https://www.sdcard.org/consumers/about-sd-memory-card-choices/copyright-protection-for-digital-data-cprm/">Copyright Protection for Digital Data (CPRM)</a></li> </ul> </li> </ul> </li> </ul> <ul class="gnav_2_b_box"> <li> <ul class="linklist"> <li><a href="https://www.sdcard.org/svp/">SD Express / UHS-II Verification Program (SVP) Verified Product</a></li> <li><a href="https://www.sdcard.org/consumers/choosemicrosd/">#choosemicroSD</a></li> <li><a href="https://www.sdcard.org/consumers/usage-tip-videos/">Usage Tip Videos</a></li> <li><a href="https://www.sdcard.org/consumers/faq/">FAQ</a></li> </ul> </li> </ul> <ul class="gnav_2_c_box"> <li> <div class="bg-navy"><span class="fr ml20 mb10"><img src="https://www.sdcard.org/cms/wp-content/themes/sdcard-org/library/images/gnav2_img01.jpg" alt="" width="171" height="173"></span> <p>Consumers</p> <p class="f_size12">The SD Association has prepared multiple SD standards relating to such features as memory capacity and reading/writing speed in order for users to select the optimum card for their device.</p> </div> </li> </ul> </li></div> </ul></div> </li> <li class="mega-menu-list dc-mega-li"> <a href="https://www.sdcard.org/developers/" class="mega-menu-list-ttl dc-mega">Developers<span 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href="https://www.sdcard.org/developers/boot-and-new-security-features/">Boot and Extended Security Features (RPMB and TCG)</a> <ul> <li><a href="https://www.sdcard.org/developers/boot-and-new-security-features/boot-function/">Boot (secured and fast)</a></li> <li><a href="https://www.sdcard.org/developers/boot-and-new-security-features/tcg-storage-in-sd-memory-cards/">TCG</a></li> <li><a href="https://www.sdcard.org/developers/boot-and-new-security-features/replay-protected-memory-block/">RPMB</a></li> </ul> </li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/speed-class/">Speed Class</a></li> <li><a class="level_3" href="https://www.sdcard.org/developers/sd-standard-overview/application-performance-class/">Application  Performance Class</a></li> <li><a class="level_3" href="https://www.sdcard.org/developers/sd-standard-overview/low-voltage-signaling/">Low Voltage Signaling</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/content-protection/">Content Protection</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/host-controllers/">Host Controllers</a> </li> </ul> </li> </ul> </li> </ul> <ul class="gnav_3_b_box"> <li> <ul class="linklist"> <li class="noliststyle">  <ul> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/sdio-isdio/">SDIO/iSDIO</a> <ul> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/sdio-isdio/wireless-lan-sd/">Wireless LAN SD</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/sdio-isdio/transferjet-sd/">TransferJet SD</a></li> </ul> </li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/assd/">ASSD</a> <ul> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/assd/smartsd/">smartSD</a></li> </ul> </li> </ul> </li> </ul> </li> </ul> <ul class="gnav_3_c_box"> <li> <ul class="linklist"> <li class="noliststyle">  <ul> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/embedded-sd/">Embedded SD</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/">Application Formats</a> <ul> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/sd-audio/">SD-Audio</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/sd-video/">SD-Video</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/sd-binding/">SD-Binding</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/sd-sd/">SD-SD</a></li> <li><a href="https://www.sdcard.org/developers/sd-standard-overview/application-formats/sd-sd-ebook/">SD-SD eBook</a></li> </ul> </li> </ul> </li> </ul> </li> </ul> <ul class="gnav_3_d_box"> <li> <ul class="linklist"> <li><a href="https://www.sdcard.org/developers/svp/">SD Express / UHS-II Verification Program (SVP) Verified Product</a></li> <li><a href="https://www.sdcard.org/developers/how-to-start-using-sd-standards-in-your-product/">How to Start Using SD Standards in Your Product</a></li> <li><a