Scanning a protocol signal into an IC for performing a circuit operation
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United States of America Patent
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Jan 24, 2006
Issued Date -
N/A
app pub date -
Oct 21, 2003
filing date -
Jun 30, 1989
priority date (Note) -
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Abstract
A digital bus monitor used to observe data on a bus (14, 16, 18) connecting multiple integrated circuits (10, 12) comprises a memory buffer (30), bypass register (34), test port (38) and output control circuits (42, 46) controlled by an event qualifying module (EQM) (32). In response to a matching condition the EQM (32) may perform a variety of tests on incoming data while the integrated circuits (10, 12) continue to operate at speed. A plurality of digital bus monitors (20, 22) may be cascaded for observation and test of variable width data buses and variable width signature analysis.
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