NDLI: Postplacement rewiring by exhaustive search for functional symmetries

Content Provider	ACM Digital Library
Author	Markov, Igor L. Bertacco, Valeria Chang, Kai-Hui
Copyright Year	2008
Abstract	We propose two new algorithms for rewiring: a postplacement optimization that reconnects pins of a given netlist without changing the logic function and gate locations. In the first algorithm, we extract small subcircuits consisting of several gates from the design and reconnect pins according to the symmetries of the subcircuits. To enhance the power of symmetry detection, we also propose a graph-based symmetry detector that can identify permutational and phase-shift symmetries on multiple input and output wires, as well as hybrid symmetries, creating abundant opportunities for rewiring. Our second algorithm, called long-range rewiring, is based on reconnecting equivalent pins and can augment the first approach for further optimization. We apply our techniques for wirelength optimization and observe that they provide wirelength reduction comparable to that achieved by detailed placement.
Starting Page	1
Ending Page	21
Page Count	21
File Format	PDF
ISSN	10844309
e-ISSN	15577309
DOI	10.1145/1255456.1255469
Volume Number	12
Issue Number	3
Journal	ACM Transactions on Design Automation of Electronic Systems (TODAES)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-05-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	VLSI Placement Rewiring
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Computer Science Applications Electrical and Electronic Engineering

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