2025-04-23 17:54:31 +08:00
<!DOCTYPE html> < html xmlns = "http://www.w3.org/1999/xhtml" xml:lang = "zh-cn" lang = "zh-cn" data-whc_version = "26.1" >
< 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 = "Direction memory access (DMA) 模块提供一种高效的数据传输技术，能够在不受 CPU 干预的情况下进行设备间的数据传输，从而减少 CPU 负荷。CPU 使能 DMA 之后，就退出操作，由 DMA 独立自主控制数据传输。此外， / > < 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 = "concept" / > < meta name = "DC.relation" content = "../../../topics/chapter-title/chapter-system.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/cmu/cmu-interface-design-2.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/dma/dma-configuration.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/dma/dma-configuration.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/dma/dma-debug-guide.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/dma/dma-test-guide-lite.html" / > < meta name = "DC.relation" content = "../../../topics/sdk/dma/dma-design-guide-lite.html" / > < meta name = "DC.contributor" content = "yan.wang" / > < meta name = "DC.contributor" content = "yan.wang" / > < meta name = "DC.date.modified" content = "2025-04-09" / > < meta name = "DC.format" content = "HTML5" / > < meta name = "DC.identifier" content = "concept_or5_kn3_pzb" / > < meta name = "DC.language" content = "zh-CN" / > < title > DMA 使用指南< / title > < meta name = "wh-path2root" content = "../../../" / > < meta name = "wh-toc-id" content = "concept_or5_kn3_pzb-d3703e2868" / > < meta name = "wh-source-relpath" content = "topics/sdk/dma/dma-user-guide.dita" / > < meta name = "wh-out-relpath" content = "topics/sdk/dma/dma-user-guide.html" / >
2025-01-23 16:37:00 +08:00
2025-04-23 17:54:31 +08:00
< link rel = "stylesheet" type = "text/css" href = "../../../webhelp/app/commons.css?buildId=2024041900" / >
< link rel = "stylesheet" type = "text/css" href = "../../../webhelp/app/topic.css?buildId=2024041900" / >
2025-01-23 16:37:00 +08:00
2025-04-23 17:54:31 +08:00
< script src = "../../../webhelp/app/options/properties.js?buildId=20250409170918" > < / script >
< script src = "../../../webhelp/app/localization/strings.js?buildId=2024041900" > < / script >
< script src = "../../../webhelp/app/search/index/keywords.js?buildId=20250409170918" > < / script >
< script defer = "defer" src = "../../../webhelp/app/commons.js?buildId=2024041900" > < / script >
< script defer = "defer" src = "../../../webhelp/app/topic.js?buildId=2024041900" > < / script >
< link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/aic-styles-web-internal.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/notes.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/aic-common.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/aic-images.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/footnote.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/aic-highlight-changes.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/search-in-header.css?buildId=2024041900" / > < link rel = "stylesheet" type = "text/css" href = "../../../webhelp/template/css/topic-body-list.css?buildId=2024041900" / > < / head >
2025-01-23 16:37:00 +08:00
< body id = "concept_or5_kn3_pzb" 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" >
2025-04-23 17:54:31 +08:00
< div xmlns:whc = "http://www.oxygenxml.com/webhelp/components" class = "wh_header_flex_container navbar-nav navbar-expand-md navbar-dark" >
2025-01-23 16:37:00 +08:00
< div class = "wh_logo_and_publication_title_container" >
< div class = "wh_logo_and_publication_title" >
2025-04-23 17:54:31 +08:00
< a href = "https://www.artinchip.com" class = " wh_logo d-none d-sm-block " > < img src = "../../../company-logo.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 >
2025-01-23 16:37:00 +08:00
< / div >
< / div >
< div class = "wh_top_menu_and_indexterms_link collapse navbar-collapse" id = "wh_top_menu_and_indexterms_link" >
< / div >
< 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 >
2025-04-23 17:54:31 +08:00
< / div > < / div >
< / div >
< / header >
2025-01-23 16:37:00 +08:00
< div class = "container-fluid" id = "wh_topic_container" >
< div class = "row" >
< nav class = "wh_tools d-print-none navbar-expand-md" aria-label = "Tools" >
2025-04-23 17:54:31 +08:00
