Method and circuit for protecting circuit configurations having

Details Method and circuit for protecting circuit configurations having Method and circuit for protecting circuit configurations having

1994-07-15

1996-03-05

Canney, Vincent P.

Static information storage and retrieval

Magnetic bubbles

Guide structure

365201, G06F 1100

Patent

active

054974623

ABSTRACT:
In a method and circuit for protecting circuit configurations having an electrically programmable non-volatile memory used as a non-volatile counter, an access check is provided in the circuit configuration by comparison of a check code to be fed in with a secret code. Each counter bit is evaluated immediately after programming the counter bit. A protected function is disabled in dependence on the recognition of the counter bit as written. The reading level is set during the evaluation of a particular counter bit to be more-critical than in all of the later reading operations of the counter bit.

REFERENCES:
patent: 4279024 (1981-07-01), Schrenk
patent: 4460982 (1984-07-01), Gee et al.
patent: 4755815 (1988-07-01), Savoyet et al.

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