mirror of
https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git
synced 2025-12-14 18:38:55 +00:00
250 lines
27 KiB
HTML
250 lines
27 KiB
HTML
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
|
||
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content="表 1 . 术语定义 术语 定义 注释说明 SD Secure Digital Flash 存储卡的一种标准，即常见的 SD 卡 SDCard Secure Digital Memory Card 安全数码卡，同“SD 卡” MMC Multi Media Card 多媒体卡 eMMC Embedded Multi Media Card 内嵌（在板卡上）式多媒体卡 SDIO Secure ..."/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="topic"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-11-26"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="id"/><meta name="DC.language" content="zh-CN"/><title>SDMC 使用指南</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/sdmc/sdmc-user-guide.dita"/><meta name="wh-out-relpath" content="topics/sdk/sdmc/sdmc-user-guide.html"/>
|
||
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2023110923"/>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2023110923"/>
|
||
|
||
<script src="../../../webhelp/app/options/properties.js?buildId=20250121171154"></script>
|
||
<script src="../../../webhelp/app/localization/strings.js?buildId=2023110923"></script>
|
||
<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250121171154"></script>
|
||
<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2023110923"></script>
|
||
<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2023110923"></script>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-styles-web.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/notes.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-common.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-images.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/footnote.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-web-watermark.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/topic-body-list.css?buildId=2023110923"/></head>
|
||
|
||
<body id="id" class="wh_topic_page frmBody">
|
||
<a href="#wh_topic_body" class="sr-only sr-only-focusable">
|
||
跳转到主要内容
|
||
</a>
|
||
|
||
|
||
|
||
|
||
<header class="navbar navbar-default wh_header">
|
||
<div class="container-fluid">
|
||
<div class="wh_header_flex_container navbar-nav navbar-expand-md navbar-dark">
|
||
<div class="wh_logo_and_publication_title_container">
|
||
<div class="wh_logo_and_publication_title">
|
||
|
||
<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
|
||
<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></div>
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
<div class="wh_top_menu_and_indexterms_link collapse navbar-collapse" id="wh_top_menu_and_indexterms_link">
|
||
|
||
|
||
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</header>
|
||
|
||
|
||
|
||
|
||
<div class=" wh_search_input navbar-form wh_topic_page_search search " role="form">
|
||
|
||
|
||
|
||
<form id="searchForm" method="get" role="search" action="../../../search.html"><div><input type="search" placeholder="搜索 " class="wh_search_textfield" id="textToSearch" name="searchQuery" aria-label="搜索查询" required="required"/><button type="submit" class="wh_search_button" aria-label="搜索"><span class="search_input_text">搜索</span></button></div></form>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<div class="container-fluid" id="wh_topic_container">
|
||
<div class="row">
|
||
|
||
<nav class="wh_tools d-print-none navbar-expand-md" aria-label="Tools">
|
||
|
||
<div data-tooltip-position="bottom" class=" wh_breadcrumb "></div>
|
||
|
||
|
||
|
||
<div class="wh_right_tools">
|
||
<button class="wh_hide_highlight" aria-label="切换搜索突出显示" title="切换搜索突出显示"></button>
|
||
<button class="webhelp_expand_collapse_sections" data-next-state="collapsed" aria-label="折叠截面" title="折叠截面"></button>
|
||
|
||
|
||
|
||
|
||
<div class=" wh_print_link print d-none d-md-inline-block "><button onClick="window.print()" title="打印此页" aria-label="打印此页"></button></div>
|
||
|
||
|
||
</div>
|
||
|
||
</nav>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="wh_content_area">
|
||
<div class="row">
|
||
|
||
|
||
<div class="col-lg-10 col-md-10 col-sm-10 col-xs-12" id="wh_topic_body">
|
||
|
||
<button id="wh_close_topic_toc_button" class="close-toc-button d-none" aria-label="Toggle topic table of content" aria-controls="wh_topic_toc" aria-expanded="true">
|
||
<span class="close-toc-icon-container">
|
||
<span class="close-toc-icon"></span>
|
||
</span>
|
||
</button>
|
||
|
||