< 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-system" > < div class = "title" > < a href = "../../../topics/chapter-title/chapter-system.html" > 系统< / a > < div class = "wh-tooltip" > < p class = "shortdesc" > < / p > < / div > < / div > < / div > < / li > < li class = "active" > < div class = "topicref" data-id = "concept_or5_kn3_pzb" > < div class = "title" > < a href = "../../../topics/sdk/dma/dma-user-guide.html" > DMA 使用指南< / a > < / div > < / div > < / li > < / ol > < / div >
2025-01-23 16:37:00 +08:00
< 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 >
2025-04-23 17:54:31 +08:00
< div class = " wh_navigation_links " > < span id = "topic_navigation_links" class = "navheader" >
< span class = "navprev" > < a class = "- topic/link link" href = "../../../topics/sdk/cmu/cmu-interface-design-2.html" title = "接口设计" aria-label = "上一主题: 接口设计" rel = "prev" > < / a > < / span >
< span class = "navnext" > < a class = "- topic/link link" href = "../../../topics/sdk/dma/dma-configuration.html" title = "DMA 配置" aria-label = "下一主题: DMA 配置" rel = "next" > < / a > < / span > < / span > < / div >
2025-01-23 16:37:00 +08:00
< 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 >
2025-04-23 17:54:31 +08:00
< 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 >
2025-01-23 16:37:00 +08:00
< / div >
< / nav >
< / div >
< div class = "wh_content_area" >
< div class = "row" >
2025-04-23 17:54:31 +08:00
< 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-d3703e457" 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-d3703e457-link" > 修订记录< / a > < / div > < / div > < / li > < li role = "treeitem" aria-expanded = "false" > < div data-tocid = "id-d3703e479" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3703e479-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/env/sdk-compile.html" id = "id-d3703e479-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-d3703e601" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3703e601-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/advanced/sdk-usage.html" id = "id-d3703e601-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-d3703e1001" 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-d3703e1001-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/chapter-app.html" id = "concept_rcx_czh_pzb-d3703e1001-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-d3703e1841" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3703e1841-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/peripheral/peripheral-intro.html" id = "id-d3703e1841-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-d3703e2015" class = "topicref" data-id = "id" data-state = "not-ready" > < span role = "button" tabindex = "0" aria-labelledby = "button-expand-action id-d3703e2015-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/bringup/chapter-bringup.html" id = "id-d3703e2015-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-d3703e2355" class = "topicref" data-id = "id" data-state = "expanded" > < span role = "button" tabindex = "0" aria-labelledby = "button-collapse-action id-d3703e2355-link" class = "wh-expand-btn" > < / span > < div class = "title" > < a href = "../../../topics/sdk/chapter-advanced-app.html" id = "id-d3703e2355-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-d3703e2372" class = "topicref" data-id = "_0" data-state = "
< / div >
< / nav >
2025-01-23 16:37:00 +08:00
2025-04-23 17:54:31 +08:00
< div class = "col-lg-9 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 >
2025-01-23 16:37:00 +08:00
2025-04-23 17:54:31 +08:00
< div class = " wh_topic_content body " > < main role = "main" > < article class = "- topic/topic concept/concept topic concept" 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://aicdocco/taskstopics/sdk/dma/dma-user-guide.dita" > Edit online< / a > < / span > < h1 class = "- topic/title title topictitle1" id = "ariaid-title1" > DMA 使用指南< / h1 >
< div class = "date inPage" > 9 Apr 2025< / div > < div style = "color: gray;" >
2025-01-23 16:37:00 +08:00
Read time: 1 minute(s)
2025-04-23 17:54:31 +08:00
< / div >
< div class = "- topic/body concept/conbody body conbody" >
< div class = "- topic/p p" data-ofbid = "d208849e33__20250409171055" > Direction memory access (DMA) 模块提供一种高效的数据传输技术，能够在不受 CPU 干预的情况下进行设备间的数据传输，从而减少 CPU 负荷。CPU
使能 DMA 之后，就退出操作，由 DMA 独立自主控制数据传输。此外， < div class = "- topic/note note note note_note" id = "concept_or5_kn3_pzb__note_j3d_ywx_bdc" data-ofbid = "concept_or5_kn3_pzb__note_j3d_ywx_bdc" > < span class = "note__title" > 注：< / span > 关于 DMA 可以连接的设备列表，可查看具体产品型号对应的数据手册。关于 DMA 存储单元的详细说明，可查看具体产品型号用户手册的功能框图。< / div > < / div >
