Integrated circuit with a data memory protected against UV...

Details Integrated circuit with a data memory protected against UV... Integrated circuit with a data memory protected against UV...

2006-08-31

2008-10-14

Elms, Richard T. (Department: 2824)

Static information storage and retrieval

Floating gate

Data security

Reexamination Certificate

active

07436702

ABSTRACT:
A method protects against a global data erasure an integrated circuit comprising an electrically programmable data memory and a control unit to execute commands for reading or writing in the memory. The method includes the steps of providing, in the integrated circuit, electrically programmable reference memory cells, at putting the integrated circuit into service, storing, in the reference memory cells, bits of determined value forming an authorized combination of bits and, during the operation of the integrated circuit following its putting into service, reading and evaluating the reference memory cells and blocking the integrated circuit if the reference memory cells contain a forbidden combination of bits different from the authorized combination.

REFERENCES:
patent: 5198997 (1993-03-01), Arakawa
patent: 6249456 (2001-06-01), Chehadi
patent: 6556476 (2003-04-01), Na
patent: 0874369 (1998-10-01), None

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