Method and apparatus for the protection of non-volatile memory z

Details Method and apparatus for the protection of non-volatile memory z Method and apparatus for the protection of non-volatile memory z

1996-03-28

1998-09-22

Dinh, Son T.

Static information storage and retrieval

Floating gate

Data security

365195, 365196, G11C 700

Patent

active

058124462

ABSTRACT:
The disclosure relates to integrated circuits and methods in which it is desired to implement a partition of a memory between a protected zone and a non-protected zone, the dimensions of the protected zone being defined by a customer of the memory. A disclosed method avoids the use of special instructions to define these dimensions. The method includes writing sensitive information elements by starting at an address ADP, and ending at an address ADFM dictated by the circuit. The writing in the address ADFM automatically triggers a sequence for storing, in a non-volatile register RV, the first written address, and a sequence for the activation of a system for the protection of the zone between the addresses ADP and ADFM.

REFERENCES:
patent: 5363334 (1994-11-01), Alexander et al.
patent: 5559992 (1996-09-01), Stutz et al.
patent: 5592641 (1997-01-01), Fandrich et al.
French Search Report from French Patent Application 95 03863, filed Mar. 31, 1995.

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