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Toggle Equivalence Preserving (TEP) Logic Optimization

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3 Author(s)
Eugene Goldberg ; Cadence Design Systems ; Kanupriya Gulati ; Sunil Khatri

We describe a procedure (called the TEP procedure) that, given a multi-output circuit M, builds another multi-output circuit M* that is toggle equivalent to M. The TEP procedure can be used in the following two scenarios. First, since for single- output circuits toggle equivalence means functional equivalence, the TEP procedure can be used in "regular" logic synthesis. Second, the TEP procedure enables a powerful synthesis method called LS_TE (Logic Synthesis preserving Toggle Equivalence). Given a circuit N and its partitioning into subcircuits Ni LS_TE builds an optimized circuit N* by replacing subcircuits Ni with their toggle equivalent counterparts Ni. The replacement of Ni with N*i is done by the TEP procedure. We give results of optimizing single-output circuits by the TEP procedure and some preliminary results of using the TEP procedure in LS_TE. These results show the promise of the TEP procedure and LS_TE.

Published in:

Digital System Design Architectures, Methods and Tools, 2007. DSD 2007. 10th Euromicro Conference on

Date of Conference:

29-31 Aug. 2007