| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of fuse sets in a chip while securing a high yield. SOLUTION: A semiconductor memory is provided with eight banks; bank0, bank1,... bank7 which are simultaneously accessed. Two fixed spare row decoders 14F and two mapping spare row decoders 14M are arranged in each bank. Two fixed fuse sets 15F are provided in each bank corresponding to the fixed spare row decoder 14F. For example, eight mapping fuse sets 15M are provided in a semiconductor memory independently of the number of mapping spare row decoders 14M. Mapping information deciding that which banks the mapping spare row decoder 14M corresponds to is stored in the mapping fuse set 15M.
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