| 摘要 |
at least two redundancy cell array drivers(54,56) each of which is connected to a redundancy memory cell array to drive it; a defective cell array detecting fuse box(16) for detecting an address corresponsing to a defective memory cell array; a block selection fuse box(18) for selecting a memory block including the defective memory cell; and a driving controller(50) for selectively driving one of the redundancy cell array drivers by the outputs of the defective cell array detecting fuse box and block selective fuse box.
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