Method and apparatus for updating an error-correcting code...

Details Method and apparatus for updating an error-correcting code... Method and apparatus for updating an error-correcting code...

2005-01-25

2005-01-25

Decady, Albert (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C710S074000, C365S103000, C711S137000

Reexamination Certificate

active

06848071

ABSTRACT:
One embodiment of the present invention provides a system that updates an error-correcting code for a line when only a portion of the line is updated during a store operation. The system operates by receiving the store operation, wherein the store operation includes new data to be stored to the portion of the line, as well as an address of the portion of the line. Next, the system reads old data for the portion of the line from the address, and then stores the new data to the portion of the line at the address. The system also updates the existing error-correcting code for the line to reflect the new data. This involves calculating a new error-correcting code for the line from the existing error-correcting code, the old data and the new data. The system then replaces the existing error-correcting code with the new error-correcting code.

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Publication, entitled “Computer Organization and Architecture Principles of Structure and Function,” by William Stallings, Ph.D., Macmillan Publishing Company, Collier Macmillan Publishers, pp. 99-106.

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