Priority selector

Details Priority selector Priority selector

1991-09-17

1994-02-01

Shaw, Dale M.

G06F 1337

Patent

active

052839036

ABSTRACT:
A priority selector of a system including a plurality of processors and a shared source commonly used by the processors sets a priority of requests supplied from the processors for using the shared source and supplies a use permission to a single processor. The priority selector has a plurality of lock request priority setting circuits corresponding to the processors and a request selector. When a contention occurs between an own request from a processor and other request from another processor, the corresponding lock request priority setting circuit upgrades the non-permitted own request as a high priority request when the other request is permitted, and downgrades a following own request as a low priority request when the own request is accepted. The request selector receives requests from the processors, the priority of which is set by the lock request priority setting circuits, selects a high priority request prior to a low priority request, and selects a request in accordance with a predetermined priority when the received requests are of the same priority.

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patent: 4829467 (1989-03-01), Ogata

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