Pin Limitations and Partitioning of VLSI Interconnection Networks

  • Authors:
  • M. A. Franklin;D. F. Wann;W. J. Thomas

  • Affiliations:
  • Department of Electrical Engineering, Washington University;-;-

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 1982

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Abstract

Multiple processor interconnection networks can be characterized as having N' inputs and N' outputs, each being B' bits wide. A major implementation constraint of large networks in the VLSI environment is the number of pins available on a chip, Np. Construction of large networks requires partitioning of the N' * N' * B' network into a collection of N * N switch modules with each input and output port being B (B = B') bits wide. If each module corresponds to a single chip, then a large network can be implemented by interconnecting the chips in a particular manner. This correspondence presents a methodology for selecting the optimum values of N and B given values of N', B', Np, and the number of control lines per port. Models for both banyan and crossbar networks are developed and arrangements yielding minimum: 1) number of chips, 2) average delay through the network, and 3) product of number of chips and delay, are presented.