Gated clock design supporting method, gated clock design supporting apparatus, and computer readable memory storing gated clock design supporting program

A gated clock design supporting apparatus comprising:

• a circuit information input portion for inputting information about a logic circuit not clock-gated, information about enable logic for controlling a clock output and information about a gating circuit;
• an enable logic timing constraint generating portion for generating a timing constraint to be secured for said enable logic;
• an enable logic timing determination portion for calculating a delay time in said enable logic and determining whether or not said enable logic satisfies said timing constraint based on said delay time;
• a clock gating execution portion for, when said enable logic satisfies said timing constraint, adding said gating circuit and a circuit composed of said enable logic to said logic circuit not clock-gated so as to generate a clock-gated logic circuit;
• and
• a circuit information output portion for outputting information about said clock-gated logic circuit and said timing constraint to be secured for said enable logic.

A computer-readable memory storing gated clock design supporting program, said gated clock design supporting program comprising the steps of:

• inputting information about a logic circuit not clock-gated, information about enable logic for controlling a clock output and information about a gating circuit;
• generating a timing constraint to be secured for said enable logic;
• calculating a delay time in said enable logic;
• determining whether or not said enable logic satisfies said timing constraint based on said delay time;
• when said enable logic satisfies said timing constraint, adding said gating circuit and a circuit composed of said enable logic to said logic circuit not clock-gated so as to generate a clock-gated logic circuit;
• and
• outputting information about said clock-gated logic circuit and said timing constraint to be secured for said enable logic.