Inter and intra priority resolution network for an asynchronous

Details Inter and intra priority resolution network for an asynchronous Inter and intra priority resolution network for an asynchronous

1987-12-07

1990-02-13

Chan, Eddie P.

Boots, shoes, and leggings

3642401, 3642402, 3642404, 3642429, G06F 1336

Patent

active

049012266

ABSTRACT:
A data processing system includes a plurality of units including a bus interface unit (BIU), each of which couple in common to different positions along an asynchronous common system bus. The BIU couples to a plurality of local units which connect to a high speed local bus. The asynchronous common system bus includes a distributed tie-breaking network which consists of a plurality of like priority network sections. The BIU includes a priority resolver which incorporates the priority network section having the highest priority access to the asynchronous bus. The priority resolver includes a local priority resolver circuit for resolving priorities between local requestors within a minimum amount of time. The priority network section and local priority resolver circuit are interconnected so that the signal generated by the network section request circuits to request use of the asynchronous bus is applied to the local priority resolver circuit and to the common bus at the same time. This permits both bus resolution cycles for resolving external and internal requests to proceed in parallel. Thus, access to the system bus will always be resolved within a single bus resolution cycle of operation.

REFERENCES:
patent: 4006466 (1977-02-01), Patterson et al.
patent: 4296464 (1981-10-01), Woods et al.
patent: 4373183 (1983-02-01), Means et al.
patent: 4387425 (1983-06-01), El-Gohary
patent: 4604685 (1986-08-01), Brown et al.

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