Bus arbitration system and method

Details Bus arbitration system and method Bus arbitration system and method

1987-04-07

1989-06-06

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 100

Patent

active

048376825

ABSTRACT:
A bus arbitration system for use in a data processing system which operates on clocked cycles for determining priorities in accessing a system memory and one or more local memories associated with processor units is shown. Each of the processor units are operatively coupled through a local bus to its associated local memory. A system bus interconnects the processor units and local memories in parallel to the local bus and the system is connected to an input/output device and the system memory. The bus arbitration system monitors requests made by processor units or the input/output device for access to the system memory or a local memory during the clock cycle. A determination section of a bus arbitration module determines whether access is available over the system data bus or a local data bus. A priority logic section identifies the existence of a conflict due to one or more of the processor units and the input/output device requesting access over the system bus to either the system memory or the same associated local memory during the clock cycle and for granting a request to a selected one of the processor units or the input/output device for accessing either the system memory or one of the associated local memories over the system bus. When a processor unit is denied access to the system bus, and in the absence of a conflict in request for the same associated local memory, a request is granted to a processor unit to access its associated local memory over its local bus during the clock cycle.

REFERENCES:
patent: 4101960 (1978-07-01), Stokes et al.
patent: 4123794 (1978-10-01), Matsumoto
patent: 4181936 (1980-11-01), Kober
patent: 4214305 (1980-07-01), Tokita et al.
patent: 4302818 (1981-11-01), Neimann
patent: 4457849 (1985-10-01), Louie et al.
patent: 4646232 (1987-02-01), Chang et al.

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