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📄 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
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      <P class=MsoNormal style="TEXT-INDENT: 28.1pt; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="COLOR: #000000; FONT-STYLE: italic; FONT-FAMILY: 宋体"><FONT face=宋体 
      size=2>IEEE1149标准知识介绍</FONT></SPAN></P>
      <P class=MsoNormal style="TEXT-INDENT: 28.1pt; TEXT-ALIGN: center" 
      align=center><FONT face=宋体 size=2><SPAN 
      style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">理解</SPAN><SPAN 
      lang=EN-US 
      style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: Verdana; mso-bidi-font-size: 9.0pt">jtag</SPAN><SPAN 
      style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">测试</SPAN><SPAN 
      lang=EN-US 
      style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: Verdana; mso-bidi-font-size: 9.0pt"><O:P> 
      </O:P></SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT 
      face=宋体 size=2>要想理解IEEE1149标准JTAG边界扫描(boundary 
      scan)技术，先分析一下其他的基本测试方法。有比较才有鉴别嘛</FONT></SPAN></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'">在测试数字逻辑时，逻辑值（</SPAN><SPAN 
      lang=EN-US>1</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-US>0</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）需要预先输入给</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'">，然后观察其输出的值。输出值与期望值作比较，来判断测试的</SPAN><SPAN 
      lang=EN-US>pass</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-US>fail.</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT 
      face=宋体 size=2>这个</FONT></SPAN><FONT face=宋体 size=2><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'">可能仅仅是简单的联线，一个</SPAN><SPAN 
      lang=EN-US>IC</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或多个</SPAN><SPAN 
      lang=EN-US>IC</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组成。所以，不管用什么样的方法测试，仅仅是用不同的方法对输入输出进行访问。</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'">在功能测试时，用来测试的</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'">是嵌入在别的逻辑模块里的。假如测试装置与</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'">通过一个接口相联接，所有的测试都要通过这个接口进行。这样的测试是需要对产品有比较深的理解。对测试开发及维修人员都有比较高的要求。</SPAN></FONT></P>
      <P class=MsoNormal style="TEXT-INDENT: 21pt"><SPAN lang=EN-US><FONT
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