| 摘要 |
A semiconductor memory device is comprised of a refresh counter for sequentially generating a count value indicating one or more row addresses corresponding to one or more word lines to be refreshed when receiving a refresh request at a predetermined interval in normal operation, in which the refresh counter includes n+1 stage counters assigned to n bits included in the row address and a dummy bit not included in the row address, and a counter portion from the least significant bit to the dummy bit forms an N-ary counter, so as to control whether or not refresh is performed in response to a value of the dummy bit when receiving the refresh request.
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