Multichip module

A selector has the first input terminal to which a test signal is given, the second input terminal connected to an output terminal of the first internal logic circuit, and an output terminal connected via a wiring to an input terminal of the second internal logic circuit. Another selector has an input terminal connected to the wiring, another input terminal connected to an output terminal of the second internal logic circuit, and an output terminal connected via another wiring to a signal input terminal of the second internal logic circuit. Each of the selectors selectively outputs a signal given to its first input terminal or a signal given to its second input terminal B based on a test mode signal.