Static timing analysis for modeling QoS in networks-on-chip

  • Authors:
  • Evgeni Krimer;Isaac Keslassy;Avinoam Kolodny;Isask'har Walter;Mattan Erez

  • Affiliations:
  • Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78712, USA;Department of Electrical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;Department of Electrical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;Department of Electrical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78712, USA

  • Venue:
  • Journal of Parallel and Distributed Computing
  • Year:
  • 2011

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Abstract

Networks-on-chip (NoCs) are used in a growing number of SoCs and multi-core processors. Because messages compete for the NoC's shared resources, quality of service and resource allocation are major concerns for system designers. In particular, a model for the properties of packet delivery through the network is desirable. We present a methodology for packet-level static timing analysis in NoCs. Our methodology quickly and accurately gauges the performance parameters of a virtual-channel wormhole NoC without simulation. The network model can handle any topology, link capacities, and buffer sizes. It provides per-flow delay analysis that is orders-of-magnitude faster than simulation while being significantly more accurate than prior static modeling techniques. Using a carefully derived and reduced Markov chain, the model can statically represent the dynamic network state. Usage of the model in a placement optimization problem is shown as an example application.