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Fast and exact simultaneous gate and wire sizing by Lagrangian relaxation

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3 Author(s)
Chung-Ping Chen ; Dept. of Comput. Sci., Texas Univ., Austin, TX, USA ; Chu, C.C.N. ; Wong, D.F.

This paper considers simultaneous gate and wire sizing for general very large scale integrated (VLSI) circuits under the Elmore delay model. We present a fast and exact algorithm which can minimize total area subject to maximum delay bound. The algorithm can be easily modified to give exact algorithms for optimizing several other objectives (e.g., minimizing maximum delay or minimizing total area subject to arrival time specifications at all inputs and outputs). No previous algorithm for simultaneous gate and wire sizing can guarantee exact solutions for general circuits. Our algorithm is an iterative one with a guarantee on convergence to global optimal solutions. It is based on Lagrangian relaxation and “one-gate/wire-at-a-time” greedy optimizations, and is extremely economical and fast. For example, we can optimize a circuit with 27648 gates and wires in 11.53 min using under 23 Mbytes memory on a PC with a 333-MHz Pentium II processor

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:18 ,  Issue: 7 )

Date of Publication:

Jul 1999

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