<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/sdmc/sdmc-user-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SDMC 使用指南</h1><div class="date inPage">26 Nov 2024</div><div style="color: gray;">
|
||
Read time: 2 minute(s)
|
||
</div><div class="- topic/body body"><div class="table-container"><table class="- topic/table table frame-all" id="id__table_n2m_pxh_bdc" data-ofbid="id__table_n2m_pxh_bdc" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col style="width:18.281535648994517%"/><col style="width:36.0146252285192%"/><col style="width:45.703839122486286%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_n2m_pxh_bdc__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_n2m_pxh_bdc__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_n2m_pxh_bdc__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">SD</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Secure Digital</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">Flash 存储卡的一种标准，即常见的 SD 卡</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">SDCard</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Secure Digital Memory Card</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">安全数码卡，同“SD 卡”</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">MMC</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Multi Media Card</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">多媒体卡</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">eMMC</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Embedded Multi Media Card</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">内嵌（在板卡上）式多媒体卡</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">SDIO</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Secure Digital Input and Output</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">安全数字输入输出接口</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">SDMC</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">SDCard & SDIO & eMMC Host Contollor</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">SD 卡/eMMC 主控制器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">CMD</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Command</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">SD/eMMC 协议的命令</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__1">DMA</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__2">Direct Memory Access</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_n2m_pxh_bdc__entry__3">直接存储器访问</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_n2m_pxh_bdc__entry__1">SPI</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_n2m_pxh_bdc__entry__2">Serial Peripheral Interface</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_n2m_pxh_bdc__entry__3">串行外设接口</td></tr></tbody></table></div><p class="- topic/p p" data-ofbid="d268931e99__20250121171738">其中：</p><ul class="- topic/ul ul simple" id="id__ul_o2m_pxh_bdc" data-ofbid="id__ul_o2m_pxh_bdc"><li class="- topic/li li" data-ofbid="d268931e102__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e104__20250121171738">MMC 是最早的记忆卡标准，1997 年由西门子和 SanDisk 推出，现在市场上已经很少见了</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e107__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e109__20250121171738">SDCard 是 1998 年由松下、东芝和 SanDisk 合作发布</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e112__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e114__20250121171738">SDCard 一开始就兼容 MMC 协议，和 MMC 在时序设计上保持一致，读写控制命令也一样</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e117__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e119__20250121171738">SDIO 是在 SD 标准的基础上，定义了非存储卡的外设接口，可连接 WiFi、BT、摄像头等</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e122__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e124__20250121171738">SD 卡后续还有 SDHC（High Capacity，大容量，最大 32 GB）和 SDXC（eXtended Capacity，最大 2 TB），本文将
|
||
SD、SDHC、SDXC 统称为 SD</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e127__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e129__20250121171738">eMMC 是 MMC 框架中的一种，经过多年演化后，从 2018 年起只留下 eMMC 了</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e132__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e134__20250121171738">eMMC 可以看作一个集合，其中包含：NAND Flash、Flash 控制器、MMC 标准接口封装</p>
|
||
