Setup/hold time control circuit

A setup/hold time control circuit is provided to improve the setup / hold time difference of each port by including a setup / hold time control circuit. In a setup/hold time control circuit, a reference signal output unit(10) set one of a plurality of ports as a reference port and buffers signal inputted through the reference port. The comparison signal output unit(20) the other ports as comparison port and synchronizes a signal inputted through the comparison ports to the reference signal, and then outputs it as an internal signal.