PROCEDE POUR LA MEMORISATION DE DONNEES DANS UNE MEMOIRE EFFACABLE ELECTRIQUEMENT ET MEMOIRE EFFACABLE ELECTRIQUEMENT POUR LA MISE EN OEUVRE DU PROCEDE

Method and apparatus of storing data in an electrically erasable memory connected to a microprocessor to effectively protect data stored in the memory from being unintentionally overwritten in cases of defective operation of the microprocessor, an overwrite protection system consisting of a write pr...

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Bibliographic Details
Main Author ERICH KNOTHE, FRANZ-JOSEF MELCHER ET CHRISTIAN OLDENDORF
Format Patent
LanguageFrench
Published 20.05.1994
Edition5
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
PHYSICS
STATIC STORES
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Summary:Method and apparatus of storing data in an electrically erasable memory connected to a microprocessor to effectively protect data stored in the memory from being unintentionally overwritten in cases of defective operation of the microprocessor, an overwrite protection system consisting of a write protect flip-flop (1) whose two logical states signify "with write protection" and "without write protction" and also a gate (3) in the write line which is controlled by the write protect flip-flop and in whose logical "with write protection" state, write errors are prevented from being conducted to the individual memory locations, and, finally a mechanical switch element (5) whereby these components are connected in such a manner that the write protect flip-flop (1) can only be brought into the one logical "with write protection" state by the microprocessor, while it can only be brought into the other logical "without write protection" state, if and when the mechanical switch element (5) is actuated. The overwrite protection can apply depending on the embodiment to the entire electronically erasable memory or only to the subareas thereof.
Bibliography:Application Number: FR19860005576