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<DIV class=cnt><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=en><FONT
face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数据传输卡的详细设计经历（基于</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）之一<BR></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">去年的时候，接受公司分配的任务，做了一块</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数据传输卡，作用是把前面板子传过来的数据上传到</SPAN><SPAN
lang=en><FONT face="Times New Roman">PC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">机，</SPAN><SPAN
lang=en><FONT face="Times New Roman">PC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上的应用软件会进行一些后续的处理。开始</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的时候也有些茫然，因为我以前也没做过</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卡，只是对</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总线的信号大概有所了解。于是开始上网查资料，把别人写的文章搜了很多下载下来，细细地看。看多了，也有点感觉了，就开始下手做。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=en><FONT
face="Times New Roman">
<P></P></FONT></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">做</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卡无非是这三步：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一</SPAN><FONT
face="Times New Roman"></FONT><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">硬件原理图及</SPAN><SPAN
lang=en><FONT face="Times New Roman"><A href="javascript:;"
onclick="tagshow(event, 'PCB');return false;"><U><STRONG><A
onclick="javascript:tagshow(event, 'PCB');" href="javascript:;"
target=_self><U><STRONG>PCB</STRONG></U></A></STRONG></U></A></FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">布板</SPAN><SPAN
lang=en><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">二</SPAN><SPAN
lang=en><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">写驱动程序</SPAN><SPAN
lang=en><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三</SPAN><SPAN
lang=en><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">写上层测试程序</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=en><FONT
face="Times New Roman">
<P></P></FONT></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一步应该算是比较简单。首先是</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">协议处理芯片的选型。现在最常用的有两款：即</SPAN><SPAN
lang=en><FONT face="Times New Roman">PLX</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公司的</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI9052</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。其区别就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">9052</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不支持</SPAN><SPAN
lang=en><FONT face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输，而</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">支持</SPAN><SPAN
lang=en><FONT face="Times New Roman">DMA</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输。如果你的应用对带宽要求较高的话，建议采用</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，这样比较有把握。如果带宽要求较低而又想缩减成本的话，</SPAN><SPAN
lang=en><FONT face="Times New Roman">9052</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是个不错的选择。这两种芯片的可参考的设计资料也比较多。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=en><FONT
face="Times New Roman">
<P></P></FONT></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们的产品对带宽要求其实并不算高，仅为</SPAN><SPAN
lang=en><FONT face="Times New Roman">10MB/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">左右，但考虑到</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输的效率，谨慎起见，我还是选了</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，这样带宽会有比较多的富裕，就算设计当中驱动的效率打点折扣，也还是够用的。这里明确一下带宽的问题，如果</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总线的速率是</SPAN><SPAN
lang=en><FONT face="Times New Roman">33MHz</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的话，那么它的理论传输带宽就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">33Mx32b=1.056Gb/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如果换算成字节的话，那就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">1.056Gb/8=132MB/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。请注意这是理论带宽，实际设计不会达到的，因为一方面是硬件设计的问题，</SPAN><FONT
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