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href="https://cs.wikipedia.org/wiki/Double_data_rate" title="Double data rate – tchèque" lang="cs" hreflang="cs" data-title="Double data rate" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Double_Data_Rate" title="Double Data Rate – allemand" lang="de" hreflang="de" data-title="Double Data Rate" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Double_data_rate" title="Double data rate – anglais" lang="en" hreflang="en" data-title="Double data rate" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Double_Data_Rate" title="Double Data Rate – basque" lang="eu" hreflang="eu" data-title="Double Data Rate" data-language-autonym="Euskara" data-language-local-name="basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D8%B1%D8%AE_%D8%AF%D9%88%D8%A8%D8%B1%D8%A7%D8%A8%D8%B1_%D8%AF%D8%A7%D8%AF%D9%87%E2%80%8C%D9%87%D8%A7" title="نرخ دوبرابر داده‌ها – persan" lang="fa" hreflang="fa" data-title="نرخ دوبرابر داده‌ها" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Double_data_rate" title="Double data rate – norvégien bokmål" lang="nb" hreflang="nb" data-title="Double data rate" data-language-autonym="Norsk bokmål" data-language-local-name="norvégien bokmål" 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class="mw-indicators"> </div> <div id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirigé depuis <a href="/w/index.php?title=Double_Data_Rate&redirect=no" class="mw-redirect" title="Double Data Rate">Double Data Rate</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="fr" dir="ltr"><p class="mw-empty-elt"> </p> <div class="bandeau-container metadata homonymie hatnote"><div class="bandeau-cell bandeau-icone" style="display:table-cell;padding-right:0.5em"><span class="noviewer" typeof="mw:File"><a href="/wiki/Aide:Homonymie" title="Aide:Homonymie"><img alt="Page d’aide sur l’homonymie" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Logo_disambig.svg/20px-Logo_disambig.svg.png" decoding="async" width="20" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Logo_disambig.svg/30px-Logo_disambig.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Logo_disambig.svg/40px-Logo_disambig.svg.png 2x" data-file-width="512" data-file-height="375" /></a></span></div><div class="bandeau-cell" style="display:table-cell;padding-right:0.5em"> <p>Pour les articles homonymes, voir <a href="/wiki/DDR" class="mw-disambig" title="DDR">DDR</a>. </p> </div></div> <figure typeof="mw:File/Thumb"><a href="/wiki/Fichier:SDR_DDR_QDR.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/81/SDR_DDR_QDR.svg/350px-SDR_DDR_QDR.svg.png" decoding="async" width="350" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/81/SDR_DDR_QDR.svg/525px-SDR_DDR_QDR.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/81/SDR_DDR_QDR.svg/700px-SDR_DDR_QDR.svg.png 2x" data-file-width="401" data-file-height="206" /></a><figcaption>Comparaison des moments de transfert des données en <i><a href="/wiki/Single_data_rate" title="Single data rate">single data rate</a></i>, <b>double data rate</b> et <i><a href="/wiki/Quad_data_rate" title="Quad data rate">quad data rate</a></i>.</figcaption></figure> <p>Un <a href="/wiki/Bus_informatique" title="Bus informatique">bus informatique</a> ou une <a href="/wiki/M%C3%A9moire_(informatique)" title="Mémoire (informatique)">mémoire</a> fonctionnant en <b><span class="lang-en" lang="en">double data rate</span></b> (« débit de données double »), ou <b>DDR</b>, transfère les données à la fois sur le <a href="/wiki/Front_montant" class="mw-redirect" title="Front montant">front montant</a> et sur le <a href="/wiki/Front_descendant" class="mw-redirect" title="Front descendant">front descendant</a> des impulsions d'horloge, ce qui a pour effet de doubler le débit du bus en évitant les problèmes de synchronisation (<i><span class="lang-en" lang="en">timing skew</span></i>). </p><p>La technique de <i>DDR</i> est utilisée pour différents bus et mémoires tels que : </p> <ul><li><a href="/wiki/Front_side_bus" title="Front side bus">Front side bus</a> ;</li> <li><a href="/wiki/Small_Computer_System_Interface#Ultra_3" title="Small Computer System Interface">Ultra 3 SCSI</a> ;</li> <li>bus <a href="/wiki/Accelerated_Graphics_Port" class="mw-redirect" title="Accelerated Graphics Port">AGP</a> ;</li> <li><a href="/wiki/DDR_SDRAM" title="DDR SDRAM">DDR SDRAM</a>.</li></ul> <p>L'évolution du <i>DDR</i> est passée au <a href="/wiki/Quad_data_rate" title="Quad data rate">quad data rate</a>. Le <a href="/wiki/Pentium_4" title="Pentium 4">Pentium 4</a> d'<a href="/wiki/Intel" title="Intel">Intel</a>, par exemple, utilise cette technique pour arriver à 800 <abbr class="abbr" title="mégatesla par seconde">MT/s</abbr> (200 <abbr class="abbr" title="mégahertz">MHz</abbr> × 4), 1 066 <abbr class="abbr" title="mégatesla par seconde">MT/s</abbr> (266 <abbr class="abbr" title="mégahertz">MHz</abbr> × 4), ou 1 333 <abbr class="abbr" title="mégatesla par seconde">MT/s</abbr> (333 Mhz × 4). Avec une largeur de bus de 64 bits (8 octets), cela donne des débits théoriques de 200 MHz × 4 × 8 (Octets) = 800 <a href="/wiki/Megatransfer" class="mw-redirect" title="Megatransfer">MT/s</a> × 8 (Octets) = 6,4 Go/s à 10,664 Go/s. De la même