Signature circuit for non-volatile memory device

Static information storage and retrieval – Read/write circuit – Bad bit

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Details

36518901, 36518905, 36523001, 365185, 36523003, G11C 2900

Patent

active

052804518

ABSTRACT:
A signature circuit stores signature information indicative of one of a plurality of device functions of a non-volatile memory device which includes first memory cells which are respectively coupled to one of a plurality of word lines and to one of a plurality of bit lines. The signature circuit includes second memory cells which are respectively connected to the bit lines which are grouped into a plurality of blocks, at least one predetermined word line which is provided exclusively for the second memory cells and is connected to each of the memory cells, and a selecting circuit coupled to the bit lines for selecting one of the blocks. The second memory cells in each of the blocks store one kind of signature information, so that a number of blocks is equal to a number of kinds of signature information that can be stored in the signature circuit.

REFERENCES:
patent: 4055802 (1977-10-01), Panousis et al.
patent: 4597063 (1986-06-01), Takemae
patent: 4599709 (1986-07-01), Clemons
patent: 4809227 (1989-02-01), Suzuki et al.
patent: 4887242 (1989-12-01), Hashimoto
patent: 4998223 (1991-03-01), Akaogi
patent: 5023839 (1991-06-01), Suzuki et al.

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