Patent ID: 7532013

Claim:
A semiconductor integrated circuit for receiving a signal having been propagated through a transmission line, comprising: a logic circuit that performs a logical operation; a first input/output terminal connected to the logic circuit; a second input/output terminal connected to the logic circuit; a differential input receiver circuit having an output connected to the logic circuit, receiving the signal having been propagated through the transmission line, and outputting the signal to the logic circuit; a terminator resistor connected between a non-inverting input terminal and an inverting input terminal of the differential input receiver circuit to achieve impedance matching with the transmission line; a third input/output terminal connected to the non-inverting input terminal of the differential input receiver circuit to receive the signal; a fourth input/output terminal connected to the inverting input terminal of the differential input receiver circuit to receive the signal; a first switching circuit connected between the logic circuit and the first input/output terminal; a second switching circuit connected between the logic circuit and the second input/output terminal; a third switching circuit connected between the first input/output terminal and the third input/output terminal; a fourth switching circuit connected between the second input/output terminal and the fourth input/output terminal; and a control circuit that controls on/off of the first to fourth switching circuits, wherein the control circuit turns off the first switching circuit and the second switching circuit and turns on the third switching circuit and the fourth switching circuit in a test operation mode for measuring a resistance value of the terminator resistor, and the control circuit turns on the first switching circuit and the second switching circuit and turns off the third switching circuit and the fourth switching circuit in a normal operation mode for a normal operation.