In a nonvolatile semiconductor memory in which multiple-value information is stored in one memory cell by setting a plurality of threshold values, data is successively read from word lines while continuously changing the word-line read level from a lowest level to a highest level, and the next bit line...http://www.google.fr/patents/US6026014?utm_source=gb-gplus-shareBrevet US6026014 - Nonvolatile semiconductor memory and read method
