Monitor circuit for detecting noise conditions through input output coincidence comparison
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United States of America Patent
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Nov 16, 1993
Issued Date -
N/A
app pub date -
Jun 1, 1990
filing date -
Feb 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A monitor circuit is provided, which includes a data storage unit having dummy data stored therein, a buffer circuit connected to the output of the data storage unit, a coincidence circuit for comparing the data on the I/O bus connected between the buffer circuit and I/O units with the dummy data of the data storage unit, and a flag circuit for setting an abnormal flag responsive to the non-coincidence output from the coincidence circuit. During the I/O refresh of a PC, such an abnormal flag is set in response to a disturbance of the I/O bus. The I/O refresh is repeatedly performed in the event the flag is set.
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