Static information storage and retrieval – Floating gate – Multiple values
Reexamination Certificate
2007-01-22
2009-08-04
Hoang, Huan (Department: 2827)
Static information storage and retrieval
Floating gate
Multiple values
C365S185180, C365S185280, C365S185240
Reexamination Certificate
active
07570514
ABSTRACT:
A method of operating a multi-level cell is provided. The method includes the following the steps. (a) The multi-level cell is operated until a threshold voltage is larger than a pre-programming threshold voltage. And (b) the multi-level cell is operated until the threshold voltage is larger than a target programming threshold voltage and smaller than the pre-programming threshold voltage. Moreover, between the step (a) and the step (b), further comprises (c) A first verification step is performed. If the threshold voltage is smaller than the pre-programming threshold voltage, then repeat the step (a). Furthermore, after the step (b), further comprises (d) a second verification step is performed. If the threshold voltage is larger than the pre-programming threshold voltage, repeat the step (b), and if the threshold voltage is smaller than the target programming threshold voltage, repeat the steps (a)-(d).
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Kuo Ming-Chang
Wu Chao-I
Hoang Huan
J.C. Patents
Macronix International Co. Ltd.
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