| 摘要 |
A command receiving circuit receives a command signal for determining a circuit operation, in synchronization with a clock signal and it outputs the received command signal as an internal command signal. An address switching circuit permits transmission of an address signal to an internal circuit upon receiving the command signal. The internal circuit receives the address signal before the reception of the command signal, thereby to start its operation. As a result, the internal circuit can be operated at high speed. Besides, the address switching circuit inhibits the transmission of the address signal to the internal circuit upon receiving the internal command signal or the clock signal. Therefore, even when the level of the address signal has changed after the reception of the command signal, the change does not lead to operating the internal circuit. Accordingly, the power consumption of the semiconductor integrated circuit is reduced. Meanwhile, the semiconductor integrated circuit comprises a plurality of memory cores and a bank switch for selecting the memory cores. The bank switch feeds the address signal to predetermined memory core(s) of the memory cores in accordance with the value of the address signal. Since the memory core can receive the address signal before the validation of a command, the circuit operation is performed at high speed even in the semiconductor integrated circuit including the plurality of memory cores are controlled as bank.
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