A semiconductor device and a semiconductor system

The semiconductor device is a write command is generated to generate a buffer control signal that enables the setup period in synchronization with the elapsed time from the time the buffer-control-signal generating circuit; Input control signal generation circuit for receiving a first data strobe signal and a second input the data strobe signal in response to the buffer control signal generating first to fourth control signal input thereto; And an internal data generation circuit for generating internal data, receiving the data in synchronization with the first to fourth input control signal.