Low power consumption designing method of semiconductor integrated circuit

Abstract

In a standard cell synthesizing step, a net list is synthesized from an RTL description, and an instance name list is formed which contrasts a register description portion with an instance name contained in the net list; in a simulation step, an operation simulation written by the RTL description is carried out; the toggle information among registers which is extracted in the simulation stepis recorded in a toggle storing step, a flip-flop-to-flip-flop toggle information database is constructed in which the recorded toggle information corresponds to a flip-flop-to-flip-flop instance name obtained from the instance name list in a mapping step; and in an electric power optimizing step, a physical designing operation for reducing power consumption is optimized by employing the net list, the flip-flop-to-flip-flop toggle information database, and a timing restriction.