Nonvolatile semiconductor memory device capable of uniformly inputting/outputting data
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United States of America Patent
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Feb 6, 2007
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app pub date -
Jan 25, 2005
filing date -
May 23, 2002
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Abstract
At the time of an operation of writing data to a specific memory cell in a memory block, a semiconductor memory device applies a write voltage for a predetermined period and, after that, performs a verifying operation by using a sense amplifier circuit and a comparator. When it is found as a result of the verifying operation that writing to the memory cell is insufficient, the writing operation is performed again by an instruction of a memory control circuit. At this time, the memory control circuit adjusts a write voltage.
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