Single end signal communication is provided in a first direction from a single end signal transmitter to a single end signal receiver through at least one dumping resistor and may be provided in another direction from another single end signal transmitter to another single end signal receiver through the at least one dumping resistor. During the single end signal communication, differential signal transmitters and differential signal receivers are disabled so that the communication path of the differential signal has a high impedance. Differential signal communication is also provided in the first direction from one of the differential signal transmitters to one of the differential signal receivers through a first termination resistor that also serves as the dumping resistor and may be provided in the another direction from another of the differential signal transmitters to another of the differential signal receivers through another termination resistor that also serves as another dumping resistor. During the differential signal communication, the single end signal transmitters and the single end signal receivers are disabled so that the communication path of the single end signal has a high impedance.