Method and apparatus for redundancy word line replacement in a r

Details Method and apparatus for redundancy word line replacement in a r Method and apparatus for redundancy word line replacement in a r

1998-03-24

1999-10-05

Nelms, David

Static information storage and retrieval

Read/write circuit

Bad bit

365149, 371 103, G11C 700

Patent

active

059634898

ABSTRACT:
A method and apparatus for repairing a semiconductor memory device. A row redundancy replacement arrangement is provided to repair the memory device consisting of a first plurality of redundant true word lines and a second plurality of redundant complement word lines to simultaneously replace the same first number of first normal word lines and the same second number of the normal complement word lines. An address reordering scheme, preferably implemented as a word line selector circuit and controlled by redundancy control logic and address inputs, allows the redundant true (complement) word lines to replace the normal true (complement) word lines when making the repair. The redundancy replacement arrangement ensures that consistency of the bit map is maintained at all times, irrespective whether the memory device operates in a normal or in a redundancy mode. This approach introduces an added flexibility of incorporating the redundancy replacement without affecting the column access speed.

REFERENCES:
patent: 5289417 (1994-02-01), Ooishi et al.
patent: 5295114 (1994-03-01), Kobayashi
patent: 5414659 (1995-05-01), Ito
patent: 5465234 (1995-11-01), Hannai
patent: 5555212 (1996-09-01), Kirihata et al.

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