Static information storage and retrieval – Floating gate – Particular biasing
Patent
1999-07-01
2000-08-22
Fears, Terrell W.
Static information storage and retrieval
Floating gate
Particular biasing
36518529, G11C 1300
Patent
active
061082414
ABSTRACT:
Leakage detection for cells in a flash memory device. According to one embodiment of the present invention a method includes reading a flash cell in a read cycle in a flash memory device to generate a read signal, generating several reference signals, comparing the read signal with each of the reference signals in the read cycle, generating a data signal based on the comparison to indicate data stored in the flash cell, and generating a refresh signal based on the comparison to request a refresh of the flash cell if the flash cell is leaky. According to another embodiment of the present invention a flash memory device includes a number of flash cells, a read circuit to generate a read signal in a read cycle of the flash memory device by reading a selected one of the flash cells, a reference circuit to generate a plurality of reference signals, and a comparing circuit to compare the read signal with each of the reference signals in the read cycle to generate a data signal indicating data stored in the selected flash cell and to generate a refresh signal if the selected flash cell is leaky.
REFERENCES:
patent: 5317535 (1994-05-01), Talreja et al.
patent: 5434815 (1995-07-01), Smarandoiu et al.
patent: 5617350 (1997-04-01), Roohparvar et al.
patent: 5715193 (1998-02-01), Norman
Fears Terrell W.
Micro)n Technology, Inc.
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