Excavating
Patent
1985-10-25
1988-04-05
Atkinson, Charles E.
Excavating
371 3, G06F 1110
Patent
active
047363762
ABSTRACT:
Encoding/decoding circuitry which processes data and both corrects single errors and detects multiple errors is disclosed. The circuitry is both fail-safe and self-checking in that no internal device failure can alter data without producing improperly encoded outputs and all failures quickly reveal themselves through normal usage even if they do not actually cause any data to be modified. The circuitry can be configured in two identical halves with each half operating on one half of the data so that the circuitry can be advantageously constructed with large scale integrated circuits. Error-detecting information in the form of a syndrome produced by each circuit half is combined with similar syndrome information produced by the other circuit half. The combined syndrome information is then decoded to generate error correction information which is used to modify the data bit outputs to correct detected errors. A failure in either circuit half modifies the combined syndrome information in such a way that the modification can either be detected or else causes no erroneous data bit modification.
REFERENCES:
patent: 4276646 (1981-06-01), Haggard et al.
patent: 4397022 (1983-08-01), Weng et al.
patent: 4553237 (1985-11-01), Nakamura
Golla et al., Self-Checking CRC Generator, IBM Technical Disclosure Bulletin, vol. 15, No. 6, Nov. 1972, p. 1905.
Atkinson Charles E.
Sequoia Systems, Inc.
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