Antonelli, Terry, Stout & Kraus, LLP
Nonvolatile semiconductor memory device and data writing method therefor
In a nonvolatile semiconductor memory device wherein a plurality of threshold voltages are set so as to store multivalued information in one memory cell, data is first written into the memory cell whose threshold voltage is the lowest as a written state from the erase level, and data is successively written into memory cells whose threshold voltages are higher.
Renesas Technology Corp. Hitachi ULSI Engineering Corp.
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Shooji Keiichi
Kubono Yoshida