Nonvolatile semiconductor memory having partial data...

Details Nonvolatile semiconductor memory having partial data... Nonvolatile semiconductor memory having partial data...

2005-09-27

2005-09-27

Nguyen, Viet Q. (Department: 2827)

Static information storage and retrieval

Read/write circuit

Including signal comparison

C365S189011, C365S230080

Reexamination Certificate

active

06950349

ABSTRACT:
A nonvolatile semiconductor memory is provided with a main memory array and a sub-memory array. When rewriting a portion of data having been written in the main memory cell array, a modification data is written into the sub-memory cell array without erasing said main memory cell array. Further, correspondent information on a first address of the main memory cell array storing a data to be modified and a second address of the sub-memory cell array storing the modification data is recorded. At the time of a readout operation, a readout address is compared with the first address recorded in the correspondent information. When said comparison result indicates consistency, a data in the sub-memory cell array of the second address corresponding to the first address is read out. Otherwise, when the comparison result indicates inconsistency, a data in the main memory cell array corresponding to the readout address is read out.

REFERENCES:
patent: 5309393 (1994-05-01), Sakata et al.
patent: 5485595 (1996-01-01), Assar et al.
patent: 5563828 (1996-10-01), Hasbun et al.
patent: 5838614 (1998-11-01), Estakhri et al.
patent: 5907856 (1999-05-01), Estakhri et al.
patent: 6223308 (2001-04-01), Estakhri et al.
patent: 6772274 (2004-08-01), Estakhri
patent: 08-315596 (1996-11-01), None
patent: 409045091 (1997-02-01), None
patent: 02001118391 (2001-04-01), None
patent: 2002016232 (2002-01-01), None

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