< div class = "- topic/note note note note_note" id = "concept_or5_kn3_pzb__note_ddj_kwj_bdc" data-ofbid = "concept_or5_kn3_pzb__note_ddj_kwj_bdc" > < span class = "note__title" > 注：< / span > USB、GMAC、eMMC 等模块具有内置的 DMA。为了方便区分，
的硬件模块。< / div >
< div class = "table-container" > < table class = "- topic/table table frame-all" id = "concept_or5_kn3_pzb__table_bdk_xwd_hzb" data-ofbid = "concept_or5_kn3_pzb__table_bdk_xwd_hzb" 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:25%" / > < col style = "width:37.5%" / > < col style = "width:37.5%" / > < / colgroup > < thead class = "- topic/thead thead" >
< tr class = "- topic/row" >
< th class = "- topic/entry entry colsep-0 rowsep-0" id = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e59__20250409171055" > 术语< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-0" id = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e63__20250409171055" > 定义< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-0" id = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e67__20250409171055" > 注释说明< / p > < / th >
< / tr >
< / thead > < tbody class = "- topic/tbody tbody" >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e77__20250409171055" > DMA< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e81__20250409171055" > Direct Memory Access< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e85__20250409171055" > 直接存储器访问< / p > < / td >
< / tr >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e92__20250409171055" > DRQ< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e96__20250409171055" > DMA Request< / p > < / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_bdk_xwd_hzb__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e100__20250409171055" > 指 DMA 请求的端口号< / p > < / td >
< / tr >
< / tbody > < / table > < / div >
< div class = "- topic/p p" data-ofbid = "d208849e107__20250409171055" > DMA 模块特性：< ul class = "- topic/ul ul" id = "concept_or5_kn3_pzb__ul_ddk_xwd_hzb" data-ofbid = "concept_or5_kn3_pzb__ul_ddk_xwd_hzb" >
< li class = "- topic/li li" data-ofbid = "d208849e111__20250409171055" >
< p class = "- topic/p p" data-ofbid = "d208849e113__20250409171055" > 支持八个 DMA 通道，每通道有 32 个源端和 32 个终端可选< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d208849e117__20250409171055" >
< p class = "- topic/p p" data-ofbid = "d208849e119__20250409171055" > 采用链表配置方式，寄存器描述通道状态< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d208849e123__20250409171055" >
< p class = "- topic/p p" data-ofbid = "d208849e125__20250409171055" > 设备位宽支持 8/ 16/ 32/ 64 位， < / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d208849e129__20250409171055" >
< p class = "- topic/p p" data-ofbid = "d208849e131__20250409171055" > DMA 源端、终端地址 8Byte 对齐< / p >
< / li >
< / ul > < / div >
< figure class = "- topic/fig fig fignone" id = "concept_or5_kn3_pzb__fig_qvh_1ks_c1c" data-ofbid = "concept_or5_kn3_pzb__fig_qvh_1ks_c1c" >
< div class = "- topic/p p" data-ofbid = "d208849e141__20250409171055" >
2025-01-23 16:37:00 +08:00
< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "concept_or5_kn3_pzb__image_ucv_yjs_c1c" src = "../../../images/dma/hw_system1.png" width = "384" alt = "dma_hw_system" / > < / div > < br / >
2025-04-23 17:54:31 +08:00
< / div >
< figcaption data-caption-side = "bottom" class = "- topic/title title figcap" > < 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" > DMA 硬件的原理框图< / span > < / figcaption > < / figure >
< p class = "- topic/p p" data-ofbid = "d208849e154__20250409171055" > 根据数据的源和目的，
操作分为以下几种情况：< / p >
< div class = "table-container" > < table class = "- topic/table table frame-all" id = "concept_or5_kn3_pzb__table_ncz_23d_bdc" data-ofbid = "concept_or5_kn3_pzb__table_ncz_23d_bdc" data-cols = "4" > < 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" > 2< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > DMA 操作定义< / span > < / caption > < colgroup > < col style = "width:4%" / > < col style = "width:16%" / > < col style = "width:40%" / > < col style = "width:40%" / > < / colgroup > < thead class = "- topic/thead thead" >
< tr class = "- topic/row" >
< th class = "- topic/entry entry colsep-1 rowsep-1" id = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e183__20250409171055" > -< / p > < / th >
< th class = "- topic/entry entry colsep-1 rowsep-1" id = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e187__20250409171055" > 内核中类型定义< / p > < / th >
