Computer system operation with corrected read data function

Details Computer system operation with corrected read data function Computer system operation with corrected read data function

1991-06-27

1993-11-16

Canney, Vincent P.

Excavating

371 102, G06F 1110

Patent

active

052630323

ABSTRACT:
A computer system having a memory with an ECC function employs an improved method for handling corrected read data events, so transient errors caused by alpha particle hits in DRAMs may be distinguished from hard errors. When a corrected read data event occurs, a footprint defining its location is compared with previously-stored footprints to determine if this location has failed before. Also, a location showing a corrected read data event is "scrubbed" (data is read, corrected and rewritten) so transient error locations are removed. If another corrected read data event occurs for this same location, after scrubbing, then the location is assumed to have a hard fault, and so the page containing this location is replaced.

REFERENCES:
patent: 4920539 (1990-04-01), Albonesi
patent: 4964130 (1990-10-01), Bowden, III et al.
Saleh, "Reliability of Scrubbing Recovery-Techniques for Memory Systems", IEEE Trans. on Reliability, Apr. 1990, pp. 114-122.
Bossen et al., "A System Solution to the Memory Softerror Problem", IBM J. Res. Develop., May 1980, pp. 390-397.
Kunda et al., "Improving Memory Subsystem Availability Using BIST", IEEE Int'l Conf. on Computer-Aided Design, Dig. of Tech. Papers, 1987, pp. 340-343.

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