| 摘要 |
PROBLEM TO BE SOLVED: To prevent surely malfunction and to improve largely reliability independently of a state of a signal inputted to an external input terminal at the time of applying a power source. SOLUTION: When a power source is applied, a non-active signal is outputted from a reverse RAS buffer circuit 13, a reverse CAS buffer circuit 14, a reverse WE buffer circuit 15, and a reverse OE buffer circuit 16 independently of signal states of a row address strobe signal reverse RAS, a column address strobe signal reverse CAS, a write-enable signal reverse WE, and an output-enable signal reverse OE being control signals externally inputted. In an initial cycle, when the row address strobe signal reverse RAS is transited to perform a first time reverse RAS only refresh, receiving a control signal externally inputted is started.
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