Constructive Analysis of Cyclic Circuits

  • Authors:
  • Thomas R. Shiple;Gerard Berry;Herve Touati

  • Affiliations:
  • Department of EECS, University of California, Berkeley;Ecole des Mines, Sophia-Antipolis;Digital Equipment Corporation, Paris

  • Venue:
  • EDTC '96 Proceedings of the 1996 European conference on Design and Test
  • Year:
  • 1996

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Abstract

Traditionally, circuits with combinational loops are found only in asynchronous designs. However, combinational loops can also be useful for synchronous circuit design. Combinational loops can arise from high-level language behavioral compiling, and can be used to reduce circuit size. We provide a symbolic algorithm that detects if a sequential circuit with combinational loops exhibits standard synchronous behavior, and if so, produces an equivalent circuit without combinational loops. We present applications to hardware and software synthesis from the Esterel synchronous programming language.