| 摘要 |
An address replacing circuit includes a sub-bank region selecting unit that allows a first sub-bank region or a second sub-bank region to be selectively activated, in response to a row address and first and second bits of a column address in accordance with operation modes a first column region activating unit that generates a first column region activating address and a second column region activating address from the first bit of the column address, a second column region activating unit that generates a third column region activating address and a fourth column region activating address from the second bit of the column address, and a column region selecting unit that allows at least one of first to fourth column regions of the first sub-bank region and first to fourth column regions of the second sub-bank region to be selectively activated, in response to the first to fourth column region activating addresses.
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