A Hybrid Evolution Algorithm for VLSI Floorplanning

The floorplanning is a critical phase in very large-scale integrated-circuit(VLSI) phsical design. It determines the topology of layout, and it aims to arrange a set of rectangular modules on a chip so as to optimize the chip area, wirelength, etc. This problem is known to be NP-hard, and has received much attention in recent years. B*-tree representation is adopted in this paper. Based on the concept of evolutionary algorithm and simulated annealing, a hybrid evolutionary algorithm(ESA) is proposed. It is effective to explore solution space and locate the optimalsolution.The effectivenessof our method is demonstrated on several cases of MCNC benchmarks.