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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="active"><div data-tocid="usb_host_aic_usb_host_controller-d4445e7720" class="topicref" data-id="usb_host_aic_usb_host_controller" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-aic_usb_host_controller.html" id="usb_host_aic_usb_host_controller-d4445e7720-link">AIC USB Host Controller</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_ehci_internal_structure-d4445e7734" class="topicref" data-id="usb_host_ehci_internal_structure" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-ehci_internal_structure.html" id="usb_host_ehci_internal_structure-d4445e7734-link">EHCI 内部结构</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_ehci_driver-d4445e7748" class="topicref" data-id="usb_host_ehci_driver" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a 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-aic_usb_host_controller.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">AIC USB Host Controller</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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<p class="- topic/p p" data-ofbid="d76799e33__20250123155205">ArtInChip 提供了兼容标准 EHCI 的 USB Host Controller。</p>
|
||
<p class="- topic/p p" data-ofbid="d76799e36__20250123155205"><code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 只支持 USB 2.0 高速传输，为了向下兼容 USB 1.1，它直接在内部集成最多 4 个全速或者慢速控制器
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code>。在 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 协议内称这种伴生的 <code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 控制器为
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">companion host controllers</code>。</p>
|
||
<div class="- topic/p p" data-ofbid="d76799e53__20250123155205"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_aic_usb_host_controller__image_dmm_kpz_21c" src="../../../images/usb/usb_ehci_ohci.png" alt="image6"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d76799e60__20250123155205">由 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 驱动根据端口速率情况来决定由谁来处理：</p>
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<ul class="- topic/ul ul" id="usb_host_aic_usb_host_controller__ul_emm_kpz_21c" data-ofbid="usb_host_aic_usb_host_controller__ul_emm_kpz_21c">
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<li class="- topic/li li" data-ofbid="d76799e68__20250123155205">
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<p class="- topic/p p" data-ofbid="d76799e70__20250123155205">每个端口有一个 <code class="+ topic/ph pr-d/codeph ph codeph">Owner</code> 属性，用来决定是 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 管理还是
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 管理。就是一个 <code class="+ topic/ph pr-d/codeph ph codeph">Switch</code> 开关，决定 USB
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||
数据切到哪边处理。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d76799e86__20250123155205">
|
||
<p class="- topic/p p" data-ofbid="d76799e88__20250123155205">初始状态时端口默认属于 <code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 管理。所以对于硬件上从 <code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 升级到
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> ，而软件上只有 <code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 驱动而没有
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 驱动的系统来说是透明的，它继续把 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 当成
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 硬件来使用就行了，保持完美的向前兼容。</p>
|
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</li>
|
||
<li class="- topic/li li" data-ofbid="d76799e114__20250123155205">
|
||
<p class="- topic/p p" data-ofbid="d76799e116__20250123155205">如果系统软件上启用了 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 驱动，它首先会把所有端口的 <code class="+ topic/ph pr-d/codeph ph codeph">Owner</code> 配置成
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 管理。如果 <code class="+ topic/ph pr-d/codeph ph codeph">EHCI</code> 驱动发现端口连接且速率是全速或者慢速，则把端口的
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">Owner</code> 配置成 <code class="+ topic/ph pr-d/codeph ph codeph">OHCI</code> 管理。</p>
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</li>
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</ul>
|
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<p class="- topic/p p" data-ofbid="d76799e141__20250123155205">对于 EHCI 这种包含两种控制器的兼容方式，软件上需要同时启动 EHCI Driver 和 OHCI Driver，才能完整的兼容 USB 1.0 和 USB 2.0：</p>
|
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<div class="- topic/p p" data-ofbid="d76799e144__20250123155205"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_aic_usb_host_controller__image_fmm_kpz_21c" src="../../../images/usb/usb_ehci_ohci_sw.png" alt="image7"/></div><br/></div>
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