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< 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-d3752e463" 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-d3752e463-link" > 修订记录< / a > < / div > < / div > < / li > < li role = "treeitem" aria-expanded = "false" > < div data-tocid = "id-d3752e480" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3752e480-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/env/sdk-compile.html" id = "id-d3752e480-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-d3752e604" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3752e604-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/advanced/sdk-usage.html" id = "id-d3752e604-link" > 使用指南< / a > < div class = "wh-tooltip" > < p class = "shortdesc" > 命令详解，编译选项，镜像和分区配置，添加应用和驱动等的详细使用说明。< / p > < / div > < / div > < / div > < / li > < li role = "treeitem" aria-expanded = "false" > < div data-tocid = "concept_rcx_czh_pzb-d3752e1004" 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-d3752e1004-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/chapter-app.html" id = "concept_rcx_czh_pzb-d3752e1004-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， < / p > < / div > < / div > < / div > < / li > < li role = "treeitem" aria-expanded = "false" > < div data-tocid = "id-d3752e1848" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3752e1848-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/peripheral/peripheral-intro.html" id = "id-d3752e1848-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-d3752e2022" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3752e2022-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/bringup/chapter-bringup.html" id = "id-d3752e2022-link" > BringUp< / a > < div class = "wh-tooltip" > < p class = "shortdesc" > 主要描述板卡的各项配置，使 SDK 的环境和板卡匹配，并确保 SDK 编译后的固件能够在板子上正常运行。< / p > < / div > < / div > < / div > < / li > < li role = "treeitem" aria-expanded = "true" > < div data-tocid = "id-d3752e2418" class = "topicref" data-id = "id" data-state = "expanded" > < span role = "button" tabindex = "0" aria-labelledby = "button-collapse-action id-d3752e2418-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/chapter-advanced-app.html" id = "id-d3752e2418-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-d3752e2435" class
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< span class = "edit-link" style = "font-size:12px; opacity:0.6; text-align:right; vertical-align:middle" > < a target = "_blank" href = "http://aicdocco/taskstopics/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 >
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< div class = "date inPage" > 16 May 2025< / div > < div style = "color: gray;" >
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Read time: 3 minute(s)
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< 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" >
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< th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e49__20250519091518" > 术语< / p > < / th >
< th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e53__20250519091518" > 定义< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-1" id = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e57__20250519091518" > 注释说明< / p > < / th >
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< / tr >
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< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e67__20250519091518" > SD< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e71__20250519091518" > Secure Digital< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e75__20250519091518" > Flash 存储卡的一种标准，即常见的 SD 卡< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e82__20250519091518" > SDCard< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e86__20250519091518" > Secure Digital Memory Card< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e90__20250519091518" > 安全数码卡， < / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e97__20250519091518" > MMC< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e101__20250519091518" > Multi Media Card< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e105__20250519091518" > 多媒体卡< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e112__20250519091518" > eMMC< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e116__20250519091518" > Embedded Multi Media Card< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e120__20250519091518" > 内嵌（在板卡上）式多媒体卡< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e127__20250519091518" > SDIO< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e131__20250519091518" > Secure Digital Input and Output< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e135__20250519091518" > 安全数字输入输出接口< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e143__20250519091518" > SDMC< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e147__20250519091518" > SDCard & SDIO & eMMC Host Contollor< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e151__20250519091518" > SD 卡/eMMC 主控制器< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e158__20250519091518" > CMD< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e162__20250519091518" > Command< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e166__20250519091518" > SD/eMMC 协议的命令< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e173__20250519091518" > DMA< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e177__20250519091518" > Direct Memory Access< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e181__20250519091518" > 直接存储器访问< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_n2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e188__20250519091518" > SPI< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_n2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e192__20250519091518" > Serial Peripheral Interface< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_n2m_pxh_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d125825e196__20250519091518" > 串行外设接口< / p > < / td >
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< / tr >
< / tbody > < / table > < / div >
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< p class = "- topic/p p" data-ofbid = "d125825e203__20250519091518" > 其中：< / p >
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< ul class = "- topic/ul ul simple" id = "id__ul_o2m_pxh_bdc" data-ofbid = "id__ul_o2m_pxh_bdc" >
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< li class = "- topic/li li" data-ofbid = "d125825e208__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e210__20250519091518" > MMC 是最早的记忆卡标准， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e214__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e216__20250519091518" > SDCard 是 1998 年由松下、东芝和 SanDisk 合作发布< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e220__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e222__20250519091518" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e226__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e228__20250519091518" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e232__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e234__20250519091518" > SD 卡后续还有 SDHC（ ， ， ） （ ， ） ，
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SD、SDHC、SDXC 统称为 SD< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e239__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e241__20250519091518" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e245__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e247__20250519091518" > eMMC 可以看作一个集合， ： < / p >
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< / 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 >
