wen/luban-lite-t3e-pro
1
0
Fork 0
mirror of https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git synced 2025-12-14 18:38:55 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
fe0b990053fc29df772a4716d8fa9185f28e1283
luban-lite-t3e-pro/doc/topics/sdk/sdmc/sdmc-user-guide_2.html

267 lines
41 KiB
HTML
Raw Normal View History

add doc v1.1.2
2025-01-23 16:37:00 +08:00
<!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.relation" content="../../../topics/chapter-title/chapter-memory-sdk.html"/><meta name="DC.relation" content="../../../topics/chapter-title/chapter-memory-sdk.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-config-lite.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-config-lite.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-debug_guide-lite.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-test-guide-lite.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-design-guide-lite.html"/><meta name="DC.relation" content="../../../topics/sdk/sdmc/sdmc-faq_2.html"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-01-15"/><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="id-d5856e3375"/><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_2.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 "><ol class="d-print-none"><li><span class="home"><a href="../../../index.html"><span>主页</span></a></span></li><li><div class="topicref" data-id="id"><div class="title"><a href="../../../topics/sdk/chapter-advanced-app.html">高级应用</a><div class="wh-tooltip"><p class="shortdesc">系统、存储、多媒体、接口、安全等模块的详细配置和设计说明。</p></div></div></div></li><li><div class="topicref" data-id="chapter-memory"><div class="title"><a href="../../../topics/chapter-title/chapter-memory-sdk.html">存储</a><div class="wh-tooltip"><p class="shortdesc">SDMC、SPI NAND、SPI NOR<span class="ph"> 以及文件系统</span> 等存储模块的介绍和使用说明。</p></div></div></div></li><li class="active"><div class="topicref" data-id="id"><div class="title"><a href="../../../topics/sdk/sdmc/sdmc-user-guide_2.html">SDMC 使用指南</a></div></div></li></ol></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_navigation_links "><span id="topic_navigation_links" class="navheader">
<span class="navprev"><a class="- topic/link link" href="../../../topics/chapter-title/chapter-memory-sdk.html" title="存储" aria-label="上一主题: 存储" rel="prev"></a></span>
<span class="navnext"><a class="- topic/link link" href="../../../topics/sdk/sdmc/sdmc-config-lite.html" title="SDMC 配置" aria-label="下一主题: SDMC 配置" rel="next"></a></span> </span></div>
<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>
<button type="button" id="wh_toc_button" class="custom-toggler navbar-toggler collapsed wh_toggle_button navbar-light" aria-expanded="false" aria-label="Toggle publishing table of content" aria-controls="wh_publication_toc">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</nav>
</div>
<div class="wh_content_area">
<div class="row">
<nav id="wh_publication_toc" class="col-lg-3 col-md-3 col-sm-12 d-md-block d-none d-print-none" aria-label="Table of Contents Container">
<div id="wh_publication_toc_content">
<div class=" wh_publication_toc " data-tooltip-position="right"><span class="expand-button-action-labels"><span id="button-expand-action" role="button" aria-label="Expand"></span><span id="button-collapse-action" role="button" aria-label="Collapse"></span><span id="button-pending-action" role="button" aria-label="Pending"></span></span><ul role="tree" aria-label="Table of Contents"><li role="treeitem"><div data-tocid="revinfo_linux-d5856e989" class="topicref" data-id="revinfo_linux" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/revinfo/revinfo_rtos.html" id="revinfo_linux-d5856e989-link">修订记录</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e1003" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e1003-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/env/sdk-compile.html" id="id-d5856e1003-link">SDK 编译</a><div class="wh-tooltip"><p class="shortdesc">介绍不同编译环境下 SDK 的详细编译流程。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e1152" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e1152-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/advanced/sdk-usage.html" id="id-d5856e1152-link">使用指南</a><div class="wh-tooltip"><p class="shortdesc">系统镜像、编译选项、开发板、应用等相关的详细使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_rcx_czh_pzb-d5856e1416" class="topicref" data-id="concept_rcx_czh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_rcx_czh_pzb-d5856e1416-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/chapter-app.html" id="concept_rcx_czh_pzb-d5856e1416-link">应用场景</a><div class="wh-tooltip"><p class="shortdesc">描述了 SDK 在不同应用场景中的配置和使用，包括系统更新、OTA、安全方案等。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2119" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2119-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/peripheral/peripheral-intro.html" id="id-d5856e2119-link">外设移植</a><div class="wh-tooltip"><p class="shortdesc"><span class="ph">CTP、U 盘、SD 卡、有线和无线网络</span>等外设的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2244" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2244-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/bringup/chapter-bringup.html" id="id-d5856e2244-link">BringUp</a><div class="wh-tooltip"><p class="shortdesc">在硬件上电后快速初始化系统，为操作系统的启动准备好必要的硬件环境。</p></div></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="id-d5856e2345" class="topicref" data-id="id" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action id-d5856e2345-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/chapter-advanced-app.html" id="id-d5856e2345-link">高级应用</a><div class="wh-tooltip"><p class="shortdesc">系统、存储、多媒体、接口、安全等模块的详细配置和设计说明。</p></div></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="_0-d5856e2360" class="topicref" data-id="_0" data-state="not-ready"><spa
