Nonvolatile semiconductor memory device having means for selecti

Details Nonvolatile semiconductor memory device having means for selecti Nonvolatile semiconductor memory device having means for selecti

1993-03-29

1997-03-11

Lane, Jack A.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395481, 365218, 36523003, G06F 1200, G11C 1600

Patent

active

056110677

ABSTRACT:
A nonvolatile semiconductor memory device using a NAND-type EEPROM includes a memory unit, a management unit, an erasure unit, and a control unit. The memory unit has a memory cell array divided into blocks each constituting a minimum quantity of data that may be erased. The management unit manages unused blocks. The erasure unit discriminates erased blocks of the unused blocks from non-erased blocks of the unused blocks to erase data stored in the non-erased blocks. The control unit writes data into at least one block of the unused blocks managed by the management unit. In the control unit, when a content of the written data is obtained by changing data recorded in a different block of the memory unit, and the data recorded on the another block is not necessary, the management unit receives information that the different block is an unused block. When the data recorded in the different block is necessary, a necessary part of the data recorded in the different block is copied to a block in which new data is to be written.

REFERENCES:
patent: 3241125 (1966-03-01), Tomasulo et al.
patent: 4685057 (1987-08-01), Lemone et al.
patent: 4755939 (1988-07-01), Watson
patent: 4912629 (1990-03-01), Shuler, Jr.
patent: 5023813 (1991-06-01), Brown, III
patent: 5095512 (1992-03-01), Roberts et al.
patent: 5200959 (1993-04-01), Gross et al.
patent: 5268870 (1993-12-01), Harari
patent: 5270979 (1993-12-01), Harari et al.
patent: 5291584 (1994-03-01), Challa et al.
patent: 5293560 (1994-03-01), Harari
patent: 5297148 (1994-03-01), Harari et al.
patent: 5357475 (1994-10-01), Hasbun et al.

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