| 摘要 |
<P>PROBLEM TO BE SOLVED: To relieve not only initial fault caused in a test but one part of accidental fault and abrasion fault caused in a user. <P>SOLUTION: By providing a redundant information recording region 108 being writable in a user mode and storing redundant information of a redundant cell array region106, when rewriting in a user mode is made defective, reading of redundant information indication whether redundant replacement can be performed after redundant replacement at the time of a test is performed, when redundant replacement can be performed, new redundant information can be written in the redundant information storing region 108. Thereby, a redundant cell array region 106 being not used at the time of a test can be used effectively, not only initial fault caused in a test but one part of accidental fault and abrasion fault caused in a user can be relieved. <P>COPYRIGHT: (C)2004,JPO |
