Registers – Systems controlled by data bearing records – Time analysis
Patent
1977-12-22
1979-11-27
Atkinson, Charles E.
Registers
Systems controlled by data bearing records
Time analysis
G06F 1112, G11C 2900
Patent
active
041756924
ABSTRACT:
An error correction and detection system is capable of detecting a miscorrection caused by a triple bit error by using SEC-DED code and is adapted to correct a single bit error and detect a double bit error. When the single bit error is detected from the SEC-DED code read out from a memory, the code is subjected to a retrial process after correction of the error, wherein the corrected SEC-DED code is rewritten in the memory after inversion of the polarity thereof and is read out therefrom. The code read out from the memory undergoes again an error checking process after inversion of the polarity thereof. Repeated detection of an error indicates that the first correction was a miscorrection as caused by the triple bit error.
REFERENCES:
patent: 3648238 (1972-03-01), Yarrington
patent: 3688265 (1972-08-01), Carter et al.
patent: 3825893 (1974-07-01), Bossen et al.
patent: 3949208 (1976-04-01), Carter
patent: 4030067 (1977-06-01), Howell et al.
patent: 4037091 (1977-07-01), Beuscher
patent: 4045779 (1977-08-01), Markle
Atkinson Charles E.
Hitachi , Ltd.
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