Apparatus and method for responding to an aborted signal exchange between subsystems in a data processing system
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Jan 29, 1986
filing date -
Jan 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a data processing system in which access to a second unit by a first unit through a system bus is determined by an arbitration unit, when a requesting unit that receives access to the system bus is unable to use that access for interaction with the second unit, a busy signal is provided to the arbitration unit and to the units. The busy signal causes the units to reinstitute a request for access to the system bus when the subsystem had an aborted transaction. The busy signal enforces a delay in the next arbitration for the system bus until a unit, with an aborted transaction as a result of the busy signal, can reassert the request for access signal. Moreover, apparatus can be included with the arbitration unit that permits rearbitrating access to the bus using the priority conditions in effect at the time of the original arbitration.
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