| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a storage device which improves the adjustment ability of the resistance value level upon recording and perform a stable verify control. <P>SOLUTION: A WL adjustment circuit 24 increases (byΔVWL) the VWL supplied from a second power source 22 to a control terminal 20c of a transistor 20 for each re-recording by verify control. When a variable resistance element 10 can perform multi-value recording, theΔVWL value is different for each resistance value level of the multi-value information. That is, theΔVWL is varied according to a change width of a recording resistance of the variable resistance element 10 caused by a current. TheΔVWL value is small in a region where the recording resistance change width is large (the voltage VGS between a source and a gate of the transistor 20 is small) while theΔVWL value is large in a region where the recording resistance change width is small (the VGS is large). <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
