2025-09-30 11:56:06 +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， / > < 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， < / 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， < / 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 / en
< p class = "- topic/p p" data-ofbid = "d126960e106__20250121171602" > MMC 是最早的记忆卡标准， < / 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（ ， ， ） （ ， ） ，
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， ： < / 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： ， ， ： < / 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， ， ，
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， < / 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， ， < 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， ， < / 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， < / 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， < / 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， < / 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 >
2025-01-23 16:37:00 +08:00
< / html >
