Nonvolatile semiconductor memory device and data processor

Details Nonvolatile semiconductor memory device and data processor Nonvolatile semiconductor memory device and data processor

1995-06-02

1996-10-01

Nelms, David C.

Static information storage and retrieval

Floating gate

Data security

36518509, 36518517, 36518523, 36518524, 36518526, 36518533, G11C 700

Patent

active

055616275

ABSTRACT:
A nonvolatile semiconductor memory device having a redundancy memory cell MC-R and a memory cell MC-C.sub.0 for storing relief data for designating a memory cells MC for which the memory cell MC-R is substituted. In writing the relief data, the memory cell MC-C.sub.0 is selected by a relief bit selection circuit RSEL. The relief data that is written is initially loaded in relief data latch CLAT by the instruction of a reset signal MD2. In normal writing and reading operations, the address comparator circuit ACMP compares the relief data with the address data fed from an external unit. When they are in agreement, the redundancy memory cell MC-R is selected.

REFERENCES:
patent: 5175840 (1992-12-01), Sawase et al.
patent: 5353256 (1994-10-01), Fandrich et al.
patent: 5396499 (1995-03-01), Urai
patent: 5418752 (1995-05-01), Harari et al.
patent: 5444664 (1995-08-01), Kuroda et al.
patent: 5450354 (1995-09-01), Sawada et al.

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