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Method for designing semiconductor circuit device, utilizing boundary cells between first and second circuits driven by different power supply systems

  • US 7,103,866 B2
  • Filed: 04/23/2004
  • Issued: 09/05/2006
  • Est. Priority Date: 05/09/2003
  • Status: Expired due to Fees
First Claim
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1. 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.

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