</div>
</nav>
<div class="col-lg-7 col-md-9 col-sm-12" id="wh_topic_body">
<button id="wh_close_publication_toc_button" class="close-toc-button d-none" aria-label="Toggle publishing table of content" aria-controls="wh_publication_toc" aria-expanded="true">
<span class="close-toc-icon-container">
<span class="close-toc-icon"></span>
</span>
</button>
<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">15 Jan 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 &amp; SDIO &amp; 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/en
<p class="- topic/p p" data-ofbid="d126960e106__20250121171602">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="d126960e109__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e111__20250121171602">SDCard 是 1998 年由松下、东芝和 SanDisk 合作发布</p>
</li><li class="- topic/li li" data-ofbid="d126960e114__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e116__20250121171602">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="d126960e119__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e121__20250121171602">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="d126960e124__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e126__20250121171602">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="d126960e129__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e131__20250121171602">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="d126960e134__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e136__20250121171602">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="d126960e145__20250121171602">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="d126960e190__20250121171602">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="d126960e194__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e196__20250121171602">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="d126960e199__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e201__20250121171602">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="d126960e204__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e206__20250121171602">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="d126960e212__20250121171602">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="d126960e216__20250121171602">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="d126960e238__20250121171602">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="d126960e242__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e244__20250121171602">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="d126960e247__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e249__20250121171602">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="d126960e253__20250121171602">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="d126960e267__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e269__20250121171602">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="d126960e272__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e274__20250121171602">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="d126960e277__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e279__20250121171602">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="d126960e289__20250121171602">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="d126960e300__20250121171602">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="d126960e305__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e307__20250121171602">支持 eMMC5.0，SD3.01 和 SDIO3.0，向下兼容</p>
</li><li class="- topic/li li" data-ofbid="d126960e310__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e312__20250121171602">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="d126960e315__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e317__20250121171602">支持 3.3V 工作电压</p>
</li><li class="- topic/li li" data-ofbid="d126960e320__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e322__20250121171602">支持 DDR 4 线和 8 线模式</p>
</li><li class="- topic/li li" data-ofbid="d126960e325__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e327__20250121171602">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="d126960e330__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e332__20250121171602">支持 FIFO 深度为 128，FIFO 位宽为 32 bit</p>
</li><li class="- topic/li li" data-ofbid="d126960e335__20250121171602">
<p class="- topic/p p" data-ofbid="d126960e337__20250121171602">支持 CRC 生成和错误检测</p>
</li></ul>
</section></div></article></main></div>
<div class=" wh_child_links d-print-none "><nav aria-label="Child Links" role="navigation" class="- topic/related-links related-links"><ul class="ullinks"><li class="- topic/link link ulchildlink"><strong><a href="../../../topics/sdk/sdmc/sdmc-config-lite.html">SDMC 配置</a></strong></li><li class="- topic/link link ulchildlink"><strong><a href="../../../topics/sdk/sdmc/sdmc-debug_guide-lite.html">调试指南</a></strong></li><li class="- topic/link link ulchildlink"><strong><a href="../../../topics/sdk/sdmc/sdmc-test-guide-lite.html">测试指南</a></strong></li><li class="- topic/link link ulchildlink"><strong><a href="../../../topics/sdk/sdmc/sdmc-design-guide-lite.html">设计说明</a></strong></li><li class="- topic/link link ulchildlink"><strong><a href="../../../topics/sdk/sdmc/sdmc-faq_2.html">常见问题</a></strong></li></ul></nav></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>
Reference in New Issue Copy Permalink