</li></ul><section class="- topic/section section" id="id__section_swv_kwh_ddc" data-ofbid="id__section_swv_kwh_ddc"><h2 class="- topic/title title sectiontitle">SDMC V1.0 功能说明</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d268931e143__20250121171738">SDMC V1.0 可用于访问三种标准协议：SDCard、eMMC 设备、SDIO。 以 D21x 为例，SoC 硬件提供了三套 SDMC，功能的初始定义如下：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_p2m_pxh_bdc" data-ofbid="id__table_p2m_pxh_bdc" data-cols="2"><caption></caption><colgroup><col style="width:41.49377593360995%"/><col style="width:58.50622406639003%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_p2m_pxh_bdc__entry__1">SDMC</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_p2m_pxh_bdc__entry__2">支持功能</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_p2m_pxh_bdc__entry__1">SDMC0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_p2m_pxh_bdc__entry__2">SDCard、 eMMC</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_p2m_pxh_bdc__entry__1">SDMC1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_p2m_pxh_bdc__entry__2">SDCard</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_p2m_pxh_bdc__entry__1">SDMC2</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_p2m_pxh_bdc__entry__2">SDIO</td></tr></tbody></table></div>
|
||
</section><section class="- topic/section section" id="id__sd-sdio" data-ofbid="id__sd-sdio"><h2 class="- topic/title title sectiontitle">SD/SDIO 的传输模式</h2>
|
||
|
||
<figure class="- topic/fig fig fignone" id="id__id4" data-ofbid="id__id4"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_q2m_pxh_bdc" src="../../../images/sdmc/sd_mode.png" width="288" alt="sd_mode"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">SD/SDIO 的三种传输模式</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d268931e188__20250121171738">SD/SDIO 的传输模式有三种：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_r2m_pxh_bdc" data-ofbid="id__ol_r2m_pxh_bdc"><li class="- topic/li li" data-ofbid="d268931e192__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e194__20250121171738">SPI 模式：为了兼容性考虑，此模式属于 required，对硬件要求低，不支持 CRC 校验。时钟最高 25 MHz，读写速度通常低于 3
|
||
MB/s。广泛用于 MP3 等对读卡速度要求不高的场景。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e197__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e199__20250121171738">1bit 模式：时钟最高 25 MHz，最高速率 12.5 MB/s</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e202__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e204__20250121171738">4bit 模式：读写时钟最高可达 50 MHz，最高速率 25 MB/s，是 <strong class="+ topic/ph hi-d/b ph b">SD 的主要模式</strong></p>
|
||
</li></ol>
|
||
<p class="- topic/p p" data-ofbid="d268931e210__20250121171738">其中“1bit 模式”和“4bit 模式”又可以统称为“SD 模式”。</p>
|
||
<p class="- topic/p p" data-ofbid="d268931e214__20250121171738">下表是三种传输模式对应的接口信号线定义：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id5" data-ofbid="id__id5"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_s2m_pxh_bdc" src="../../../images/sdmc/sd_mode_io.png" alt="sd_mode_io"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">SD/SDIO 三种传输模式的接口定义</span></figcaption></figure>
|
||
</section><section class="- topic/section section" id="id__mmc" data-ofbid="id__mmc"><h2 class="- topic/title title sectiontitle">MMC 的工作模式</h2>
|
||
|
||
<figure class="- topic/fig fig fignone" id="id__id6" data-ofbid="id__id6"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_t2m_pxh_bdc" src="../../../images/sdmc/mmc_mode.png" alt="mmc_mode"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">MMC 的工作模式</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d268931e236__20250121171738">MMC 标准经过了 5 个大版本的演化，已经发生了很大的变化。大体上可以分为两种工作模式：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_u2m_pxh_bdc" data-ofbid="id__ol_u2m_pxh_bdc"><li class="- topic/li li" data-ofbid="d268931e240__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e242__20250121171738">SPI 模式：可选模式，属于 MMC 协议的一个子集，最大速率 20 Mbps。主要用于小容量、低速率场景，可降低成本，也有很好的兼容性</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e245__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e247__20250121171738">MMC 模式：默认模式，具有 MMC 的全部特性，支持 1/4/8bit 总线模式</p>
|
||
</li></ol>
|
||
<p class="- topic/p p" data-ofbid="d268931e251__20250121171738">MMC 模式从传输速率上看又可以分为以下几种：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id7" data-ofbid="id__id7"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_v2m_pxh_bdc" src="../../../images/sdmc/mmc_mode_data.png" alt="mmc_mode_data"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 4</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">MMC 工作模式及相应速率</span></figcaption></figure>
|
||
<div class="- topic/note note tip note_tip" id="id__note_bmy_rxh_ddc" data-ofbid="id__note_bmy_rxh_ddc"><span class="note__title">提示：</span>
