Verfahren und vorrichtung zum schutz der daten eines rom

Protecting data stored in ROM - using code stored in user programme with checks on data and addresses

Abstract

The output of a ROM (2) is coupled to a data output circuit (4) via a bus (11) and connects to a programme counter (7) and a -security code address comparator (8) over an address bus (10). A further comparator (3) connects to a status output circuit (9) to check on the security code data status bit. The security code information is included in the use programme and is located at a specific address in the memory. Checks are made using the comparators to determine correct form of address and the data. ADVANTAGE - Double check on security data and address.

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    DE-3512785-A1October 23, 1986Telefonbau & Normalzeit GmbhMethod for access protection

NO-Patent Citations (1)

    Title
    Evans J., et al, Protection of Memories on a Word Basis, in IBM Technical Disclosure Bulletin, Vol. 7, No. 6, November 1964, S. 438 u. 439

Cited By (0)

    Publication numberPublication dateAssigneeTitle