| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To restore data using a method different from a conventional method. <P>SOLUTION: A nonvolatile semiconductor memory device includes a memory section comprising a memory cell array in which nonvolatile memory cells are disposed in matrix and having a binary data storage region for storing binary data with single threshold for data identification and a multi-valued data storage region for storing multi-valued data with multiple thresholds for data identification, and a memory controller controlling the memory section. When writing multi-valued data into the multi-valued data storage region, the memory controller also writes data of a low-order page of the multi-valued data into the binary data region. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
