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USB设备架构

2008-6-17 10:36

本帖最后由 eehome 于 2013-1-5 10:06 编辑

<p><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 18pt; FONT-FAMILY: 'times New="New"  Roman'; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">USB</span><span style="FONT-SIZE: 18pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-font-kerning: 1.0pt; mso-hansi-font-family: 'Times New="New"  Roman'; mso-bidi-font-family: 'Times New="New"  Roman'; mso-ascii-font-family: 'Times New="New"  Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">设备架构</span></b><br/></p>
<p>  </p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">USB</span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">设备可被划分三层:<span lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">·底层是传送和接收数据包的总线接口<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">·中间层处理总线接口与不同端点之间的数据路由端节点是数据的终结提供处或使用处,它可被看作数据源或数据接收端<span lang="EN-US">(Sink)<o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">·最上层的功能由串行总线设备提供,比如鼠标,或<span lang="EN-US">ISDN</span>接口。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">本章描述的是<span lang="EN-US">USB</span>设备中间层的通用属性与操作。这些属性与操作由设备的特定功能的部分用于通过总线接口最终与主机<span lang="EN-US">(host)</span>的通信。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">9.1<span style="mso-spacerun: yes">  </span>USB</span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">设备状态<span lang="EN-US"><o:p></o:p></span></span></b></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span>USB</span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">设备有若干可能的状态,其中一些对于<span lang="EN-US">USB</span>与主机<span lang="EN-US">(host)</span>来说是外置的,而另外一些对<span lang="EN-US">USB</span>设备来说是内置的,这一节描述的就是这些外置状态。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chsdate w:st="on" isrocdate="False" islunardate="False" day="30" M="M"  year="1899"><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">9.1.1</span></b></st1:chsdate><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">  </span></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">外置的设备状态<span lang="EN-US"><o:p></o:p></span></span></b></p>
<p class="MsoPlainText" style="LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt"><span style="mso-spacerun: yes">    </span></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">本小节描述的是外部可见的<span lang="EN-US">USB</span>设备状态<span lang="EN-US">(</span>见图<span lang="EN-US">8-1)</span>。表<span lang="EN-US">8-1</span>汇集这些外置设备状态之间的转化关系。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoPlainText" style="TEXT-INDENT: 24pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-bidi-font-size: 10.0pt">注意:<span lang="EN-US">USB</span>设备会响应上行端口<span lang="EN-US">(upstream Port)</span>传来一个复位<span lang="EN-US">(reset)</span>信号进行复位操作。当<span lang="EN-US">reset</span>信号完成的时候,<span lang="EN-US">USB</span>设备业已复位。<span lang="EN-US"><o:p></o:p></span></span></p>
E2IWtpP7.doc (286 KB)
(下载次数: 10, 2008-6-17 10:36 上传)
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回帖(3)

刘梦雨

2012-5-15 11:49:24

张工

2012-5-20 19:58:46
说实话,看着太累人了··

szglzxymd

2012-9-24 01:53:03
什么来的。。。

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