Memory with read protected zones

Details Memory with read protected zones Memory with read protected zones

1997-12-19

1999-12-14

Nelms, David

Static information storage and retrieval

Read/write circuit

Signals

36518907, 365228, G11C 700

Patent

active

060026197

ABSTRACT:
The invention relates to memories associated with the central processing units of microcomputers and more particularly, in such memories, to an architecture and device used to protect certain zones of the memory against unauthorized reading operations. The zones of the memory to which access must be authorized to fulfill certain functions are listed by codes recorded in a first memory. Access to these zones is authorized only if the central processing unit gives corresponding codes through a second memory whose contents are compared with those of the first memory. The invention can be applied to microcomputers and microcontrollers, especially those used in mobile telephone sets.

REFERENCES:
patent: 4683553 (1987-07-01), Mollier
patent: 4975878 (1990-12-01), Boddu et al.
patent: 5452431 (1995-09-01), Bournas
patent: 5467081 (1995-11-01), Drews et al.
patent: 5542081 (1996-07-01), Geronimi
patent: 5594793 (1997-01-01), Bahout
patent: 5729717 (1998-03-01), Tamada et al.
patent: 5754762 (1998-05-01), Kuo et al.
patent: 5812446 (1998-09-01), Tailliet
French Search Report from French Patent Application 96 15931, filed Dec. 24, 1996.

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