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<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="Transfer / Frame (传输): 从时间的维度看，USB 通信是由一系列的 Transfer (传输)组成的。包括四种传输类型： Control Transfers 控制传输 Isochronous Transfers 同步传输 Interrupt Transfers 中断传输 Bulk Transfers 批量传输 Transaction (事务): 每一个 Transfer ..."/><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.creator" content="yan.wang"/><meta name="DC.date.created" content="2024-01-30"/><meta name="DC.date.modified" content="2024-02-29"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="usb_protocol_transfer_format"/><meta name="DC.language" content="zh-CN"/><title>USB 协议传输格式</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/usb/usb-protocol_transfer_format.dita"/><meta name="wh-out-relpath" content="topics/sdk/usb/usb-protocol_transfer_format_2.html"/>
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<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://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-protocol_transfer_format.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">USB 协议传输格式</h1><div class="date inPage">29 Feb 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d203425e23__20250121171636"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_protocol_transfer_format__image_nyn_f2q_g1c" src="../../../images/usb/usb_frame_format.png" alt="image1"/></div><br/></div><ul class="- topic/ul ul" id="usb_protocol_transfer_format__ul_oyn_f2q_g1c" data-ofbid="usb_protocol_transfer_format__ul_oyn_f2q_g1c"><li class="- topic/li li" data-ofbid="d203425e28__20250121171636"><p class="- topic/p p" data-ofbid="d203425e29__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Transfer</code>/<code class="+ topic/ph pr-d/codeph ph codeph">Frame</code> (传输): 从时间的维度看，USB 通信是由一系列的
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<code class="+ topic/ph pr-d/codeph ph codeph">Transfer</code> (传输)组成的。包括四种传输类型：</p><ul class="- topic/ul ul" id="usb_protocol_transfer_format__ul_pyn_f2q_g1c" data-ofbid="usb_protocol_transfer_format__ul_pyn_f2q_g1c"><li class="- topic/li li" data-ofbid="d203425e40__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e42__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Control Transfers</code> 控制传输</p>
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</li><li class="- topic/li li" data-ofbid="d203425e47__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e49__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Isochronous Transfers</code> 同步传输</p>
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</li><li class="- topic/li li" data-ofbid="d203425e54__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e56__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Interrupt Transfers</code> 中断传输</p>
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</li><li class="- topic/li li" data-ofbid="d203425e61__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e63__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Bulk Transfers</code> 批量传输</p>
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</li></ul><div class="- topic/p p" data-ofbid="d203425e68__20250121171636"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_protocol_transfer_format__image_qyn_f2q_g1c" src="../../../images/usb/usb_protocol_transfer.png" alt="image2"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d203425e72__20250121171636"><p class="- topic/p p" data-ofbid="d203425e73__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph"><a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="usb-transaction.html">Transaction</a></code> (事务): 每一个 <code class="+ topic/ph pr-d/codeph ph codeph">Transfer</code>
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(传输)又可以分成不同的 Transaction，具体的 Transaction 类型为以下 3 种：</p><ul class="- topic/ul ul" id="usb_protocol_transfer_format__ul_syn_f2q_g1c" data-ofbid="usb_protocol_transfer_format__ul_syn_f2q_g1c"><li class="- topic/li li" data-ofbid="d203425e83__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e85__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">IN/Read/Upstream Transaction</code> 输入 (Host) 事务</p>
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</li><li class="- topic/li li" data-ofbid="d203425e90__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e92__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">OUT/Write/Downstream Transaction</code> 输出 (Host) 事务</p>
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</li><li class="- topic/li li" data-ofbid="d203425e97__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e99__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Control Transaction</code> 控制事务</p>
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</li></ul><div class="- topic/p p" data-ofbid="d203425e104__20250121171636"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_protocol_transfer_format__image_tyn_f2q_g1c" src="../../../images/usb/usb_protocol_transaction.png" alt="image3"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d203425e108__20250121171636"><p class="- topic/p p" data-ofbid="d203425e109__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph"><a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="usb-packet.html">Packet</a></code> 每一次 Transaction 又由不同的 Packets
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所组成</p><ul class="- topic/ul ul" id="usb_protocol_transfer_format__ul_vyn_f2q_g1c" data-ofbid="usb_protocol_transfer_format__ul_vyn_f2q_g1c"><li class="- topic/li li" data-ofbid="d203425e116__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e118__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Token Packet</code></p>
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</li><li class="- topic/li li" data-ofbid="d203425e122__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e124__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Data Packet</code></p>
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</li><li class="- topic/li li" data-ofbid="d203425e128__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e130__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Handshake Packet</code></p>
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</li><li class="- topic/li li" data-ofbid="d203425e134__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e136__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Special Packet</code></p>
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</li></ul><div class="- topic/p p" data-ofbid="d203425e140__20250121171636"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_protocol_transfer_format__image_wyn_f2q_g1c" src="../../../images/usb/usb_protocol_packet.png" alt="image4"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d203425e144__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e146__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Field</code> 每一个 Packet 又由不同的 Field 组成：</p>
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<ul class="- topic/ul ul" id="usb_protocol_transfer_format__ul_yyn_f2q_g1c" data-ofbid="usb_protocol_transfer_format__ul_yyn_f2q_g1c"><li class="- topic/li li" data-ofbid="d203425e152__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e154__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">Sync</code> 同步域</p>
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</li><li class="- topic/li li" data-ofbid="d203425e159__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e161__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">PID</code> 标识域</p>
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</li><li class="- topic/li li" data-ofbid="d203425e166__20250121171636">
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<p class="- topic/p p" data-ofbid="d203425e168__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">ADDR</code> 设备地址域</p>
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<p class="- topic/p p" data-ofbid="d203425e175__20250121171636"><code class="+ topic/ph pr-d/codeph ph codeph">ENDP</code> 端点域</p>
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</li></ul>
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<div class="- topic/p p" data-ofbid="d203425e202__20250121171636"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_protocol_transfer_format__image_azn_f2q_g1c" src="../../../images/usb/usb_packet_format1.png" alt="image5"/></div><br/></div>
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