Methods for improved program-verify operations in...

Details Methods for improved program-verify operations in... Methods for improved program-verify operations in...

2007-05-24

2008-11-04

Nguyen, Viet Q (Department: 2827)

Static information storage and retrieval

Floating gate

Particular biasing

C365S185030, C365S185170, C365S185200, C365S185240

Reexamination Certificate

active

07447081

ABSTRACT:
In programming a non-volatile memory involving alternately applying a programming pulse and verifying the programming, time is saved in the program verify portion when, depending on the states of the memory cells, a portion of the verify operation is recognized to be superfluous and skipped. Preferably, in a program verify operation relative to a demarcation threshold level for demarcating between two memory states, the verify operation includes a sequence of two verify sub-cycles, the first sub-cycle performing a verify relative to a first threshold level at a predetermined margin below the demarcation threshold level and the second sub-cycle performing a verify relative to a second threshold level which is identical to the demarcation threshold level. Unlike conventional cases, the second sub-cycle is not performed until any one memory cell of the group has been verified to pass the first threshold.

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