Semiconductor integrated circuit and method of designing the same

A method of designing a semiconductor integrated circuit which comprises a first circuit block, a first power wire for supplying power to circuitry within the first circuit block, and a second power wire of a power system that differs from a power system of the first power wire, wherein the first power wire and a third power wire are provided with the first circuit block, wherein the third power wire has a bent portion, is separate from the first power wire, and has the same power system as the second power wire, wherein the third power wire comprises a first edge that extends in a first direction and that is connected to the second power wire that extends in a second direction, and a second edge that extends in the second direction and that is connected to the first edge, the method comprising:

• determining a position of the first circuit block;
• and
• automatically placing the second power wire such that the second power wire is connected to the third power wire after said determining a position of the circuit block,
• wherein the second power wire and the third power wire form a second encircling power wire, and
• wherein the first power wire comprises a first encircling power wire that is disposed outside the perimeter of the second encircling power wire.

A method of designing a semiconductor integrated circuit, comprising:

• determining a position of a first circuit block;
• providing the first circuit block;
• providing a first power wire for supplying power to circuitry within the first circuit block, wherein the first power wire is provided within the first circuit block;
• providing a third power wire within the first circuit block, wherein the third power wire is separated from the first power wire, wherein the third power wire has the same power system as a second power wire, and wherein the third power wire has a bent portion, part of which extends in a first direction;
• determining a position of a second circuit block;
• and
• then automatically placing the second power wire that extends in a second direction such that the second power wire is connected to the third power wire, wherein the second power wire is of a power system that differs from a power system of the first power wire,
• wherein the second circuit block is supplied with power by a second encircling power wire that comprises the second power wire and the third power wire, and
• wherein the first power wire comprises a first encircling power wire that is disposed outside the perimeter of the second encircling power wire.