Reliable method for erasing a flash memory

Details Reliable method for erasing a flash memory Reliable method for erasing a flash memory

2008-01-29

2008-01-29

Le, Thong Q. (Department: 2827)

Static information storage and retrieval

Floating gate

Particular biasing

C365S033000, C365S185230

Reexamination Certificate

active

11308668

ABSTRACT:
A method for erasing a flash memory group is provided, which comprises the following steps. (a) Apply a erase (ERS) pulse to a first subset of the group. (b) Perform one of a soft program verification (SPGMV) and a tight soft program verification (TSPGMV) on the first subset of the group. (c) Repeat steps (a) and (b) until a first predetermined condition is true. (d) Perform an erase verification (ERSV) on a second subset of the group. (e) Repeat steps (a) to (d) until a second predetermined condition is true. And (f) fix bit line leakage in a third subset of the group with a slow program (SLPGM) and apply an ERS pulse to the third subset.

REFERENCES:
patent: 6055190 (2000-04-01), Lu et al.
patent: 2002/0141236 (2002-10-01), Nakai et al.
patent: 2007/0086251 (2007-04-01), Lutze et al.

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