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<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/mdi/mdi_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">MDI 使用指南</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body body"><p class="- topic/p p" data-ofbid="d259907e20__20250121171720">Multi-Display Interface (MDI) 模块负责从外部 MCU 等系统中获取到数据，采集图像信号并输出到 RAM，然后转交给 Display Engine
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(DE) 去显示。在这种应用场景中，“外部 MCU” 属于 Host 角色，使用 MDI 接口的 <strong class="+ topic/ph hi-d/b ph b">SoC 是 Device 角色</strong>，例如 D12x，功能上相当于一颗
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“屏驱芯片”。</p><div class="table-container"><table class="- topic/table table frame-all" id="id__table_lny_brt_2dc" data-ofbid="id__table_lny_brt_2dc" 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:20%"/><col style="width:40.599999999999994%"/><col style="width:39.4%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_lny_brt_2dc__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_lny_brt_2dc__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_lny_brt_2dc__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_lny_brt_2dc__entry__1">CMA</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">Contiguous Memory Allocator</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">连续内存分配器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__1">DBI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">Display Bus Interface</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">显示总线接口</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__1">DPI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">Display Pixel Interface</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">显示像素接口</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__1">MDI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">MCU Display Input</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">用于接收 MCU 视频数据</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__1">VBI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">Vertical Blanking Interval</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">垂直消隐期</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__1">MPP</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lny_brt_2dc__entry__2">Media Process Platform</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lny_brt_2dc__entry__3">通用多媒体处理软件平台</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_lny_brt_2dc__entry__1">VIN</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_lny_brt_2dc__entry__2">Video Input</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_lny_brt_2dc__entry__3">视频输入（采集）模块</td></tr></tbody></table></div><section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">模块特性</h2>
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<p class="- topic/p p" data-ofbid="d259907e95__20250121171720">MDI 特性：</p>
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<ul class="- topic/ul ul simple" id="id__ul_mny_brt_2dc" data-ofbid="id__ul_mny_brt_2dc"><li class="- topic/li li" data-ofbid="d259907e99__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e101__20250121171720">支持 8080 8/16bit 并口协议</p>
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</li><li class="- topic/li li" data-ofbid="d259907e104__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e106__20250121171720">支持 6800 8/16bit 并口协议</p>
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</li><li class="- topic/li li" data-ofbid="d259907e109__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e111__20250121171720">支持 3/4-wire SPI、2-SDA、4-SDA SPI 协议</p>
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</li><li class="- topic/li li" data-ofbid="d259907e114__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e116__20250121171720">8080/6800 8/16bit 支持最高 50 MHz 接口时钟频率</p>
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</li><li class="- topic/li li" data-ofbid="d259907e119__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e121__20250121171720">3/4-wire SPI、2-SDA、4-SDA SPI 支持最高 100 MHz 接口时钟频率</p>
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</li><li class="- topic/li li" data-ofbid="d259907e124__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e126__20250121171720">支持自定义的读写命令及数据</p>
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</li><li class="- topic/li li" data-ofbid="d259907e129__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e131__20250121171720">支持和 GE 配合完成旋转、缩放效果</p>
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</li><li class="- topic/li li" data-ofbid="d259907e134__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e136__20250121171720">支持局部刷新</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d259907e140__20250121171720">MDI 硬件框图：</p>
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<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_nny_brt_2dc" src="../../../images/mdi/mdi_overview_block.png" alt="mdi_overview_block"/></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">MDI 硬件架构示意图</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d259907e151__20250121171720">根据输入的图像格式，MDI 的数据流处理有两种情况：</p>
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<ol class="- topic/ol ol arabic simple" id="id__ol_ony_brt_2dc" data-ofbid="id__ol_ony_brt_2dc"><li class="- topic/li li" data-ofbid="d259907e155__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e157__20250121171720">从接口收到图像数据，按原始尺寸转交 DE 显示到屏幕上；</p>
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</li><li class="- topic/li li" data-ofbid="d259907e160__20250121171720">
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<p class="- topic/p p" data-ofbid="d259907e162__20250121171720">从接口收到 <strong class="+ topic/ph hi-d/b ph b">GE Ctrl 命令</strong> 和 图像数据，会先调用 GE 将输入图像做满屏的缩放和旋转，然后转接 DE 显示到屏幕上。</p>
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</li></ol>
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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_pny_brt_2dc" src="../../../images/mdi/mdi_data_flow.png" alt="mdi_data_flow"/></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">MDI 应用场景的数据流示意图</span></figcaption></figure>
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