Amdahl Corporation

Inventec Corp.

Nicholas Y Pang

Joseph A Petolino

Kent Wayne Wendorf

Christopher D Finan

Jeffrey L Baker

Ronald N Hilton

Kham X Nguyen

Jeffrey T Isozaki

Deming Cha

An interface between a storage unit and a system control unit maintains a sequential processing when retrying linestores by providing a single piece of information that the linestore is a 'first' in a series. An initial request flag accompanies linestore requests to the system controller and is returned to the storage unit with linestore replies. A mode indicator coupled with the storage unit pipeline sets a retry mode latch in response to a linestore restart reply, and resets the retry mode latch in response to a linestore read reply by the system controller to an initial request. Logic in the pipeline suppresses requests for the system resource in the pipeline, other than initial requests, when the retry mode latch is set, such as by flagging data subject of the second flow as locked or otherwise invalid. The port includes a state machine which preserves the order of pending requests for the system resource.

Retry request system in a pipeline data processing system where each

A system for updating an ECC code over a line in a data store when only part of the line has been updated is described. The system receives the update and its address, decodes the address to generate a first signal identifying the part of the line to be updated and a second signal identifying an un-updated part of the section. The data of the update and the first signal are used to generate a first partial error code. Data from the un-updated part of the line is read as the update is written to the store. The data from the un-updated part of the section and the second signal are used to generate a second partial error code. Finally, the first and second partial error codes are combined to generate the updated error code.

Cache error code update

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San Mateo, CA, United States of America

Nicholas Y Pang