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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-packet.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Packet</h1><div class="date inPage">21 Nov 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="d152187e23__20250121171612">通常一个 Packet 由 5 个部分组成。<ul class="- topic/ul ul" id="usb_packet__ul_bzn_f2q_g1c" data-ofbid="usb_packet__ul_bzn_f2q_g1c"><li class="- topic/li li" data-ofbid="d152187e26__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e28__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">PID</code> : Packet ID</p>
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</li><li class="- topic/li li" data-ofbid="d152187e33__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e35__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">ADDR</code> : Device Address</p>
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</li><li class="- topic/li li" data-ofbid="d152187e40__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e42__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">EP</code> : Endpoint Number</p>
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</li><li class="- topic/li li" data-ofbid="d152187e47__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e49__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">Payload DATA</code></p>
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</li><li class="- topic/li li" data-ofbid="d152187e53__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e55__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">CRC</code> ： 5/16 bits CRC</p>
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</li></ul></div><p class="- topic/p p" data-ofbid="d152187e60__20250121171612">以下是四种 Packet 的具体格式。</p><section class="- topic/section section" id="usb_packet__section_tg3_jfq_g1c" data-ofbid="usb_packet__section_tg3_jfq_g1c"><h2 class="- topic/title title sectiontitle">Token Packet </h2>
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<div class="- topic/p p" data-ofbid="d152187e67__20250121171612"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet__image_dzn_f2q_g1c" src="../../../images/usb/packet_token.png" alt="image6"/></div><br/></div>
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<div class="- topic/p p" data-ofbid="d152187e72__20250121171612">Token Packet 主要分四种：<ul class="- topic/ul ul" id="usb_packet__ul_ezn_f2q_g1c" data-ofbid="usb_packet__ul_ezn_f2q_g1c"><li class="- topic/li li" data-ofbid="d152187e75__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e77__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">IN</code>,</p>
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</li><li class="- topic/li li" data-ofbid="d152187e82__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e84__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">OUT</code>,</p>
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</li><li class="- topic/li li" data-ofbid="d152187e89__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e91__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">SETUP</code>,</p>
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</li><li class="- topic/li li" data-ofbid="d152187e96__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e98__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">SOF</code></p>
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</li></ul></div>
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</section><section class="- topic/section section" id="usb_packet__section_e1m_jfq_g1c" data-ofbid="usb_packet__section_e1m_jfq_g1c"><h2 class="- topic/title title sectiontitle">Data Packets</h2>
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<div class="- topic/p p" data-ofbid="d152187e108__20250121171612"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet__image_gzn_f2q_g1c" src="../../../images/usb/packet_data.png" alt="image7"/></div><br/></div>
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<div class="- topic/p p" data-ofbid="d152187e113__20250121171612">Data Packets 主要由三部分组成：<ul class="- topic/ul ul" id="usb_packet__ul_hzn_f2q_g1c" data-ofbid="usb_packet__ul_hzn_f2q_g1c"><li class="- topic/li li" data-ofbid="d152187e116__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e118__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">Packet ID</code> (DATA1/DATA0, toggle), -</p>
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</li><li class="- topic/li li" data-ofbid="d152187e123__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e125__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">Payload data</code>,</p>
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</li><li class="- topic/li li" data-ofbid="d152187e130__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e132__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">CRC16</code> 。</p>
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</li></ul></div>
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</section><section class="- topic/section section" id="usb_packet__section_z5m_jfq_g1c" data-ofbid="usb_packet__section_z5m_jfq_g1c"><h2 class="- topic/title title sectiontitle">Handshake Packets</h2>
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<div class="- topic/p p" data-ofbid="d152187e143__20250121171612"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet__image_jzn_f2q_g1c" src="../../../images/usb/packet_handshake.png" alt="image8"/></div><br/></div>
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<div class="- topic/p p" data-ofbid="d152187e148__20250121171612">Handshake Packets 主要有 4 种：<ul class="- topic/ul ul" id="usb_packet__ul_kzn_f2q_g1c" data-ofbid="usb_packet__ul_kzn_f2q_g1c"><li class="- topic/li li" data-ofbid="d152187e151__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e153__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">ACK</code> : 返回成功</p>
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</li><li class="- topic/li li" data-ofbid="d152187e158__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e160__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">NAK</code> : Device 忙，或者没有什么需要执行。</p>
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</li><li class="- topic/li li" data-ofbid="d152187e165__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e167__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">STALL</code> : Device 出错</p>
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</li><li class="- topic/li li" data-ofbid="d152187e172__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e174__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">NYET</code> : Host only, Not ready.</p>
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</li></ul></div>
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</section><section class="- topic/section section" id="usb_packet__section_pyn_jfq_g1c" data-ofbid="usb_packet__section_pyn_jfq_g1c"><h2 class="- topic/title title sectiontitle">Special Packet</h2>
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<figure class="- topic/fig fig fignone" id="usb_packet__fig_z1d_lfq_g1c" data-ofbid="usb_packet__fig_z1d_lfq_g1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet__image_mzn_f2q_g1c" src="../../../images/usb/packet_special.png" alt="image9"/></div><br/></figure>
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<ul class="- topic/ul ul" id="usb_packet__ul_nzn_f2q_g1c" data-ofbid="usb_packet__ul_nzn_f2q_g1c"><li class="- topic/li li" data-ofbid="d152187e191__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e193__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">PRE</code> : 由 Host 向 Hub 发送，指示下一个 packet 是 low speed</p>
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</li><li class="- topic/li li" data-ofbid="d152187e198__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e200__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">SPLIT</code> : Host only, split transaction</p>
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</li><li class="- topic/li li" data-ofbid="d152187e205__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e207__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">ERR</code> : Host only, 由 Hub 向 Host 发送，指示在一次 split transaction
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中出错</p>
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</li><li class="- topic/li li" data-ofbid="d152187e212__20250121171612">
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<p class="- topic/p p" data-ofbid="d152187e214__20250121171612"><code class="+ topic/ph pr-d/codeph ph codeph">PING</code> : Host only, check status</p>
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</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_packet__section_tg3_jfq_g1c" data-tocid="usb_packet__section_tg3_jfq_g1c">Token Packet </a></div></li><li class="section-item"><div class="section-title"><a href="#usb_packet__section_e1m_jfq_g1c" data-tocid="usb_packet__section_e1m_jfq_g1c">Data Packets</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_packet__section_z5m_jfq_g1c" data-tocid="usb_packet__section_z5m_jfq_g1c">Handshake Packets</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_packet__section_pyn_jfq_g1c" data-tocid="usb_packet__section_pyn_jfq_g1c">Special Packet</a></div></li></ul></div>
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