Multi-stage Detailed Placement Algorithm for Large-Scale Mixed-Mode Layout Design

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Quadratic/Analytical placement methods have been widely used in the latest IC design process. This kind of placement needs a powerful detailed placement method for large-scale mixed macro and standard cell placement. An efficient and effective multi- stage iterative detailed placement (MSIP) algorithm is proposed in this paper. It combines a better initial placement based on combinatorial optimization method with a deterministic local search for post optimization. Various strategies are used for saving computation time. Experimental results show that it can get an average of 22% wire length improvement comparing to PAFLO [6] in comparable runtime.