Semiconductor memory having redundancy function in block write o

Details Semiconductor memory having redundancy function in block write o Semiconductor memory having redundancy function in block write o

1997-07-14

1998-06-16

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Bad bit

3652257, 36523003, G11C 700

Patent

active

057681988

ABSTRACT:
A redundancy check circuit is composed of the fuses corresponding to more significant column addresses and the fuses corresponding, for the ordinary write operation, to lesser significant column and also corresponding, for the block write operation, to the column mask signal. Thereby, during the block write operation, the lesser significant column addresses are invalidated and the redundancy signal can be outputted depending on the redundancy check result and the column mask check result of more significant addresses.

REFERENCES:
patent: 5319606 (1994-06-01), Bowden et al.
patent: 5590085 (1996-12-01), Yuh et al.
patent: 5657279 (1997-08-01), Savignac et al.
patent: 5699306 (1997-12-01), Lee et al.

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