Semiconductor memory device having security function

Details Semiconductor memory device having security function Semiconductor memory device having security function

1995-09-21

1998-11-17

Nelms, David C.

Static information storage and retrieval

Floating gate

Data security

36518907, 365195, G11C 1134

Patent

active

058386130

ABSTRACT:
A non-volatile semiconductor memory device includes first, second and third comparators, counter and ring oscillator. The first comparator compares an input address with an access inhibition address. The counter counts the number of changes of addresses input after coincidence of the addresses when the first comparator detects the coincidence of the addresses. The second comparator compares the count number of the counter with a preset count number and operates the ring oscillator when the count numbers coincide with each other. The third comparator compares the cycle number of the ring oscillator with a preset cycle number and scrambles the input address to output error data when the cycle numbers coincide with each other.

REFERENCES:
patent: 4864542 (1989-09-01), Oshima et al.
patent: 5155829 (1992-10-01), Koo
patent: 5175840 (1992-12-01), Sawase et al.
patent: 5216633 (1993-06-01), Weon et al.
patent: 5377343 (1994-12-01), Yaezawa

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