Semiconductor integrated circuit and semiconductor integrated circuit manufacturing method

A semiconductor integrated circuit comprising:

• basic cell rows in which a plurality of circuit blocks are placed, arranged in a plurality in a first direction;
• a wiring placement area formed between adjacent said basic cell rows in said first direction;
• reference power supply wiring that extends in a second direction in said wiring placement area and supplies a reference power supply to said circuit blocks;
• first power supply wiring that extends in said second direction in said wiring placement area and supplies a first power supply of higher voltage than said reference power supply to said circuit blocks;
• and
• second power supply wiring that extends in said second direction in said wiring placement area and supplies a second power supply of higher voltage than said first power supply to said circuit blocks.

A semiconductor integrated circuit manufacturing method comprising:

• a step of placing first power supply wiring that supplies a first power supply and second power supply wiring that supplies a second power supply of higher voltage than said first power supply;
• a step of placing a plurality of circuit blocks;
• a step of connecting said plurality of circuit blocks to first power supply wiring;
• a step of extracting a circuit block that includes a critical path among said plurality of circuit blocks;
• and
• a step of replacing connection of said circuit block that includes a critical path to first power supply wiring with connection of said circuit block that includes a critical path to second power supply wiring.