href="https://www.sdcard.org/developers/use-and-licensing/">Use and Licensing</a></li> </ul> </li> </ul> </li></div> </ul></div> </li> <li class="mega-menu-list dc-mega-li"> <a href="https://www.sdcard.org/downloads/" class="mega-menu-list-ttl dc-mega">Downloads<span class="dc-mega-icon"></span></a> <div class="sub-container mega" style="left: 0px; top: 40px; z-index: 1000;"><ul class="relative sub" style="display: none;"> <div class="row" style="width: 980px;"><li class="megabox mega-unit mega-hdr last" style="height: 400px;"><span class="triangle triangle_4"></span> <ul class="gnav_4_a_box"> <li> <ul class="linklist"> <li><a href="https://www.sdcard.org/downloads/pls/latest_whitepapers/">SD Association Whitepapers</a></li> <li><a href="https://www.sdcard.org/downloads/pls/">Simplified Specifications</a></li> <li><a href="https://www.sdcard.org/downloads/formatter/">SD Memory Card Formatter for Windows/Mac</a> <ul> <li><a href="https://www.sdcard.org/downloads/formatter/sd-memory-card-formatter-for-windows-download/">SD Memory Card Formatter for Windows Download</a></li> <li><a href="https://www.sdcard.org/downloads/formatter/sd-memory-card-formatter-for-mac-download/">SD Memory Card Formatter for Mac Download</a></li> <li><a href="https://www.sdcard.org/downloads/formatter/faq/">FAQ</a></li> </ul> </li> <li><a href="https://www.sdcard.org/downloads/sd-memory-card-formatter-for-linux/">SD Memory Card Formatter for Linux</a> <ul> <li><a href="https://www.sdcard.org/downloads/sd-memory-card-formatter-for-linux/sd-memory-card-formatter-for-linux-x86-64-download/">SD Memory Card Formatter for Linux_x86_64 Download</a></li> <li><a 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Express / UHS-II Verification Program (SVP) Verified Product</a></li><li class="line level_2"><a href="https://www.sdcard.org/developers/how-to-start-using-sd-standards-in-your-product/">How to Start Using SD Standards in Your Product</a></li><li class="line level_2"><a href="https://www.sdcard.org/developers/use-and-licensing/">Use and Licensing</a></li> </ul> </div> </div> </div> </div> <main id="main" class="m-all t-all d-fixed-670 cf" role="main" itemscope itemprop="mainContentOfPage" itemtype="http://schema.org/Blog"> <article id="post-1099" class="cf post-1099 page type-page status-publish hentry" role="article" itemscope itemtype="http://schema.org/BlogPosting"> <section class="entry-content cf" itemprop="articleBody"> <div class="main"> <div class="clearfix"> <h2 class="fast">History of SDIO Standardization</h2> <p>SDIO was introduce in 2001 and it played a role of increasing SD host devices. SDA defined several SDIO Standard Functions Cards such as Bluetooth®, GPS, Camera, etc.</p> <p><img fetchpriority="high" decoding="async" style="MARGIN: 0px 0px 20px" alt="Common SDIO Cards" src="https://www.sdcard.org/cms/wp-content/uploads/2020/12/sdio_card.jpg" width="255" height="208" border="0"></p> <p>SDIO is gradually utilized to connect I/O devices as embedded by using multiple devices connection feature on an SD bus. SDIO Interface became popular by acquiring great interest in simple SD bus connection feature and higher bus speed modes support. Embedded solution enables host system to access SDIO devices in anytime and SD Card Slot can be dedicated to SD Memory Card for user.<br /> At present, most typical I/O functions are integrated in system SOC, and then SDIO is utilized mainly for wireless communication devices that is not proper for SOC integration due to rapid progress of wireless standards that pursue higher bit rate communication.</p> <h2 class="fast">Standard SDIO Function</h2> <p>Standard SDIO Function is intended to make SDIO Card usable without installing special function driver so that anybody can use SDIO Card instantly.<br /> However, standardization of SDIO function is not essential if I/O function drivers can be pre-installed in host system (an operating system) or host device is capable of installing a specific driver through internet. Standardization of a function application interface (API) is supposed rather much more important to control SDIO device. However Function API will depend on kinds of OS.