Method of designing semiconductor integrated circuit and semiconductor integrated circuit

Abstract

A method is provided for designing a semiconductor integrated circuit having a logic macro-cell ( ), a circular power source wiring ( ) disposed around the logic macro-cell ( ) in a ring shape and a signal wiring ( ) that traverses the circular power source and is led out from the logic macro-cell to an outside. The circular power source wiring ( ) is formed from a first layer Al wiring having a priority wiring direction extending in a lateral direction and a second layer Al wiring having a priority wiring direction extending in a vertical direction. The method includes: the first step of inputting in a library definitions required for automatic placing and routing; the second step of inputting the library and a net list in an automatic placing and routing apparatus; the third step of determining a placement of the logic macro-cell ( ); the fourth step of determining the circuit power source wiring ( ) according to the priority wiring directions; and the fifth step of determining the signal wiring ( ) according to the priority wiring directions. The first step includes the step of inputting definitions for positions of vias ( and ) that mutually connect the first and second layer Al wirings that form the circuit power source wiring ( ). The third step includes the step of designating an orientation of the logic macro-cell ( ), and the step of determining which one of the first and second layers Al wirings is used to form each of the edges that compose the circular power source wiring ( ) according to the designated orientation and the priority wiring directions.