HEPAPS: A PCB automatic placement system HEPAPS is composed of constructive placement, improving placement, equivalence pins reassignment and same function elements reassignment. Based on practical demands, this paper implements the constructive procedure within a set of engineering constraints and resolves the reassignment problems of equivalence and same function elements. A new topological improving method combined min-cut algorithm with simulated annealing algorithm is presented. In addition, the two-dimensional relaxed method is introduced to solve the geometrical optimization problem.
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