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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: 宋體"><FONT face=宋體
size=2>IEEE1149標準知識介紹</FONT></SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 28.1pt; TEXT-ALIGN: center"
align=center><FONT face=宋體 size=2><SPAN
style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋體; 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: 宋體; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">測試</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT
face=宋體 size=2>要想理解IEEE1149標準JTAG邊界掃描(boundary
scan)技術，先分析一下其他的基本測試方法。有比較才有鑒別嘛</FONT></SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 21pt"><FONT face=宋體 size=2><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在測試數字邏輯時，邏輯值（</SPAN><SPAN
lang=EN-US>1</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-US>0</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）需要預先輸入給</SPAN><SPAN
lang=EN-US>cluster</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，然后觀察其輸出的值。輸出值與期望值作比較，來判斷測試的</SPAN><SPAN
lang=EN-US>pass</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-US>fail.</SPAN></FONT></P>
<P class=MsoNormal style="TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT
face=宋體 size=2>這個</FONT></SPAN><FONT face=宋體 size=2><SPAN
lang=EN-US>cluster</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可能僅僅是簡單的聯線，一個</SPAN><SPAN
lang=EN-US>IC</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或多個</SPAN><SPAN
lang=EN-US>IC</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">組成。所以，不管用什么樣的方法測試，僅僅是用不同的方法對輸入輸出進行訪問。</SPAN></FONT></P>
<P class=MsoNormal style="TEXT-INDENT: 21pt"><FONT face=宋體 size=2><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在功能測試時，用來測試的</SPAN><SPAN
lang=EN-US>cluster</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是嵌入在別的邏輯模塊里的。假如測試裝置與</SPAN><SPAN
lang=EN-US>cluster</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通過一個接口相聯接，所有的測試都要通過這個接口進行。這樣的測試是需要對產品有比較深的理解。對測試開發及維修人員都有比較高的要求。</SPAN></FONT></P>
<P class=MsoNormal style="TEXT-INDENT: 21pt"><SPAN lang=EN-US><FONT
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