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他人的PCI设计经验

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'">另一方面是驱动设计的效率不够高。所以如果能用</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'">的</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'">方式达到几十</SPAN><SPAN 
lang=en><FONT face="Times New Roman">MB/s</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的带宽的话，已经是相当不错了。</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'">芯片选定后，就要开始原理图的设计了，可以登陆</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'">的网站，上面提供</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'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">DEMO</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板的原理图的，我们的原理图就可以参照进行设计。其实</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'">这端的原理图做起来比较简单，无非是一些引脚上拉下拉的问题，画的时候只参照</SPAN><SPAN 
lang=en><FONT face="Times New Roman">DEMO</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板的图和</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'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">DATASHEET</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就可以搞定。其中要注意的地方主要有这几个：</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo1; tab-stops: list 18.0pt"><FONT 
face="Times New Roman"><SPAN lang=en>1．<SPAN 
style="FONT: 7pt 'Times New Roman'"><FONT 
size=3>&nbsp;</FONT></SPAN></SPAN><SPAN lang=en>TEST</SPAN></FONT><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引脚要下拉，这是正常操作模式。如果上拉则是进入芯片测试模式。</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo1; tab-stops: list 18.0pt"><FONT 
face="Times New Roman"><SPAN lang=en>2．<SPAN 
style="FONT: 7pt 'Times New Roman'"><FONT 
size=3>&nbsp;</FONT></SPAN></SPAN><SPAN lang=en>PCI</SPAN></FONT><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">金手指处的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">PRSNT1#</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">PRSNT2#</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引脚一定至少要有一个下拉，或者两个都下拉（具体可参照</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</SPAN><SPAN 
lang=en><FONT face="Times New Roman">V2.3</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），否则找不到卡。</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo1; tab-stops: list 18.0pt"><SPAN 
lang=en><FONT face="Times New Roman">3．<SPAN 
style="FONT: 7pt 'Times New Roman'"><FONT 
size=3>&nbsp;</FONT></SPAN></FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模式选择引脚</SPAN><SPAN 
lang=en><FONT face="Times New Roman">MODE0</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">MODE1</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如果都下拉，是</SPAN><SPAN 
lang=en><FONT face="Times New Roman">C</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模式，即</SPAN><SPAN 
lang=en><FONT face="Times New Roman">LOCAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的地址线和数据线是分开的；如果</SPAN><SPAN 
lang=en><FONT face="Times New Roman">MODE0</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上拉，</SPAN><SPAN 
lang=en><FONT face="Times New Roman">MODE1</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下拉，则是</SPAN><SPAN 
lang=en><FONT face="Times New Roman">J</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模式，即</SPAN><SPAN 
lang=en><FONT face="Times New Roman">LOCAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的地址线和数据线复用。我采用的是</SPAN><SPAN 
lang=en><FONT face="Times New Roman">C</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模式。</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo1; tab-stops: list 18.0pt"><SPAN 
lang=en><FONT face="Times New Roman">4．<SPAN 
style="FONT: 7pt 'Times New Roman'"><FONT 
size=3>&nbsp;</FONT></SPAN></FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这是很关键的一点，即</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEDI/EEDO</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引脚的配置。有这样三种情况：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt"><SPAN lang=en><FONT 
face="Times New Roman">A</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当不安装</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，该引脚一定要下拉，用</SPAN><SPAN 
lang=en><FONT face="Times New Roman">1k</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的下拉电阻即可。此时启动后</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'">会按默认的值进行配置。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt"><SPAN lang=en><FONT 
face="Times New Roman">B</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当安装空白的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，该引脚需要上拉。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt"><SPAN lang=en><FONT 
face="Times New Roman">C</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当安装烧录好的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，该引脚需要上拉。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt"><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这里解释一下：卡设计好后，如果没有配置好</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值，也可以测试卡的硬件，按</SPAN><SPAN 
lang=en><FONT face="Times New Roman">A</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或</SPAN><SPAN 
lang=en><FONT face="Times New Roman">B</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">步骤，把卡插在</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'">的</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'">插槽上，如果硬件设计没有问题，是可以找到卡的。所以设计的时候应将此引脚设计成上下拉，根据需要装上拉或下拉电阻。这可以避免只能等配置好</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值后才能测试卡的硬件设计正确与否。</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo1; tab-stops: list 18.0pt"><FONT 
face="Times New Roman"><SPAN lang=en>5．<SPAN 
style="FONT: 7pt 'Times New Roman'"><FONT 
size=3>&nbsp;</FONT></SPAN></SPAN><SPAN lang=en>EEPROM</SPAN></FONT><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的设计问题，</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'">是应该搭配</SPAN><SPAN 
lang=en><FONT face="Times New Roman">93C56</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的，即</SPAN><SPAN 
lang=en><FONT face="Times New Roman">2k</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">容量的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</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'">是搭配</SPAN><SPAN 
lang=en><FONT face="Times New Roman">93C46</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种</SPAN><SPAN 
lang=en><FONT face="Times New Roman">1k</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。至于具体的厂商，可以选用</SPAN><SPAN 
lang=en><FONT face="Times New Roman">ST</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">M93C56</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或者</SPAN><SPAN 
lang=en><FONT face="Times New Roman">HOLTEK</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">HT93LC56</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</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'">公司的网站上有</SPAN><SPAN 
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的选型指导，可以下载来看。据我的调查，市场上很容易买到</SPAN><SPAN 
lang=en><FONT face="Times New Roman">ST</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的这种片子，<A 
href="javascript:;" 
&#111;nclick="tagshow(event, '%C6%E4%CB%FB');return false;"><U><STRONG>其他</STRONG></U></A>品牌的不是太好买。另外，如果你是有烧录机，打算将</SPAN><SPAN 
lang=en><FONT face="Times New Roman">ROM</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">烧录过后再安装在板子上，那么采用<A 
href="javascript:;" 
&#111;nclick="tagshow(event, '%B2%E5%BC%FE');return false;"><U><STRONG>插件</STRONG></U></A>的芯片比较方便，如果采用贴片的，烧录机要有相应的烧录</SPAN><SPAN 
lang=en><FONT face="Times New Roman">SOP-8</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的转接头才行。如果你是打算在线烧录，可以采用贴片的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">SOP-8</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的封装的片子，直接把空白的片子焊接在板子上即可，关于在线烧录，以下会详细解释。</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'">其实特别注意的这几条，</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'">的</SPAN><SPAN 
lang=en><FONT face="Times New Roman">DATASHEET</FONT></SPAN><SPAN