In a memory cell array, a plurality of memory cells are arranged in a matrix. Each of the plurality of memory cells stores one of a plurality of threshold levels. When writing one of the plurality of threshold levels into a first memory cell of the memory cell array, a control circuit writes a threshold...http://www.google.fr/patents/US7768829?utm_source=gb-gplus-shareBrevet US7768829 - Semiconductor memory device for storing multilevel data
Semiconductor memory device for storing multilevel data
