Amdahl Corporation

Joseph A Petolino, Jr

Gary A Woffinden

The reporting of errors that are detected when data which contains an error is moved from a high speed buffer memory array to a main storage array is deferred so that the error checking and correcting logic associated with the main storage memory array will recognize the data as containing an error generated in the buffer array and report the error only when the data is moved out of the main store. In this manner, a process relevant to the erroneous data is assured to be in operation when the error is reported.

Apparatus for storing data with deferred uncorrectable error reporting

Present invention presents a novel mechanism for reducing the amount of storage space necessary to perform error checking and correcting in a storage unit of a data processing machine by utilizing the information present in the parity checking portion of the storage unit. The novel mechanism is based on generating an error checking and correcting code which includes a first portion identifiable by parity bits normally stored with data words in a data storage device and a second portion. The second portion contains fewer bits than required in the prior art for an equivalent level of error checking and correcting and only the second portion is stored. When data is moved out of the storage device, the first portion is identified from the parity bits.

Apparatus for reducing storage necessary for error correction and

An apparatus for enhancing the speed of access of an execution unit in a data processing machine to the high speed buffer memory array by storing data from the execution unit in the buffer before completing error checking operations.

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Mountain View, CA, United States of America

Joseph A Petolino, Jr