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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'">另一方面是驅(qū)動(dòng)設(shè)計(jì)的效率不夠高。所以如果能用</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'">的</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'">方式達(dá)到幾十</SPAN><SPAN
lang=en><FONT face="Times New Roman">MB/s</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的帶寬的話，已經(jīng)是相當(dāng)不錯(cuò)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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">芯片選定后，就要開始原理圖的設(shè)計(jì)了，可以登陸</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'">的網(wǎng)站，上面提供</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'">的</SPAN><SPAN
lang=en><FONT face="Times New Roman">DEMO</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板的原理圖的，我們的原理圖就可以參照進(jìn)行設(shè)計(jì)。其實(shí)</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'">這端的原理圖做起來(lái)比較簡(jiǎn)單，無(wú)非是一些引腳上拉下拉的問題，畫的時(shí)候只參照</SPAN><SPAN
lang=en><FONT face="Times New Roman">DEMO</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">板的圖和</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'">的</SPAN><SPAN
lang=en><FONT face="Times New Roman">DATASHEET</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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這幾個(gè)：</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> </FONT></SPAN></SPAN><SPAN lang=en>TEST</SPAN></FONT><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引腳要下拉，這是正常操作模式。如果上拉則是進(jìn)入芯片測(cè)試模式。</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> </FONT></SPAN></SPAN><SPAN lang=en>PCI</SPAN></FONT><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">金手指處的</SPAN><SPAN
lang=en><FONT face="Times New Roman">PRSNT1#</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">PRSNT2#</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引腳一定至少要有一個(gè)下拉，或者兩個(gè)都下拉（具體可參照</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(xié)議</SPAN><SPAN
lang=en><FONT face="Times New Roman">V2.3</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），否則找不到卡。</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> </FONT></SPAN></FONT></SPAN><SPAN
lang=en><FONT face="Times New Roman">MODE0</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">MODE1</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的地址線和數(shù)據(jù)線是分開的；如果</SPAN><SPAN
lang=en><FONT face="Times New Roman">MODE0</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下拉，則是</SPAN><SPAN
lang=en><FONT face="Times New Roman">J</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的地址線和數(shù)據(jù)線復(fù)用。我采用的是</SPAN><SPAN
lang=en><FONT face="Times New Roman">C</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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> </FONT></SPAN></FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">這是很關(guān)鍵的一點(diǎn)，即</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引腳的配置。有這樣三種情況：</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">當(dāng)不安裝</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">時(shí)，該引腳一定要下拉，用</SPAN><SPAN
lang=en><FONT face="Times New Roman">1k</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的下拉電阻即可。此時(shí)啟動(dòng)后</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'">會(huì)按默認(rèn)的值進(jìn)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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">當(dāng)安裝空白的</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">時(shí)，該引腳需要上拉。</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">當(dāng)安裝燒錄好的</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">時(shí)，該引腳需要上拉。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt"><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">這里解釋一下：卡設(shè)計(jì)好后，如果沒有配置好</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值，也可以測(cè)試卡的硬件，按</SPAN><SPAN
lang=en><FONT face="Times New Roman">A</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">步驟，把卡插在</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'">的</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'">插槽上，如果硬件設(shè)計(jì)沒有問題，是可以找到卡的。所以設(shè)計(jì)的時(shí)候應(yīng)將此引腳設(shè)計(jì)成上下拉，根據(jù)需要裝上拉或下拉電阻。這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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值后才能測(cè)試卡的硬件設(shè)計(jì)正確與否。</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> </FONT></SPAN></SPAN><SPAN lang=en>EEPROM</SPAN></FONT><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的設(shè)計(jì)問題，</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'">是應(yīng)該搭配</SPAN><SPAN
lang=en><FONT face="Times New Roman">93C56</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; 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: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">這種</SPAN><SPAN
lang=en><FONT face="Times New Roman">1k</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。至于具體的廠商，可以選用</SPAN><SPAN
lang=en><FONT face="Times New Roman">ST</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; 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: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公司的網(wǎng)站上有</SPAN><SPAN
lang=en><FONT face="Times New Roman">EEPROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的選型指導(dǎo)，可以下載來(lái)看。據(jù)我的調(diào)查，市場(chǎng)上很容易買到</SPAN><SPAN
lang=en><FONT face="Times New Roman">ST</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的這種片子，<A
href="javascript:;"
onclick="tagshow(event, '%C6%E4%CB%FB');return false;"><U><STRONG>其他</STRONG></U></A>品牌的不是太好買。另外，如果你是有燒錄機(jī)，打算將</SPAN><SPAN
lang=en><FONT face="Times New Roman">ROM</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">燒錄過(guò)后再安裝在板子上，那么采用<A
href="javascript:;"
onclick="tagshow(event, '%B2%E5%BC%FE');return false;"><U><STRONG>插件</STRONG></U></A>的芯片比較方便，如果采用貼片的，燒錄機(jī)要有相應(yīng)的燒錄</SPAN><SPAN
lang=en><FONT face="Times New Roman">SOP-8</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的轉(zhuǎn)接頭才行。如果你是打算在線燒錄，可以采用貼片的</SPAN><SPAN
lang=en><FONT face="Times New Roman">SOP-8</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的封裝的片子，直接把空白的片子焊接在板子上即可，關(guān)于在線燒錄，以下會(huì)詳細(xì)解釋。</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'">其實(shí)特別注意的這幾條，</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'">的</SPAN><SPAN
lang=en><FONT face="Times New Roman">DATASHEET</FONT></SPAN><SPAN
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