| 摘要 |
According to an aspect of the present invention, a redundant file memory for recording first replacement information having an address of a defective cell to be replaced with a redundant cell is configured by a memory cell having the same configuration as an ordinary memory cell, and when accessing the ordinary memory cell, the redundant file memory can be accessed at the same time. Furthermore, second replacement information indicating whether or not the ordinary cell in correspondence with the stored address is a defective one is recorded in the redundant file memory. When accessing the ordinary memory cell, the first and second replacement information recorded in the redundant file memory are read out at the same time, and the defective cell is replaced with the redundant cell according to the replacement information.
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