金鹏飞科技-理解边界扫描(boundary scan)jtag测试.htm

金鹏飞科技-理解边界扫描(boundary scan)JTAG测试.htm

      face=宋体 size=2>ICT</FONT></SPAN><FONT face=宋体 size=2><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">测试对针床有很高的要求，每种板子都要有相应的测试夹具。测试夹具的费用如果计算在内会增加测试的成本。</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><FONT face=宋体 size=2><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当然边界扫描(boundary 
      scan)对测试人员的要求也不低啊。如果</SPAN><SPAN lang=EN-US>cluster</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是嵌入到 
      边界扫描(boundary scan)链路中的，测试可以通过这些链路进行。测试数据从</SPAN><SPAN 
      lang=EN-US>TDI</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">进入，然后串并转换，依次通过边界扫描(boundary 
      scan)节点，最后再经过并</SPAN><SPAN lang=EN-US>-</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传变换，从</SPAN><SPAN 
      lang=EN-US>TDO</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">进入测试装置。由</SPAN><SPAN 
      lang=EN-US>jtag</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设备来判断测试的结果。</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><FONT face=宋体 size=2><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对于边界扫描(boundary 
      scan)测试，一些公司已经将其进一步简化。举例来说，比如通过</SPAN><SPAN lang=EN-US>ISDN</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">进行传输数据，用户时不必介意底层的协议的。同理，很多 
      边界扫描(boundary scan)的软件也做到了这些。</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><FONT face=宋体 size=2><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">玩转</SPAN><SPAN 
      lang=EN-US>JTAG</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，就是处理好五条线：</SPAN><SPAN 
      lang=EN-US>TDI,TDO,TRST(test reset),TCLK(test clock),TMS(test mode 
      select)</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=宋体 size=2><IMG 
      height=355 src="金鹏飞科技-理解边界扫描(boundary scan)JTAG测试.files/wpe1.jpg" 
      width=553 v:shapes="_x0000_i1025"><O:P> </O:P></FONT></SPAN></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt; TEXT-ALIGN: center" 
      align=center><FONT face=宋体 size=2><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana">bsdl IC</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">的内部结构</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana"><O:P> 
      </O:P></SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=宋体 size=2><IMG 
      height=412 src="金鹏飞科技-理解边界扫描(boundary scan)JTAG测试.files/wpe2.gif" 
      width=553 v:shapes="_x0000_i1026"><O:P> </O:P></FONT></SPAN></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><FONT face=宋体 size=2><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">一个例子来说明</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">bsdl</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">在一块</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">pcb</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">上一条链路，通常情况下，仅有一部分</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">ic</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">是带有</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">bsdl</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">管脚的。</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana"><O:P> 
      </O:P></SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=宋体 size=2><IMG 
      height=329 src="金鹏飞科技-理解边界扫描(boundary scan)JTAG测试.files/wpe3.gif" 
      width=553 v:shapes="_x0000_i1027"><O:P> </O:P></FONT></SPAN></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=宋体 
      size=2>ict</FONT></SPAN><FONT face=宋体 size=2><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">和</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">bsdl</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">的比较，显然在</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">pad</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">越来越小的高密度</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">pcb</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">板上，用</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">bsdl</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">来测试占有很大的优势，无论是测试的成本还是准确度来说。这张图也给出了</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">bsdl</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">能检测出的几种常见的故障，</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">briedge</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">，</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">open</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">，</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">stuck</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">。在一定程度上可以起到</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">5dx</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">的作用哦。</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana"><O:P> 
      </O:P></SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana"><FONT face=宋体 size=2><IMG 
      height=383 src="金鹏飞科技-理解边界扫描(boundary scan)JTAG测试.files/wpe4.gif" 
      width=554 v:shapes="_x0000_i1028"><O:P> </O:P></FONT></SPAN></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><FONT face=宋体 size=2><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">边界扫描(boundary 
      scan)所能做到的</SPAN><SPAN lang=EN-US 
      style="COLOR: black; FONT-FAMILY: Verdana">,</SPAN><SPAN 
      style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">包括</SPAN><SPAN 
      lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana">infra, inter,flash 
      &amp; EPLD</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 18pt"><FONT face=宋体 
      size=2>　网络文章摘录，如有不妥请联系管理员</FONT></P></TD></TR></TBODY></TABLE></CENTER></DIV>
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    <TD align=middle width=719>建议分辨率:800x600</TD></TR></TBODY></TABLE>
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