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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-transaction.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Transaction</h1><div class="date inPage">4 Feb 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d272926e22__20250121171745">USB Transactions 主要由四种 Packet 组成： <code class="+ topic/ph pr-d/codeph ph codeph">Token Packet</code> 、 <code class="+ topic/ph pr-d/codeph ph codeph">Data
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Packet</code> 、 <code class="+ topic/ph pr-d/codeph ph codeph">Handshake Packet</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">Special
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Packet</code> 。但通常的一次 <code class="+ topic/ph pr-d/codeph ph codeph">Transaction</code> 由 3 个 Packets 组成：
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<code class="+ topic/ph pr-d/codeph ph codeph">Token</code> -> <code class="+ topic/ph pr-d/codeph ph codeph">Data</code> -> <code class="+ topic/ph pr-d/codeph ph codeph">Handshake</code>。</p><div class="- topic/p p" data-ofbid="d272926e49__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_mqk_rfq_g1c" src="../../../images/usb/usb_transaction_format.png" alt="image10"/></div><br/></div><section class="- topic/section section" id="usb_transaction__section_qm2_sfq_g1c" data-ofbid="usb_transaction__section_qm2_sfq_g1c"><h2 class="- topic/title title sectiontitle">IN/Read/Upstream Transaction</h2>
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<div class="- topic/p p" data-ofbid="d272926e58__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_rm2_sfq_g1c" src="../../../images/usb/transaction_in.png" alt="image11"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d272926e63__20250121171745">IN Transaction 主要用于 Device 向 Host 发送数据。</p>
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<ul class="- topic/ul ul" id="usb_transaction__ul_sm2_sfq_g1c" data-ofbid="usb_transaction__ul_sm2_sfq_g1c"><li class="- topic/li li" data-ofbid="d272926e67__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e69__20250121171745">Host 向 Deivce 发送一个 <code class="+ topic/ph pr-d/codeph ph codeph">IN Token Packet</code></p>
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</li><li class="- topic/li li" data-ofbid="d272926e74__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e76__20250121171745">Device 如果忙，则回复 <code class="+ topic/ph pr-d/codeph ph codeph">NAK Packet</code>, Host 在收到 <code class="+ topic/ph pr-d/codeph ph codeph">NAK
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Pakcet</code> 之后则持续向 Device 发送 <code class="+ topic/ph pr-d/codeph ph codeph">IN Token Packet</code> 。</p>
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</li><li class="- topic/li li" data-ofbid="d272926e88__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e90__20250121171745">当 Device 准备好时，回复 <code class="+ topic/ph pr-d/codeph ph codeph">Data Packet</code>, Host 在收到 <code class="+ topic/ph pr-d/codeph ph codeph">Data
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packet</code> 之后回复一个 <code class="+ topic/ph pr-d/codeph ph codeph">ACK handshake</code> 。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_transaction__section_tm2_sfq_g1c" data-ofbid="usb_transaction__section_tm2_sfq_g1c"><h2 class="- topic/title title sectiontitle">OUT/Write/Downstream Transaction</h2>
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<div class="- topic/p p" data-ofbid="d272926e108__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_um2_sfq_g1c" src="../../../images/usb/transaction_out.png" alt="image12"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d272926e113__20250121171745">OUT Transaction 主要用于 Host 向 Device 发送数据。</p>
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<ul class="- topic/ul ul" id="usb_transaction__ul_vm2_sfq_g1c" data-ofbid="usb_transaction__ul_vm2_sfq_g1c"><li class="- topic/li li" data-ofbid="d272926e117__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e119__20250121171745">Host 向 Deivce 发送一个 <code class="+ topic/ph pr-d/codeph ph codeph">OUT Token Packet</code> 和一个 <code class="+ topic/ph pr-d/codeph ph codeph">DATA
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Packet</code> 。</p>
