Semiconductor device and semiconductor system

A semiconductor device comprising:

• a reference voltage generation block suitable for determining a level of a reference voltage in response to a first data signal;
• a training block suitable for, in a training mode, buffering an external signal based on the reference voltage and outputting a training signal by latching a buffered external signal in response to a chip select signal;
• a timing control block suitable for, in the training mode, generating a cycle signal by receiving the chip select signal and generating an output timing signal which is enabled at a specified time, based on the cycle signal;
• an output control block suitable for, in the training mode, generating an output control signal of which enable period is determined according to the output timing signal;
• a termination control block suitable for, in the training mode, outputting a termination signal according to a termination control signal and controlling the termination signal such that a termination operation is not performed during the enable period of the output control signal;
• and
• an output driving block suitable for controlling output impedance according to the termination signal and outputting a second data signal by driving the training signal according to the output control signal.