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_w2m_pxh_bdc" data-ofbid="id__ol_w2m_pxh_bdc"><li class="- topic/li li" data-ofbid="d268931e265__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e267__20250121171738">HS400 是在 HS200 的基础上增加 DDR 模式（信号双边采样），将理论速率提升一倍。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e270__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e272__20250121171738">MMC 上电或者复位后，默认处于 1bit 模式，只使用信号线 DAT[0]传输数据，后续通过命令将其配置为 4/8bit 模式。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e275__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e277__20250121171738">eMMC 芯片不支持 SPI 模式。</p>
|
||
</li></ol>
|
||
</div>
|
||
</section><section class="- topic/section section" id="id__sdmc" data-ofbid="id__sdmc"><h2 class="- topic/title title sectiontitle">SDMC 的功能特性</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d268931e287__20250121171738">SDMC 支持的最大接口频率为 200 MHz，支持 1/4/8 线数据总线模式，满足 eMMC 标准协议和 SDCard/SDIO 接口协议。</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id8" data-ofbid="id__id8"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_x2m_pxh_bdc" src="../../../images/sdmc/hw_structure2.png" alt="sdmc_hw_structure"/></div><br/><div class="- topic/div div legend">
|
||
<p class="- topic/p p" data-ofbid="d268931e298__20250121171738">SDMC 支持的特性有：</p>
|
||
</div><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 5</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">SDMC 硬件原理示意图</span></figcaption></figure>
|
||
<ul class="- topic/ul ul simple" id="id__ul_y2m_pxh_bdc" data-ofbid="id__ul_y2m_pxh_bdc"><li class="- topic/li li" data-ofbid="d268931e303__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e305__20250121171738">支持 eMMC5.0，SD3.01 和 SDIO3.0，向下兼容</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e308__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e310__20250121171738">支持 eMMC SDR/DDR 模式，接口时钟频率最大 200 MHz</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e313__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e315__20250121171738">支持 3.3V 工作电压</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e318__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e320__20250121171738">支持 DDR 4 线和 8 线模式</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e323__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e325__20250121171738">使用内部 DMA 模式，支持单通道、双缓存和描述符链表传输</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e328__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e330__20250121171738">支持 FIFO 深度为 128，FIFO 位宽为 32 bit</p>
|
||
</li><li class="- topic/li li" data-ofbid="d268931e333__20250121171738">
|
||
<p class="- topic/p p" data-ofbid="d268931e335__20250121171738">支持 CRC 生成和错误检测</p>
|
||
</li></ul>
|
||
</section></div></article></main></div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<nav role="navigation" id="wh_topic_toc" aria-label="On this page" class="col-lg-2 d-none d-lg-block navbar d-print-none">
|
||
<div id="wh_topic_toc_content">
|
||
|
||
<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__section_swv_kwh_ddc" data-tocid="id__section_swv_kwh_ddc">SDMC V1.0 功能说明</a></div></li><li class="section-item"><div class="section-title"><a href="#id__sd-sdio" data-tocid="id__sd-sdio">SD/SDIO 的传输模式</a></div></li><li class="section-item"><div class="section-title"><a href="#id__mmc" data-tocid="id__mmc">MMC 的工作模式</a></div></li><li class="section-item"><div class="section-title"><a href="#id__sdmc" data-tocid="id__sdmc">SDMC 的功能特性</a></div></li></ul></div>
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
<footer class="navbar navbar-default wh_footer">
|
||
<div class=" footer-container mx-auto ">
|
||
<title>footer def</title>
|
||
<style><!--
|
||
|
||
.p1 {
|
||
font-family: FangZhengShuSong, Times, serif;
|
||
}
|
||
.p2 {
|
||
font-family: Arial, Helvetica, sans-serif;
|
||
}
|
||
.p3 {
|
||
font-family: "Lucida Console", "Courier New", monospace;
|
||
}
|
||
|
||
--></style>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="webhelp.fragment.footer">
|
||
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
|
||
</div><div>
|
||
<div class="generation_time">
|
||
Update Time: 2025-01-21
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
<div id="go2top" class="d-print-none">
|
||
<span class="oxy-icon oxy-icon-up"></span>
|
||
</div>
|
||
|
||
<div id="modal_img_large" class="modal">
|
||
<span class="close oxy-icon oxy-icon-remove"></span>
|
||
<div id="modal_img_container"></div>
|
||
<div id="caption"></div>
|
||
</div>
|
||
|
||
|
||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||
|
||
|
||
</body>
|
||
</html> |