Nonvolatile memory and method for improved programming with reduced verify

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United States of America Patent

PATENT NO 9324418
APP PUB NO 20130279263A1
SERIAL NO

13925621

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Abstract

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A group of memory cells of a nonvolatile memory is programmed in parallel in a programming pass with a minimum of verify steps from an erased state to respective target states by a staircase waveform. The memory states are demarcated by a set of increasing demarcation threshold values (V1, . . . , VN). Initially in the programming pass, the memory cells are verified relative to a test reference threshold value. This test reference threshold has a value offset past a designate demarcation threshold value Vi among the set by a predetermined margin. The overshoot of each memory cell when programmed past Vi, to be more or less than the margin can be determined. Accordingly, memory cells found to have an overshoot more than the margin are counteracted by having their programming rate slowed down in a subsequent portion of the programming pass so as to maintain a tighter threshold distribution.

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Patent Owner(s)

  • SANDISK TECHNOLOGIES LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dong, Yingda San Jose, US 252 4794
Hsu, Cynthia Milpitas, US 28 379
Oowada, Ken Fujisawa, JP 69 799

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