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Voltage and Level-Shifter Assignment Driven Floorplanning

Bei YU, Sheqin DONG, Song CHEN, Satoshi GOTO

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Summary :

Low Power Design has become a significant requirement when the CMOS technology entered the nanometer era. Multiple-Supply Voltage (MSV) is a popular and effective method for both dynamic and static power reduction while maintaining performance. Level shifters may cause area and Interconnect Length Overhead (ILO), and should be considered at both floorplanning and post-floorplanning stages. In this paper, we propose a two phases algorithm framework, called VLSAF, to solve voltage and level shifter assignment problem. At floorplanning phase, we use a convex cost network flow algorithm to assign voltage and a minimum cost flow algorithm to handle level-shifter assignment. At post-floorplanning phase, a heuristic method is adopted to redistribute white spaces and calculate the positions and shapes of level shifters. The experimental results show VLSAF is effective.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.12 pp.2990-2997
Publication Date
2009/12/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.2990
Type of Manuscript
Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category
Physical Level Desing

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