Bidirectional data bus reservation priority controls having toke

Details Bidirectional data bus reservation priority controls having toke Bidirectional data bus reservation priority controls having toke

1991-09-05

1999-09-14

An, Meng-Ai T.

395306, G06F 1314

Patent

active

059535105

ABSTRACT:
A data bus reservation system controls data transfer between storage control elements (SCEs) in a multi-processor system. Each SCE is assigned a default bidirectional (BIDI) data bus for transfer of data. If a request for data transfer is made and the default data bus is already reserved, then the requestor must wait for the data bus to become available and a token passed to the requestor. When the token is passed to the requester, it has priority to reserve an available data bus. The token is passed to a different processor with each machine cycle. Additionally, there is error checking logic which checks a confirmation sent to the other SCE when the BIDI bus has been reserved.

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