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<DIV class=cnt><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">數據傳輸卡的詳細設計經歷（基于</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）之一<BR></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">去年的時候，接受公司分配的任務，做了一塊</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">數據傳輸卡，作用是把前面板子傳過來的數據上傳到</SPAN><SPAN
lang=en><FONT face="Times New Roman">PC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">機，</SPAN><SPAN
lang=en><FONT face="Times New Roman">PC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上的應用軟件會進行一些后續的處理。開始</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的時候也有些茫然，因為我以前也沒做過</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卡，只是對</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">總線的信號大概有所了解。于是開始上網查資料，把別人寫的文章搜了很多下載下來，細細地看。看多了，也有點感覺了，就開始下手做。</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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卡無非是這三步：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">硬件原理圖及</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: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">寫驅動程序</SPAN><SPAN
lang=en><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">寫上層測試程序</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一步應該算是比較簡單。首先是</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">協議處理芯片的選型。現在最常用的有兩款：即</SPAN><SPAN
lang=en><FONT face="Times New Roman">PLX</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。其區別就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">9052</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">傳輸，而</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">傳輸。如果你的應用對帶寬要求較高的話，建議采用</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，這樣比較有把握。如果帶寬要求較低而又想縮減成本的話，</SPAN><SPAN
lang=en><FONT face="Times New Roman">9052</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是個不錯的選擇。這兩種芯片的可參考的設計資料也比較多。</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我們的產品對帶寬要求其實并不算高，僅為</SPAN><SPAN
lang=en><FONT face="Times New Roman">10MB/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">左右，但考慮到</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">傳輸的效率，謹慎起見，我還是選了</SPAN><SPAN
lang=en><FONT face="Times New Roman">9054</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，這樣帶寬會有比較多的富裕，就算設計當中驅動的效率打點折扣，也還是夠用的。這里明確一下帶寬的問題，如果</SPAN><SPAN
lang=en><FONT face="Times New Roman">PCI</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">總線的速率是</SPAN><SPAN
lang=en><FONT face="Times New Roman">33MHz</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的話，那么它的理論傳輸帶寬就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">33Mx32b=1.056Gb/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如果換算成字節的話，那就是</SPAN><SPAN
lang=en><FONT face="Times New Roman">1.056Gb/8=132MB/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。請注意這是理論帶寬，實際設計不會達到的，因為一方面是硬件設計的問題，</SPAN><FONT
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