Integrated circuit design method and non-transitory computer readable medium thereof

A non-transitory computer readable medium that comprises a plurality of computer readable commands, wherein the computer readable commands are executed by a processor of a computer system to execute an IC design method, the IC design method comprising:

• retrieving a clock tree structure comprising a plurality of flip-flops and a plurality of clock units from an IC design file;
• using the flip-flops as starting points, determining a branch level number of a branch that each of the clock units in the clock tree structure locates relative to the flip-flops;
• calculating the branch level number of a common branch that closest to each two of the flip-flops as a common branch level number;
• retrieving a scan chain structure of the flip-flops from the IC design file;
• determining a wire distance and a clock skew of each two of the flip-flops according to the scan chain structure;
• calculating a cost of each two of the flip-flops according to the common branch number, the wire distance and the clock skew of each two of the flip-flops;
• determining an initial point and a terminal point of the flip-flops in the scan chain structure according to the scan chain structure to further calculate a path having a minimum cost of the flip-flops from the initial point to the terminal point according to the cost of each two of the flip-flops;
• and
• updating a connection order of the scan chain structure of the IC design file according to the path.