Microcomputer having an error-correcting function based on a det

Details Microcomputer having an error-correcting function based on a det Microcomputer having an error-correcting function based on a det

1991-11-07

1995-04-04

Beausoliel, Jr., Robert W.

Excavating

371 511, 371 501, 371 374, 371 404, 371 215, G06F 1110, G06F 1134, G06F 1100, H03M 1300

Patent

active

054044952

ABSTRACT:
A microcomputer having an error correction function includes a summing function for calculating a total-sum of data associated with a block of stored data, a total-sum changing function for calculating a new total sum of data associated with the block of stored data when new data is stored in the block of stored data, the new total sum of data being based on an equation S.sub.new =S.sub.old +X.sub.new -X.sub.old, where, X.sub.new denotes new data replacing old data X.sub.old, and S.sub.old denotes an old total sum of data associated with the block of stored data before the new data is stored, a parity adding function for calculating a vertical parity associated with the new data, a parity error detecting function for detecting error in the vertical parity, and an error correction function for correcting data stored at an address where an error has been detected by subtracting data stored at all addresses of the block of stored data other than the data stored at the address where the error has been detected from the new total sum of data associated with the block of stored data.

REFERENCES:
patent: 3851306 (1974-11-01), Patel
patent: 4849978 (1989-07-01), Dishon
patent: 5007053 (1991-04-01), Iyer et al.
patent: 5043943 (1991-08-01), Crisp et al.
patent: 5130992 (1992-07-01), Frey, Jr. et al.
patent: 5191584 (1993-03-01), Anderson
patent: 5235601 (1993-08-01), Stallmo et al.
"Use of Non-volatile Semiconductor Storage for Disk Array Parity", Nov. 1990, p. 254, IBM Tech. Disc. Bulletin.
Dishon et al., "A Highly Available Storage System Using the Check Sum Method", Aug. 31, 1987, pp. 176-182, IEEE Computer Society.

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