| 摘要 |
PROBLEM TO BE SOLVED: To improve a relief rate of defective parts. SOLUTION: Spare sectors 12a-12h in which spare memory cell columns are arranged respectively are arranged corresponding to sectors 11a-11h in which plural memory cell columns are arranged in parallel. Decoders 13a-13h are connected to the sectors 11a-11h and the spare sectors 12a-12h respectively, and a specific memory cell column in the sectors 11a-11h is specified responding to column address information CA. At the time, memory cell columns in the sectors 11a-11h are replaced by spare memory cells in the spare sectors 12a-12h responding to replacement information held in decoders 11a-11h.
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