| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a nonvolatile semiconductor memory device and a nonvolatile memory system, having a means for preventing erroneous reading of the nonvolatile semiconductor memory device using a multi-value recording system. <P>SOLUTION: In the nonvolatile semiconductor memory device using a multi-value recording system and the nonvolatile memory system, a first verify voltage is used when data are written before a packaging process, and a second verify voltage lower than the first verify voltage is selected when the data are written after the packaging process. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
