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A rigorous framework for convergent net weighting schemes in timing-driven placement

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3 Author(s)
Chan, T.F. ; Comput. Sci. Dept, Univ. of California, Los Angeles, Los Angeles, CA, USA ; Cong, J. ; Radke, E.

We present a rigorous framework that defines a class of net weighting schemes in which unconstrained minimization is successively performed on a weighted objective. We show that, provided certain goals are met in the unconstrained minimization, these net weighting schemes are guaranteed to converge to the optimal solution of the original timing-constrained placement problem. These are the first results that provide conditions under which a net weighting scheme will converge to a timing optimal placement. We then identify several weighting schemes that satisfy the given convergence properties and implement them, with promising results: a modification of the weighting scheme given in results in consistently improved delay over the original, 4% on average, without increase in computation time.

Published in:

Computer-Aided Design - Digest of Technical Papers, 2009. ICCAD 2009. IEEE/ACM International Conference on

Date of Conference:

2-5 Nov. 2009

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