| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect a defective memory cell having deteriorated memory performance quickly and accurately. <P>SOLUTION: A binary-data determination section 26 performs the H/L level determination according to determination results of an access determination section 20, using a level that is offset higher or lower from a central value of H/L levels as a threshold value when that reading access is reading from a first memory area 16a, on the other hand, using an approximately central value of the H/L levels as the threshold value when it is reading from a second memory area 16b. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
