Semiconductor memory device and method of controlling the same
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United States of America Patent
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Nov 17, 2015
Grant Date -
Sep 17, 2015
app pub date -
Jun 3, 2014
filing date -
Mar 12, 2014
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Abstract
A semiconductor memory device according to an embodiment comprises: a nonvolatile memory cell capable of multi-level storage; and a control circuit that performs write control on the memory cell. The control circuit executes: a first write operation to obtain a certain intermediate voltage distribution; a second write operation to obtain a final voltage distribution; and a change operation that changes a value of the first verify voltage according to the number of times of writes and the number of times of erases on the memory cell.
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