| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving method and a driving system that avoid over-writing of a phase change memory. <P>SOLUTION: The method includes counting the number of accesses to the phase change memory (including the number of RESET, the number of SET, or the number read), and refreshing it when the number of accesses is larger than a first predetermined value, in which SET and RESET operations are successively performed. Thereby, the phase change memory is prevented from being excessively crystallized or non-crystallized. <P>COPYRIGHT: (C)2008,JPO&INPIT |