< th class = "- topic/entry entry colsep-1 rowsep-1" id = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e191__20250409171055" > 含义< / p > < / th >
< th class = "- topic/entry entry colsep-0 rowsep-1" id = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__4" > < p class = "- topic/p p" data-ofbid = "d208849e195__20250409171055" > 特点< / p > < / th >
< / tr >
< / thead > < tbody class = "- topic/tbody tbody" >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e206__20250409171055" > 1< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e210__20250409171055" > DMA_MEM_TO_MEM< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e214__20250409171055" > 从内存到内存< / p > 将数据从一个内存区域复制到另一个内存区域（包括 DRAM、SRAM） ，
的硬件加速版本，用于高效地在内存中移动大量数据。< / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__4" > < p class = "- topic/p p" data-ofbid = "d208849e219__20250409171055" > 由于只涉及内存操作，不涉及设备，因此操作相对简单，不需要握手信号或 FIFO。< / p > < / td >
< / tr >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e226__20250409171055" > 2< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e230__20250409171055" > DMA_MEM_TO_DEV< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e234__20250409171055" > 从内存到设备< / p > 将数据从内存传输到设备，数据源是内存，而数据目的地是设备。这要求设备能够接收来自内存的数据，并可能需要一些控制逻辑来处理数据传输过程。< / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__4" > < p class = "- topic/p p" data-ofbid = "d208849e239__20250409171055" > 支持 DMA 操作的设备一般需要提供握手信号或 FIFO 来确保数据传输的正确性和同步性。< / p > < / td >
< / tr >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e246__20250409171055" > 3< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e250__20250409171055" > DMA_DEV_TO_MEM< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e254__20250409171055" > 从设备到内存< / p > 数据从设备传输到内存，是 DMA_MEM_TO_DEV
的逆操作，允许设备将其数据处理结果或其它信息直接写入内存。< / td >
< td class = "- topic/entry entry colsep-0 rowsep-1" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__4" > < p class = "- topic/p p" data-ofbid = "d208849e259__20250409171055" > 需要设备提供相应的握手信号或 FIFO 以确保数据传输的稳定性和正确性。< / p > < / td >
< / tr >
< tr class = "- topic/row" >
< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__1" > < p class = "- topic/p p" data-ofbid = "d208849e266__20250409171055" > 4< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__2" > < p class = "- topic/p p" data-ofbid = "d208849e270__20250409171055" > DMA_DEV_TO_DEV< / p > < / td >
< td class = "- topic/entry entry colsep-1 rowsep-0" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__3" > < p class = "- topic/p p" data-ofbid = "d208849e274__20250409171055" > 从设备到设备< / p > 将数据直接从一个设备传输到另一个设备，而不经过 CPU 或内存。< / td >
< td class = "- topic/entry entry colsep-0 rowsep-0" headers = "concept_or5_kn3_pzb__table_ncz_23d_bdc__entry__4" > < p class = "- topic/p p" data-ofbid = "d208849e279__20250409171055" > 要求两个设备之间有直接的数据通路，使用场景较少。< / p > < / td >
< / tr >
< / tbody > < / table > < / div >
< / div >
< / article > < / main > < / div >
2025-01-23 16:37:00 +08:00
2025-04-23 17:54:31 +08:00
< 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/dma/dma-configuration.html" > DMA 配置< / a > < / strong > < / li > < li class = "- topic/link link ulchildlink" > < strong > < a href = "../../../topics/sdk/dma/dma-debug-guide.html" > 调试指南< / a > < / strong > < / li > < li class = "- topic/link link ulchildlink" > < strong > < a href = "../../../topics/sdk/dma/dma-test-guide-lite.html" > 测试指南< / a > < / strong > < / li > < li class = "- topic/link link ulchildlink" > < strong > < a href = "../../../topics/sdk/dma/dma-design-guide-lite.html" > 设计说明< / a > < / strong > < / li > < / ul > < / nav > < / div >
2025-01-23 16:37:00 +08:00
< / div >
< / div >
< / div >
< / div >
< footer class = "navbar navbar-default wh_footer" >
< div class = " footer-container mx-auto " >
< title > footer def< / title >
2025-04-23 17:54:31 +08:00
< style >
2025-01-23 16:37:00 +08:00
.p1 {
font-family: FangZhengShuSong, Times, serif;
}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
2025-04-23 17:54:31 +08:00
< / style >
2025-01-23 16:37:00 +08:00
< div class = "webhelp.fragment.footer" >
2025-04-23 17:54:31 +08:00
< p class = "p1" > Copyright © 2019-2025 广东匠芯创科技有限公司. All rights reserved.< / p >
< / div >
< div >
2025-01-23 16:37:00 +08:00
< div class = "generation_time" >
2025-04-23 17:54:31 +08:00
Update Time: 2025-04-09
2025-01-23 16:37:00 +08:00
< / div >
2025-04-23 17:54:31 +08:00
< / div >
2025-01-23 16:37:00 +08:00
< / 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 >
