Store group bus allocation system

Details Store group bus allocation system Store group bus allocation system

1982-12-27

1985-04-30

Shaw, Gareth D.

Communications: electrical

Continuously variable indicating

With meter reading

G06F 946, G06F 900

Patent

active

045147280

ABSTRACT:
Store group circuits (102a,b,c or 202a,b,c) in fixed priority bus allocation arrangements eliminate lockouts and reduce delays for devices (101a,b,c) requesting access to a shared resource such as a data bus. The store group circuit stores (111 or 205-1 through 205-3) all access requests (REQA, REQB, REQC) from the devices present at a time instant, inhibits (110 or 210) storage of subsequent requests until each device associated with a stored request is granted access (GRANTA, GRANTB, GRANTC), and removes from storage each request associated with a device which has been granted access. Arbitration is performed among the stored requests using existing arbiters (103) in the fixed priority bus allocation arrangement. Bus access is guaranteed for devices whose requests are stored in the store group circuit thereby eliminating lockouts.

REFERENCES:
patent: 3818447 (1974-06-01), Craft
patent: 4130865 (1978-12-01), Heart et al.
patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4237534 (1980-12-01), Felix
patent: 4262357 (1981-04-01), Shima
patent: 4270167 (1981-05-01), Koehler et al.
patent: 4314335 (1982-02-01), Pezzi
patent: 4375639 (1983-03-01), Johnson, Jr.

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