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使用指南</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="usb_configuration-d4445e7313" class="topicref" data-id="usb_configuration" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_configuration-d4445e7313-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_config.html" id="usb_configuration-d4445e7313-link">USB 配置</a></div></div></li><li role="treeitem"><div data-tocid="usb_debug_guide-d4445e7369" class="topicref" data-id="usb_debug_guide" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-debug_guide.html" id="usb_debug_guide-d4445e7369-link">调试指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_test_guide-d4445e7383" class="topicref" data-id="usb_test_guide" data-state="not-ready"><span role="button" tabindex="0" 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class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host_subsystem_code_structure.html" id="usb_host_subsystem_code_structure-d4445e7594-link">USB Host 子系统代码架构</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="usb_host_core-d4445e7608" class="topicref" data-id="usb_host_core" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-core.html" id="usb_host_core-d4445e7608-link">USB Core</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_device_layer-d4445e7622" class="topicref" data-id="usb_host_device_layer" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-device_layer.html" id="usb_host_device_layer-d4445e7622-link">USB Device Layer</a></div></div></li><li role="treeitem" aria-expanded="false"><div 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href="../../../topics/sdk/usb/usb-host-ehci_driver.html" id="usb_host_ehci_driver-d4445e7748-link">EHCI Driver</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_device_subsystem_code_structure-d4445e7762" class="topicref" data-id="usb_device_subsystem_code_structure" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_device_subsystem_code_structure-d4445e7762-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device_subsystem_code_structure.html" id="usb_device_subsystem_code_structure-d4445e7762-link">USB Device 子系统代码架构</a></div></div></li><li role="treeitem"><div data-tocid="usb_common_issues-d4445e7930" class="topicref" data-id="usb_common_issues" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_faq.html" id="usb_common_issues-d4445e7930-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-host-ehci_internal_structure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">EHCI 内部结构</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d164387e33__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_f3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule.png" alt="image8"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d164387e40__20250123155217">EHCI 的核心就是把数据传输分成了两类来进行调度：</p>
|
||
<ul class="- topic/ul ul" id="usb_host_ehci_internal_structure__ul_g3x_lpz_21c" data-ofbid="usb_host_ehci_internal_structure__ul_g3x_lpz_21c">
|
||
<li class="- topic/li li" data-ofbid="d164387e45__20250123155217">
|
||
<p class="- topic/p p" data-ofbid="d164387e47__20250123155217"><code class="+ topic/ph pr-d/codeph ph codeph">Asynchronous Schedule</code>。用来传输对时间延迟要求不高的 Endpoint 数据，包括
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">Control Transfer</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">Bulk Transfer</code>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d164387e59__20250123155217">
|
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<p class="- topic/p p" data-ofbid="d164387e61__20250123155217"><code class="+ topic/ph pr-d/codeph ph codeph">Periodic Schedule</code>。用来传输对时间延迟要求高的 Endpoint 数据，包括
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">Isochronous Transfer</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">Interrupt
|
||
Transfer</code>。</p>
|
||
</li>
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||
</ul>
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<section class="- topic/section section" id="usb_host_ehci_internal_structure__section_h3x_lpz_21c" data-ofbid="usb_host_ehci_internal_structure__section_h3x_lpz_21c"><h2 class="- topic/title title sectiontitle">Asynchronous Queue Schedule</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d164387e79__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_i3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_async.png" alt="image9"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d164387e86__20250123155217"><code class="+ topic/ph pr-d/codeph ph codeph">Asynchronous Schedule</code> 内部实现非常的简单就只有一级链表，链表中只有 <code class="+ topic/ph pr-d/codeph ph codeph">Queue