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</li><li class="- topic/li li" data-ofbid="d272926e128__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e130__20250121171745">Device 忙，则回 <code class="+ topic/ph pr-d/codeph ph codeph">NAK</code>, Host 则会复发 <code class="+ topic/ph pr-d/codeph ph codeph">OUT</code> 和
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<code class="+ topic/ph pr-d/codeph ph codeph">DATA</code></p>
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</li><li class="- topic/li li" data-ofbid="d272926e141__20250121171745">
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<p class="- topic/p p" data-ofbid="d272926e143__20250121171745">Device 在成功收到数据后，回 <code class="+ topic/ph pr-d/codeph ph codeph">ACK handshake packet</code> 。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_transaction__section_wm2_sfq_g1c" data-ofbid="usb_transaction__section_wm2_sfq_g1c"><h2 class="- topic/title title sectiontitle">Control Transaction</h2>
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<p class="- topic/p p" data-ofbid="d272926e155__20250121171745"><code class="+ topic/ph pr-d/codeph ph codeph">Control Transaction</code> 最多由 3 个 Stage 组成： <code class="+ topic/ph pr-d/codeph ph codeph">Setup stage</code> 、
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<code class="+ topic/ph pr-d/codeph ph codeph">Data stage</code> 、 <code class="+ topic/ph pr-d/codeph ph codeph">Status stage</code> 。其中 <code class="+ topic/ph pr-d/codeph ph codeph">Data
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stage</code> 不是必需的，有的 <code class="+ topic/ph pr-d/codeph ph codeph">control transaction</code> 没有 <code class="+ topic/ph pr-d/codeph ph codeph">data
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stage</code> 。</p>
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<ul class="- topic/ul ul" id="usb_transaction__ul_fsw_5fq_g1c" data-ofbid="usb_transaction__ul_fsw_5fq_g1c"><li class="- topic/li li" data-ofbid="d272926e180__20250121171745">Setup Stage (<code class="+ topic/ph pr-d/codeph ph codeph">Transaction</code>)<p class="- topic/p p" data-ofbid="d272926e185__20250121171745">Setup stage 中的 setup packet 只会出现在
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control transaction 中，Device 必须回 ACK, 不能回 NAK。</p><div class="- topic/p p" data-ofbid="d272926e187__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_ym2_sfq_g1c" src="../../../images/usb/transaction_ctl_setup.png" alt="image13"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d272926e191__20250121171745">Data Stage (<code class="+ topic/ph pr-d/codeph ph codeph">Transaction</code>)<p class="- topic/p p" data-ofbid="d272926e196__20250121171745">Data Stage 可以有若干的 Data
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transaction。这个 stage 只有在 Host 和 Device 需要 data 传输时才会存在，通常 setup stage 的
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payload 可以 cover , 这个时候就不需要 data stage。</p><div class="- topic/p p" data-ofbid="d272926e198__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_an2_sfq_g1c" src="../../../images/usb/transaction_ctl_data.png" alt="image14"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d272926e202__20250121171745">Status Stage (<code class="+ topic/ph pr-d/codeph ph codeph">Transaction</code>)<p class="- topic/p p" data-ofbid="d272926e207__20250121171745">以下是 control read transaction 和
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control write tranasaction 分别对应的 status stage。</p><div class="- topic/p p" data-ofbid="d272926e209__20250121171745"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_transaction__image_cn2_sfq_g1c" src="../../../images/usb/transaction_ctl_status.png" alt="image15"/></div><br/></div></li></ul>
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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="#usb_transaction__section_qm2_sfq_g1c" data-tocid="usb_transaction__section_qm2_sfq_g1c">IN/Read/Upstream Transaction</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_transaction__section_tm2_sfq_g1c" data-tocid="usb_transaction__section_tm2_sfq_g1c">OUT/Write/Downstream Transaction</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_transaction__section_wm2_sfq_g1c" data-tocid="usb_transaction__section_wm2_sfq_g1c">Control Transaction</a></div></li></ul></div>
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