Static information storage and retrieval – Read/write circuit – Bad bit
Patent
1998-02-23
1999-05-25
Nelms, David
Static information storage and retrieval
Read/write circuit
Bad bit
3652257, 365 96, 327525, 326 38, 326 39, 326 41, G11C 700
Patent
active
059075139
ABSTRACT:
A semiconductor memory device including redundancy decision circuitry having a block writing function is disclosed. The redundancy decision circuitry assigns a single fuse and a single transistor to each pair of upper and lower bits of a plurality of column addresses. Selectors each selects either one of particular upper and lower bits input thereto. The device therefore reduces the number of fuses corresponding to column mask signals to be used at the time of block writing, thereby reducing the area to be occupied by the redundancy decision circuitry.
REFERENCES:
patent: 5768198 (1998-06-01), Moroo
NEC Corporation
Nelms David
Nguyen Vanthu
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