Method for erasing nonvolatile semiconductor memory device incor

Details Method for erasing nonvolatile semiconductor memory device incor Method for erasing nonvolatile semiconductor memory device incor

1996-03-11

1997-11-04

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Bad bit

36518522, 36518529, 365218, G11C 700

Patent

active

056847475

ABSTRACT:
In a nonvolatile memory device, a write operation is performed upon used memory cells. Then, an erase operation is performed upon the used memory cells as well as unused memory cells. Finally, a write operation is performed upon only the unused memory cells.

REFERENCES:
patent: 5347489 (1994-09-01), Merchant et al.
patent: 5357475 (1994-10-01), Hasbun et al.
patent: 5428569 (1995-06-01), Kato et al.
patent: 5485424 (1996-01-01), Kawamura
patent: 5559742 (1996-09-01), Lee et al.

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