façon, le bus des microprocesseurs pour <a href="/wiki/Socket_754" title="Socket 754">socket 754</a> et <a href="/wiki/Socket_939" title="Socket 939">socket 939</a> d'<a href="/wiki/Advanced_Micro_Devices" title="Advanced Micro Devices">AMD</a> utilise respectivement le « <i><span class="lang-en" lang="en">double-pumped</span></i> » et le dual « <i><span class="lang-en" lang="en">double-pumped</span></i> » (Dual Channel). </p><p>Un remplacement au doublement ou au quadruplement est de faire en sorte que les connexions s'auto-synchronisent (<a href="/w/index.php?title=Self-clocking&action=edit&redlink=1" class="new" title="Self-clocking (page inexistante)">self-clocking</a>). Cette option a été choisie par les concepteurs des bus <a href="/wiki/Infiniband" class="mw-redirect" title="Infiniband">Infiniband</a> et <a href="/wiki/PCI_Express" title="PCI Express">PCI Express</a>. </p><p>Il est souvent difficile de connaître la vitesse réelle d'un matériel DDR. Certains évoquent la fréquence d'horloge et d'autres se réfèrent au nombre de transferts par seconde. Il est moins ambigu de parler de la bande passante brute d'un bus car cela prend aussi en compte la largeur du bus : ainsi, une mémoire <a href="/wiki/DDR_SDRAM" title="DDR SDRAM">DDR SDRAM</a> fonctionnant à une fréquence d'horloge de 100 <abbr class="abbr" title="mégahertz">MHz</abbr> avec une vitesse de transfert équivalente à une <a href="/wiki/SDR_SDRAM" class="mw-redirect" title="SDR SDRAM">SDR SDRAM</a> fonctionnant à 200 <abbr class="abbr" title="mégahertz">MHz</abbr> est appelée DDR-200 et PC-1600, si on se réfère à la bande passante (voir <a href="/wiki/DDR_SDRAM" title="DDR SDRAM">DDR SDRAM</a>). Toutefois, cela ne prend pas en compte le protocole de gestion du bus et le temps de latence, éléments qui peuvent pourtant réduire la bande passante effective à une fraction de la bande passante brute. </p> <div class="mw-heading mw-heading2"><h2 id="Voir_aussi">Voir aussi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_data_rate&veaction=edit&section=1" title="Modifier la section : Voir aussi" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Double_data_rate&action=edit&section=1" title="Modifier le code source de la section : Voir aussi"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Articles_connexes">Articles connexes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_data_rate&veaction=edit&section=2" title="Modifier la section : Articles connexes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Double_data_rate&action=edit&section=2" title="Modifier le code source de la section : Articles connexes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Architecture_de_m%C3%A9moire_%C3%A0_multiples_canaux" title="Architecture de mémoire à multiples canaux">Architecture de mémoire à multiples canaux</a></li> <li><a href="/wiki/Megatransfer" class="mw-redirect" title="Megatransfer">Megatransfer</a></li> <li><a href="/wiki/Quad_data_rate" title="Quad data rate">Quad data rate</a></li></ul> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Informatique" title="Portail de l’informatique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Circle-icons-computer.svg/24px-Circle-icons-computer.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Circle-icons-computer.svg/36px-Circle-icons-computer.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/02/Circle-icons-computer.svg/48px-Circle-icons-computer.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Informatique" title="Portail:Informatique">Portail de l’informatique</a></span> </span></li> </ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Ce document provient de « <a dir="ltr" href="https://fr.wikipedia.org/w/index.php?title=Double_data_rate&oldid=219564092">https://fr.wikipedia.org/w/index.php?title=Double_data_rate&oldid=219564092</a> ».</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Cat%C3%A9gorie:Accueil" title="Catégorie:Accueil">Catégories</a> : <ul><li><a href="/wiki/Cat%C3%A9gorie:Bus_informatique" title="Catégorie:Bus informatique">Bus informatique</a></li><li><a href="/wiki/Cat%C3%A9gorie:M%C3%A9moire_informatique" title="Catégorie:Mémoire informatique">Mémoire informatique</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Catégories cachées : <ul><li><a href="/wiki/Cat%C3%A9gorie:Portail:Informatique/Articles_li%C3%A9s" title="Catégorie:Portail:Informatique/Articles liés">Portail:Informatique/Articles liés</a></li><li><a href="/wiki/Cat%C3%A9gorie:Portail:Technologies/Articles_li%C3%A9s" title="Catégorie:Portail:Technologies/Articles liés">Portail:Technologies/Articles liés</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"> La dernière modification de cette page a été faite le 18 octobre 2024 à 22:04.</li> <li id="footer-info-copyright"><span style="white-space: normal"><a href="/wiki/Wikip%C3%A9dia:Citation_et_r%C3%A9utilisation_du_contenu_de_Wikip%C3%A9dia" title="Wikipédia:Citation et réutilisation du contenu de Wikipédia">Droit d'auteur</a> : les textes sont disponibles sous <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.fr">licence Creative Commons attribution, partage dans les mêmes conditions</a> ; d’autres conditions peuvent s’appliquer. 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