| 摘要 |
A semiconductor memory that shortens refresh operation time. A REF-ACT comparison circuit for addresses compares a refresh request signal srtz and an active request signal atdpz and immediately outputs a refresh address import signal ialz to a row-add latch circuit in the case of the refresh request signal srtz having been input prior to the active request signal atdpz. A REF-ACT comparison circuit for commands compares a delayed refresh request signal srtdz obtained by delaying the refresh request signal srtz and the active request signal atdpz, outputs a refresh execution request signal refpz in the case of the delayed refresh request signal srtdz having been input prior to the active request signal atdpz, and outputs an active execution request signal actpz in the case of the active request signal atdpz having been input prior to the delayed refresh request signal srtdz.
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