Apparatus for controlling concurrent operations of a system cont

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3642814, G06F 1314

Patent

active

050364561

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.

REFERENCES:
patent: 4080649 (1978-03-01), Calle
patent: 4413317 (1983-11-01), Swenson
patent: 4425615 (1984-01-01), Swenson et al.
patent: 4564899 (1986-01-01), Holly et al.

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