Method of modifying data stored in non-volatile memory and testi

Details Method of modifying data stored in non-volatile memory and testi Method of modifying data stored in non-volatile memory and testi

1980-08-20

1983-07-12

Shaw, Gareth D.

Excavating

371 66, 364900, 365 1, G06F 1110, G11C 2900

Patent

active

043935001

ABSTRACT:
A method and system for rewriting data in a non-volatile memory of the type which requires a comparatively long period of time for the rewriting of stored data. The occurrence of an interruption in power can be detected on the basis of the content of the non-volatile memory, and detection takes place after the resumption of power even if the interruption in power takes place during the rewriting operation. The non-volatile memory is provided with a flag area in which information indicating the initiation of a modification is written prior to the rewriting operation, and in which information indicating the termination of a modification is written after the rewriting operation, whereby an interruption in power which has occurred during rewriting is readily detected by reading out the information from the flag area after the restoration of power.

REFERENCES:
patent: 4216541 (1980-08-01), Clover
patent: 4218764 (1980-08-01), Furuta
patent: 4231089 (1980-10-01), Lewine
Byram and Ruiz, Detection of and Recovery From Data Discontinuity, IBM Tech. Disclosure Bulletin, vol. 20, No. 2, Jul. 1977.

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