<br /> SDIO LAN Controller was an example that could not be defined as SDIO Standard Function because several types of LAN controller register interface already exist in the market and it was impossible to select only one register set as SDIO standard.</p> <p class="mt20 linkbtn"><a href="https://www.sdcard.org/downloads/pls/"><br /> <img decoding="async" src="https://www.sdcard.org/cms/wp-content/uploads/2020/12/linkbtn_01.png" alt="Simplified Version of SD Host Controller Spec" class="imgover"><br /> </a></p> <h2 class="fast">iSDIO Specification</h2> <p>Intelligent SDIO (iSDIO) was introduced in 2013. iSDIO Specification is defined as a subset of SDIO Specification for Combo Card. A part of SDIO register set is used for simplicity. iSDIO enables internal data transfer between memory module and I/O function module via Card Controller. High-Speed data transfer is possible by free of influence from bus interface speed limitation and host device overhead. iSDIO also enables two memory access paths; SD Bus Interface and Wireless Interface of I/O function. SDA standardized iSDIO functions such as Wireless LAN and TransferJet.<br /> <img decoding="async" src="https://www.sdcard.org/cms/wp-content/uploads/2020/12/isdio.png" alt="iSDIO Specification"></p> <p class="mt20 linkbtn"> <a href="https://www.sdcard.org/downloads/pls/"><br /> <img decoding="async" src="https://www.sdcard.org/cms/wp-content/uploads/2020/12/linkbtn_01.png" alt="Simplified Version of SD Host Controller Spec" class="imgover"><br /> </a></p> <h2 class="fast">Function Extension Specification</h2> <p>There were many SD Host products that supported SD Memory Card but the number of SDIO supported hosts was small. Memory Host Controller was considered unsuitable to control I/O function due to at least 512-byte unit access, while I/O function requires byte unit register operation.<br /> “Function Extension Specification” was introduced from the Physical Layer Ver.4.10 to solve this issue.<br /> It enables hosts to operate register space in byte unit even by Memory Host Controller.</p> <p>As iSDIO Specification adopted the Function Extension, iSDIO Combo Card could be implemented so that most existing hosts can use it iSDIO Combo Card can implement not only SDIO commands but also Function Extension commands. Function<br /> Extension provides better usability regardless of host types and SDIO provides better control efficiency by using quick SDIO commands. iSDIO has another advantage that gets free from a burden to trace SDIO “tuples” during initialization. “General Information” defined by Function Extension provides initialization information instead.</p> <h2 class="fast">Combo Card Types</h2> <p>There are two types of Combo Cards:</p> <div id="sdio"> <dl> <dt style="float:left"> <span style="font-weight:normal">(1)</span></dt> <dd>ASSD [Part A1, A3] is security interface for SD Card using Switch Function Command Set. smart SD is ASSD Combo Card.</dd> </dl> <dl> <dt style="float:left"> <span style="font-weight:normal">(2)</span></dt> <dd>iSDIO [Part E7] is simplified interface of SDIO but rather having flexibly in command set. Then iSDIO should be adopted for Combo instead of SDIO. Wireless LAN Card and TransferJet Card<br /> are iSDIO Combo Card.</dd> </dl> <p class="mt30"> <img decoding="async" src="https://www.sdcard.org/cms/wp-content/uploads/2020/12/sd_standards_family.jpg" alt="SD Standards Family"></p> </div> </div> </div> </section> <footer class="article-footer"> </footer> </article> </main> </div> </div> <footer class="footer" role="contentinfo" itemscope itemtype="http://schema.org/WPFooter"> <div id="inner-footer" class="wrap cf"> <nav role="navigation"> </nav> <div class="copy"> <p class="mt15 mb5"><span>SD and related marks and logos are trademarks of SD-3C LLC.</span></p> <p class="mb5">© 2000 - 2024 SD-3C LLC. All Rights Reserved.</p> <p><span>Copyright © SD Association. 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