Apparatus for controlling concurrent operations of a system control unit including activity register circuitry
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United States of America Patent
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-
Jul 30, 1991
Issued Date -
N/A
app pub date -
Sep 19, 1989
filing date -
Feb 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a data processing system having a system controller unit (SCU) which interfaces a plurality of equipments with a memory unit, the SCU determines which of the equipments will be permitted to communicate with the SCU or memory unit in response to a request from the equipments. The SCU includes an activity monitor and control apparatus which determines whether the request from the equipments can be accepted. The activity monitor and control apparatus comprises a plurality of first elements, each of the first elements being assigned to monitor a request which has been accepted. The activity monitor and control apparatus monitors the operations with the SCU thereby providing status information of the SCU. A plurality of second elements, which is operatively connected to the first elements, combines preselected status information to generate control signals thereby indicating current and future availability of the SCU in order to determine whether a request can be accepted.
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