Patent ID: 7859284

Claim:
A semiconductor module comprising a plurality of semiconductor devices, the semiconductor module selecting a first semiconductor device and a second semiconductor device connected to each other by internal wires from the plurality of the semiconductor devices mounted therein and testing a connection state of the internal wires, wherein the first semiconductor device comprises: first semiconductor device internal connection terminals which are connected to the second semiconductor device through the internal wires; an external connection terminal which is connected to a terminal of the semiconductor module and is supplied with an external supply potential; and first connection switches which connect to-be-tested first semiconductor device internal connection terminals, selected from the first semiconductor device internal connection terminals, and the external connection terminal, the second semiconductor device comprises: second semiconductor device internal connection terminals which are connected to the first semiconductor device through the internal wires; and second connection switches which supply a reference potential to to-be-tested second semiconductor device internal connection terminals connected to the to-be-tested first semiconductor device internal connection terminals through the internal wires when in a first state, and supply the reference potential to the second semiconductor device internal connection terminals other than the to-be-tested second semiconductor device internal connection terminals when in a second state.