Use of erasable non-volatile memory for storage of changing info

Details Use of erasable non-volatile memory for storage of changing info Use of erasable non-volatile memory for storage of changing info

1999-02-26

2000-08-15

Nelms, David

Static information storage and retrieval

Floating gate

Particular biasing

36518504, 365 52, G11C 1604

Patent

active

061046388

ABSTRACT:
Non-volatile write-once memory, is used for storage of variable data. In an example embodiment, segmented flash memory is used, in which individual segments can be erased. At least two segments are used. When a segment is nearly full, or when the segment is corrupted, the latest values are written to a new segment. During initialization, all variables of interest are written into RAM with default values. The flash segment being used is read sequentially from oldest entry to newest entry, and values from flash memory are used to overwrite values (or pointers to values) in RAM. RAM then contains (or points to) the most recent value for every variable. When a new segment is written, the new segment is written using the values from RAM. The method provides for identification of the latest (current) value for each stored item of information, provides for adding new types of data and deleting old types of data, provides for action when a memory segment is full, and provides for recovery from power-failure.

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