Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1989-07-10

1990-07-17

Fears, Terrell W.

Static information storage and retrieval

Read/write circuit

Bad bit

365 49, 365207, 371 101, G11C 1300

Patent

active

049425560

ABSTRACT:
In a defect relieving technology which replaces defective memory cells of a semiconductor memory device by spare memory cells, use is made of an associative memory. Address information of a defective memory cell is stored as a reference data of the associative memory, and new address information of a spare memory cell is written down as output data of the associative memory. A variety of improvements are made to the associative memory. For instance, a plurality of coincidence detection signal lines of the associative memory are divided into at least two groups, and one group among them is selected by switching means. Reference data of the associative memory comprises three values consisting of binary information of "0" and "1", and don't care value "X". The associative memory further includes a plurality of electrically programable non-volatile semiconductor memory elements.

REFERENCES:
patent: 4168541 (1979-09-01), DeKarske
patent: 4310901 (1982-01-01), Harding et al.
patent: 4622653 (1986-11-01), McElroy
patent: 4685082 (1987-08-01), Cheung et al.
patent: 4758982 (1988-07-01), Price

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