Data processing with bidirectional data bus reservation priority controls.

摘要

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 requestor, 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 in which checks a confirmation sent to the other SCE when the BIDI bus has been reserved. <IMAGE>