Timing driven floorplanning on programmable hierarchical targets

  • Authors:
  • S. A. Senouci;A. Amoura;H. Krupnova;G. Saucier

  • Affiliations:
  • Institut National Polytechnique de Grenoble/CSI, 46. Avenue Felix Viallet 38031 Grenoble cedex, France;Institut National Polytechnique de Grenoble/CSI, 46. Avenue Felix Viallet 38031 Grenoble cedex, France;Institut National Polytechnique de Grenoble/CSI, 46. Avenue Felix Viallet 38031 Grenoble cedex, France;Institut National Polytechnique de Grenoble/CSI, 46. Avenue Felix Viallet 38031 Grenoble cedex, France

  • Venue:
  • FPGA '98 Proceedings of the 1998 ACM/SIGDA sixth international symposium on Field programmable gate arrays
  • Year:
  • 1998

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Abstract

The goal of this paper is to perform a timing optimization of a circuit described b y a network of cells on a target structure whose connection delays ha v ediscrete values follo wing its hierarch y. The circuits is modelled by a set of timed cones whose delay histograms allow their classification into critical, potential critical and neutral cones according to predicted delays. The floorplanning is then guided b y this cone structuring and has two innov ativ e features:first, it is shown that the placement of the elements of the neutral cones has no impact on timing results, th us a significant reduction is obtained; second, despite a greedy approach, a near optimal floorplan is achieved in a large number of examples.