Patent ID: 7103866

Claim:
A method of designing a semiconductor circuit device, comprising the steps of: generating first circuit data comprising information on a first circuit driven by a voltage from a first power system; generating second circuit data comprising information on a second circuit driven by a voltage from a second power system different from the first power system; obtaining cell data prestored in a storage medium and comprising information on a boundary circuit; and generating boundary circuit connection information indicating that the boundary circuit is connected on a transmission path between the first circuit and the second circuit wherein the boundary circuit comprises a suppressing circuit for suppressing shoot-through current of a boundary between the first circuit and the second circuit, said suppressing circuit including a logic circuit receiving an enable signal in a first state from one of said first circuit and second circuit which is ON for suppressing said shoot-through current of the boundary between said first circuit and second circuit when the other of said first circuit and second circuit is OFF, and receiving an enable signal in a second state for enabling signal transfer between said first and second circuits when each of said first and second circuits are ON.