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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="ArtInChip 提供了兼容标准 EHCI 的 USB Host Controller。 EHCI 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 OHCI 。在 EHCI 协议内称这种伴生的 OHCI 控制器为 companion host controllers 。 由 EHCI 驱动根据端口速率情况来决定由谁来处理： ..."/><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="2024-01-24"/><meta name="DC.date.modified" content="2024-02-04"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="usb_host_aic_usb_host_controller"/><meta name="DC.language" content="zh-CN"/><title>AIC USB Host Controller</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-host-aic_usb_host_controller.dita"/><meta name="wh-out-relpath" content="topics/sdk/usb/usb-host-aic_usb_host_controller.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-host-aic_usb_host_controller.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">AIC USB Host Controller</h1><div class="date inPage">4 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"><p class="- topic/p p" data-ofbid="d74941e23__20250121171523">ArtInChip 提供了兼容标准 EHCI 的 USB Host Controller。</p><p class="- topic/p p" data-ofbid="d74941e25__20250121171523"><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
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<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
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<code class="+ topic/ph pr-d/codeph ph codeph">companion host controllers</code>。</p><div class="- topic/p p" data-ofbid="d74941e41__20250121171523"><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><p class="- topic/p p" data-ofbid="d74941e45__20250121171523">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><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"><li class="- topic/li li" data-ofbid="d74941e51__20250121171523">
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<p class="- topic/p p" data-ofbid="d74941e53__20250121171523">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
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<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><li class="- topic/li li" data-ofbid="d74941e68__20250121171523">
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<p class="- topic/p p" data-ofbid="d74941e70__20250121171523">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
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<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
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<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
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<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="d74941e95__20250121171523">
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<p class="- topic/p p" data-ofbid="d74941e97__20250121171523">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
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<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
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<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></ul><p class="- topic/p p" data-ofbid="d74941e119__20250121171523">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><div class="- topic/p p" data-ofbid="d74941e121__20250121171523"><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></div></article></main></div>
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