Wiring area optimization in floorplan-aware hierarchical power grids

In this paper, the floorplan-aware topology of hierarchical power quad-grids is proposed to dynamically meet the local requirement of high current densities inside the floorplan and an iterative linear voltage/current scaling (ILVCS) approach is proposed to meet the current electromigration and voltage IR-drop constraints phase by phase. The experimental results show that our proposed ILVCS approach based on hierarchical power quad-grids can obtain 23%/spl sim/44% improvement on total wiring area than the power grids by the wire sizing method for the tested examples.