Storage device and method to detect its degradation

Details Storage device and method to detect its degradation Storage device and method to detect its degradation

1996-12-04

1998-11-24

Lane, Jack A.

Static information storage and retrieval

Floating gate

Particular biasing

365201, 711103, G11C 2900, G11C 1600

Patent

active

058416994

ABSTRACT:
The storage device of the present invention comprises: an interface circuit, a memory comprising a plurality of block-erase type, nonvolatile memories, a control circuit for managing and controlling the memory, and an address conversion table. The control circuit searches for an erase block with an empty area and issues a command signal to the memory to cause the memory to apply voltage pulses to the selected erase block. The memory checks to determine whether or not the erase operation has been completed every time the voltage pulse is applied to the erase block, and if the erase operation has not been completed, the control unit issues another command signal to cause the memory to apply another voltage pulse to the erase block and thus determines the level of degradation of the erase characteristic of the erase block based on the number of voltage pulses applied to that erase block.

REFERENCES:
patent: 5740396 (1998-04-01), Mason

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