Method and apparatus for reservation of data buses between multi

Details Method and apparatus for reservation of data buses between multi Method and apparatus for reservation of data buses between multi

1995-06-02

1998-11-10

Harrity, John E.

39520039, 39520069, 39520081, 39580031, 39518509, 395290, 395308, 395311, G06F 1337

Patent

active

058357149

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 requester must wait for the data bus to become available and a token passed to the requester. 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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