SEMICONDUCTOR MEMORY

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor memory where an operation is surely guaranteed and power consumption is reduced. SOLUTION: An external command latch circuit 23 latches an external command COM from an external command input buffer 22 in synchronism with a clock signal CLKZ. A command decoder 24 decodes the command COM which is latched by the circuit 23. A data input buffer 11 receives write data DQ and outputs the data DQ to first and second data latch circuits 13 and 14. A data strobe signal input buffer 12 outputs a data strobe signal DQS to the circuits 13 and 14 as a latch signal. A write command discriminating circuit 26 generates a first enable signal DSZ to active data input and clock signal input buffers 11 and 12 when the command COM inputted from the buffer 22 is a write command.