|
||
Head</code> 类型的描述符。每个时间片内传输完 Period 数据以后，再尽可能的传输 Asynchronous 数据即可。</p>
|
||
<p class="- topic/p p" data-ofbid="d164387e94__20250123155217">核心的描述符如下：</p>
|
||
<ul class="- topic/ul ul" id="usb_host_ehci_internal_structure__ul_j3x_lpz_21c" data-ofbid="usb_host_ehci_internal_structure__ul_j3x_lpz_21c">
|
||
<li class="- topic/li li" data-ofbid="d164387e99__20250123155217"><p class="- topic/p p" data-ofbid="d164387e100__20250123155217">Queue Head</p><div class="- topic/p p" data-ofbid="d164387e102__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_k3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_qh.png" alt="image10"/></div><br/></div></li>
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<li class="- topic/li li" data-ofbid="d164387e109__20250123155217"><p class="- topic/p p" data-ofbid="d164387e110__20250123155217">Queue Element Transfer Descriptor (qTD)</p><div class="- topic/p p" data-ofbid="d164387e112__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_m3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_qtd.png" alt="image11"/></div><br/></div></li>
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</ul>
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</section>
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<section class="- topic/section section" id="usb_host_ehci_internal_structure__section_n3x_lpz_21c" data-ofbid="usb_host_ehci_internal_structure__section_n3x_lpz_21c"><h2 class="- topic/title title sectiontitle">Periodic Queue Schedule</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d164387e126__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_o3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_period.png" alt="image12"/></div><br/></div>
|
||
<p class="- topic/p p" data-ofbid="d164387e133__20250123155217"><code class="+ topic/ph pr-d/codeph ph codeph">Periodic Schedule</code> 内部实现如上图所示，核心是两级链表：</p>
|
||
<ul class="- topic/ul ul" id="usb_host_ehci_internal_structure__ul_p3x_lpz_21c" data-ofbid="usb_host_ehci_internal_structure__ul_p3x_lpz_21c">
|
||
<li class="- topic/li li" data-ofbid="d164387e140__20250123155217"><p class="- topic/p p" data-ofbid="d164387e141__20250123155217">第一级链表如上图 <code class="+ topic/ph pr-d/codeph ph codeph">绿色</code> 所示。是各种传输结构的实际描述符，主要包含以下几种类型的描述符：</p><div class="- topic/p p" data-ofbid="d164387e146__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_q3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_period_type.png" alt="image13"/></div><br/></div></li>
|
||
<li class="- topic/li li" data-ofbid="d164387e153__20250123155217"><p class="- topic/p p" data-ofbid="d164387e154__20250123155217">第二级链表如上图 <code class="+ topic/ph pr-d/codeph ph codeph">橙色</code> 所示。是一个指针数组，数组中保存的是指向第一级链表的指针。这里每个数组成员代表一个时间分片
|
||
Frame/Micro-Frame 的起始位置，每个时间片会根据指针传输第一级链表中的数据，直到第一级链表的结尾。指针的格式如下：</p><div class="- topic/p p" data-ofbid="d164387e159__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_s3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_period_framelist.png" alt="image14"/></div><br/></div><p class="- topic/p p" data-ofbid="d164387e165__20250123155217">这里的调度思想就是：第一级链表是一个传输数据全集，第二级链表决定了某个时间片里要传输的数据。</p><p class="- topic/p p" data-ofbid="d164387e167__20250123155217">这样合理的安排二级链表的指针，比如间隔
|
||
8 次指向同一位置这部分数据的 interval 就是 8，间隔 4 次指向同一位置这部分数据的 interval 就是 4。 第一级链表也是要根据
|
||
interval 排序的。</p><p class="- topic/p p" data-ofbid="d164387e169__20250123155217"><code class="+ topic/ph pr-d/codeph ph codeph">Periodic Schedule</code> 核心的描述符除了 QH、QTD 还有
|
||
ITD：</p></li>
|
||
<li class="- topic/li li" data-ofbid="d164387e174__20250123155217"><p class="- topic/p p" data-ofbid="d164387e175__20250123155217">Isochronous (High-Speed) Transfer Descriptor (iTD)</p><div class="- topic/p p" data-ofbid="d164387e177__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_ehci_internal_structure__image_u3x_lpz_21c" src="../../../images/usb/usb_ehci_schedule_itd.png" alt="image15"/></div><br/></div></li>
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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_host_ehci_internal_structure__section_h3x_lpz_21c" data-tocid="usb_host_ehci_internal_structure__section_h3x_lpz_21c">Asynchronous Queue Schedule</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_ehci_internal_structure__section_n3x_lpz_21c" data-tocid="usb_host_ehci_internal_structure__section_n3x_lpz_21c">Periodic Queue Schedule</a></div></li></ul></div>
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