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Virtual Symmetry Axes for the Layout of Analog IC's
Malavasi, Enrico,Charbon, Edoardo,Jusuf, Gani,Totaro, Roberto,Vincentelli, Alberto Sangiovanni 대한전자공학회 1991 ICVC : International Conference on VLSI and CAD Vol.2 No.1
A new approach to the layout of integrated circuits with multiple symmetry axes is presented in this paper. When more than one symmetry is present, the usual approach to placement grad compaction makes extensive ruse of hierarchy, which requires firmed positions for symmetry ayes. As a result, wiring and area optimizations rare poor. The position of a virtual symmetry axis is variable, and dynamically defined by the center of a group of symmetric modules and wires called cluster. Virtual symmetry axes have been implemented in a placement tool using the Simulated Annealing algorithm and in a compaction tool based on the constraint-graph longest-path algorithm. Results are shown proving the suitability of this approach.