| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a nonvolatile semiconductor memory device and its control method, a nonvolatile semiconductor memory device system and its control method in which a lifetime being same as that of a magnetic disk device is realized and high reliability can be secured. <P>SOLUTION: This device is provided with a plurality of memory cells 41-48 in which one end is connected to a source line and the other end is connected to a bit line, and adjacent source and drain are connected mutually, and a control means in which information 45 related to a file storage position is written successively in memory cell regions 41-48 previously erased in the direction from the memory cell 48 of a source line side to the memory cell 41 of a bit line side whenever the regions are updated, write-in data 45 in a position being closet to the bit line is made the latest relation information. <P>COPYRIGHT: (C)2003,JPO</p> |
