P1149.7 - Board Test Workshop Home Page
P1149.7 - Board Test Workshop Home Page
P1149.7 - Board Test Workshop Home Page
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Overloading the Bypass Instruction<br />
(using Zero-bit DR-Scans (ZBS))<br />
• IR register set to BYPASS or IDCODE<br />
instruction by:<br />
• IR-Scan or<br />
• <strong>Test</strong>-Logic-Reset<br />
Method:<br />
• ZBS = CaptureExitUpdate<br />
• The number of consecutive ZBSs are counted<br />
to create a control level that specifies the<br />
overloaded function<br />
• This is performed by standard IEEE 1149.1<br />
TAP controller state sequences<br />
IR Register<br />
BYPASS<br />
GS - BTW - 09/014/2006
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