Method and apparatus for interrupt processing in a computer system having peripheral units connected in a daisy chain
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United States of America Patent
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Jun 2, 1992
Grant Date -
N/A
app pub date -
Dec 12, 1988
filing date -
Dec 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An interrupt processing method and an interrupt processing apparatus provides an end indicative information storing unit for storing an end indicative information of a daisy chain for at least one of a plurality peripheral units, the peripheral unit receiving the indicative information when the peripheral unit receives an acknowledge signal but does not output a request signal, and the peripheral unit outputs a specific chain end state signal to the central processing unit, so that the central processing unit is returned from a response waiting state. Therefore, when an error request signal is produced by noise, etc., delay at a central processing unit is reduced. Further, the daisy chain connection is cut at an optional portion and a request signal from an irrevelant peripheral unit is ignored, so that the efficiency of the processing is improved.
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