Circuit for controlling access to a common memory based on prior

Details Circuit for controlling access to a common memory based on prior Circuit for controlling access to a common memory based on prior

1994-12-23

1998-09-15

Swann, Tod R.

395478, 395485, 395732, 395512, G06F 1318

Patent

active

058092781

ABSTRACT:
An access control apparatus comprises a memory accessed by a plurality of devices, a circuit for giving priority levels to the requests of these devices in access to the memory, a circuit for selecting one from these access requests according to the priority levels, and a control circuit for allowing a device not selected to access the memory in preference to the other ones, after a specified time has elapsed since the access was started. Use of the control circuit assures efficient access for a low-priority access request.

REFERENCES:
patent: 4829467 (1989-05-01), Ogata
patent: 5016167 (1991-05-01), Nguyen et al.
patent: 5115507 (1992-05-01), Callemyn
patent: 5301333 (1994-04-01), Lee
patent: 5392434 (1995-02-01), Bryant et al.
patent: 5509136 (1996-04-01), Korekata et al.

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