Nonvolatile semiconductor memory device

Details Nonvolatile semiconductor memory device Nonvolatile semiconductor memory device

1993-07-01

1995-01-03

Fears, Terrell W.

Static information storage and retrieval

Addressing

365200, 36523003, G11C 1140, G11C 1300

Patent

active

053792629

ABSTRACT:
A nonvolatile semiconductor memory device including a memory means having a plurality of storage areas divided in a capacity serving as a management unit, a first managing means for, when data is to be written in the storage areas, circularly arranging the plurality of storage areas such that the plurality of storage areas physically or logically arranged, and managing the storage areas such that the plurality of storage areas are used in accordance with an order of an arrangement of the plurality of storage areas, a second managing means for managing whether data recorded in the plurality of storage areas is changed after a predetermined timing, and a control means for, when data is written in the storage area and a predetermined condition is satisfied, selecting a storage area having data which is not changed after a timing when the second managing means is initialized, moving the data in the selected storage area to another storage area, and initializing the second managing means when data in all the storage areas are assumed to be changed.

REFERENCES:
patent: 5278794 (1994-01-01), Tanaka et al.

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