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< p class = "- topic/p p" data-ofbid = "d125825e259__20250519091518" > SDMC V1.0 可用于访问三种标准协议： ， ， ： < / p >
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< 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" >
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< th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__table_p2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e275__20250519091518" > SDMC< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-1" id = "id__table_p2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e279__20250519091518" > 支持功能< / p > < / th >
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< / tr >
< / thead > < tbody class = "- topic/tbody tbody" >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_p2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e289__20250519091518" > SDMC0< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_p2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e293__20250519091518" > SDCard、 eMMC< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_p2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e300__20250519091518" > SDMC1< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_p2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e304__20250519091518" > SDCard< / p > < / td >
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< / tr >
< tr class = "- topic/row" >
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< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_p2m_pxh_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d125825e311__20250519091518" > SDMC2< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_p2m_pxh_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d125825e315__20250519091518" > SDIO< / p > < / td >
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< / 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 >
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< p class = "- topic/p p" data-ofbid = "d125825e342__20250519091518" > SD/SDIO 的传输模式有三种：< / p >
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< ol class = "- topic/ol ol arabic simple" id = "id__ol_r2m_pxh_bdc" data-ofbid = "id__ol_r2m_pxh_bdc" >
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< li class = "- topic/li li" data-ofbid = "d125825e347__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e349__20250519091518" > SPI 模式：为了兼容性考虑，此模式属于 required， ， ，
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MB/s。广泛用于 MP3 等对读卡速度要求不高的场景。< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e353__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e355__20250519091518" > 1bit 模式：时钟最高 25 MHz， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e359__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e361__20250519091518" > 4bit 模式：读写时钟最高可达 50 MHz， ， < strong class = "+ topic/ph hi-d/b ph b" > SD 的主要模式< / strong > < / p >
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< / li >
< / ol >
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< p class = "- topic/p p" data-ofbid = "d125825e368__20250519091518" > 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 = "d125825e372__20250519091518" > 下表是三种传输模式对应的接口信号线定义：< / p >
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< 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 >
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< p class = "- topic/p p" data-ofbid = "d125825e405__20250519091518" > 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 >
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< ol class = "- topic/ol ol arabic simple" id = "id__ol_u2m_pxh_bdc" data-ofbid = "id__ol_u2m_pxh_bdc" >
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< li class = "- topic/li li" data-ofbid = "d125825e410__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e412__20250519091518" > 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， ， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e416__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e418__20250519091518" > 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 >
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< / li >
< / ol >
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< p class = "- topic/p p" data-ofbid = "d125825e423__20250519091518" > MMC 模式从传输速率上看又可以分为以下几种：< / p >
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< 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 >
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< 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 >
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< ol class = "- topic/ol ol arabic simple" id = "id__ol_w2m_pxh_bdc" data-ofbid = "id__ol_w2m_pxh_bdc" >
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< li class = "- topic/li li" data-ofbid = "d125825e443__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e445__20250519091518" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e449__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e451__20250519091518" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e455__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e457__20250519091518" > eMMC 芯片不支持 SPI 模式。< / p >
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< / li >
< / ol >
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< / div >
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< / 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 >
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< p class = "- topic/p p" data-ofbid = "d125825e469__20250519091518" > SDMC 支持的最大接口频率为 200 MHz， < / p >
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< 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" >
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< p class = "- topic/p p" data-ofbid = "d125825e485__20250519091518" > SDMC 支持的特性有：< / p >
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< / 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" >
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< li class = "- topic/li li" data-ofbid = "d125825e492__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e494__20250519091518" > 支持 eMMC5.0， < / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e498__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e500__20250519091518" > 支持 eMMC SDR/DDR 模式，接口时钟频率最大 200 MHz< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e504__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e506__20250519091518" > 支持 3.3V 工作电压< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e510__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e512__20250519091518" > 支持 DDR 4 线和 8 线模式< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e516__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e518__20250519091518" > 使用内部 DMA 模式，支持单通道、双缓存和描述符链表传输< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d125825e523__20250519091518" >
< p class = "- topic/p p" data-ofbid = "d125825e525__20250519091518" > 支持 FIFO 深度为 128， < / p >
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< / li >
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< p class = "- topic/p p" data-ofbid = "d125825e531__20250519091518" > 支持 CRC 生成和错误检测< / p >
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< 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.html" > 常见问题< / a > < / strong > < / li > < / ul > < / nav > < / div >
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< 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 >
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Update Time: 2025-05-19
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