Seiko Epson Corporation

Kensuke Torii

Yasuhiro Oguchi

Yasuhisa Hirabayashi

Masuo Tsuji

A method of designing a semiconductor integrated circuit makes it possible to reduce the amount of manual routing of a power wire. After a V power wire for a circuit block and a V power wire for the circuit block have been routed, the number and positions of y-direction V power wires are determined from consideration of the positions thereof. A first y-direction V power wire among the y-direction V power wires is used without being in contact with edges of the V power wire for the circuit block, but it overlays the routing position thereof. For that reason, non-selection of that first y-direction V power wire is determined. The other y-direction V power wires are subsequently routed automatically.

Semiconductor integrated circuits and method for designing the same

A method of designing a semiconductor integrated circuit that makes it possible to reduce the manual work during the layout of power wiring. A first encircling power wire for supplying power to circuitry within a first circuit block, such as a memory block, is placed within that block. A second encircling power wire for supplying power to a random logic circuit block is placed to have a complicated shape, in order to avoid crossing the first encircling power wire. Two edges of the second encircling power wire are placed within the first circuit block. These two edges form a bent portion. By using these two edges for a portion that has a complicated shape of the second encircling power wire, it becomes possible to automate the routing of the other four edges of the second encircling power wire.

Semiconductor integrated circuit and method of designing the same

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.

Growing community of inventors

Fujimi-machi, Japan

Kensuke Torii