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Post-Floorplanning Power/Ground Ring Synthesis for Multiple-Supply-Voltage Designs



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Post Floorplanning Power Ground Ring Synthesis for Multiple Supply Voltage Designs Wan Ping Lee Diana Marculescu Yao Wen Chang Graduate Institute of Electronics Engineering National Taiwan University Taipei 10617 Taiwan Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213 Department of Electrical Engineering National Taiwan University Taipei 10617 Taiwan planet eda ee ntu edu tw dianam ece cmu edu ABSTRACT The multiple supply voltage MSV design style has been extensively applied to mitigate dynamic power consumption The MSV design paradigm however brings many crucial challenges especially in the power ring synthesis Unlike the previous works that form the power rings as the enclosing bounding boxes of voltage islands we enable power rings alignment to the outer boundaries of voltage islands With this new formulation the power ring estimation becomes more accurate during floorplanning and the power ring synthesis is more practical after floorplanning In this paper we first propose a linear time voltage island power ring search algorithm to identify the power rings of voltage islands and then present a linear time optimal power ring corner patching algorithm to minimize the number of corners in the power rings by using post floorplanning whitespaces Experimental results first demonstrate that reducing corners in power rings significantly mitigates IR drop and then show that the proposed algorithm can reduce the number of corners by 33 on average for the GSRC floorplan benchmarks In particular the total running time for the 16 GSRC benchmarks is less than one second on an AMD 64 machine with a 2 2 GHz CPU and 8 GB memory Categories and Subject Descriptors B 7 2 Integrated Circuits Design Aids General Terms Algorithms Design Performance Keywords VLSI Physical Design Floorplanning Multiple Supply Voltage Design 1 INTRODUCTION Performance constrained low power design has been studied extensively in the literature Among existing techniques the



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