Polling of I/O device status comparison performed in the polled I/O device
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United States of America Patent
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Jun 7, 1994
Issued Date -
N/A
app pub date -
Oct 16, 1992
filing date -
Jun 28, 1991
priority date (Note) -
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Abstract
A method and apparatus for polling a status register selectively delays the returning of status data in the status register. Prior to polling, a match register is loaded via a system bus with a desired status. Status data is presented to the system bus when the status data is the same as the desired status. The features of the invention also permit the masking of selective bits of the status register during the comparison of the status data with the desired status. A mode register selectively inhibits the delayed presentation, and a timer ensures that status data is presented to the system bus within a predetermined interval even if the status data is not the same as the desired status.
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