TRADE-OFF CONSIDERATIONS IN DESIGNING EFFICIENT VLSI FEASIBLE INTERCONNECTION NETWORKS

It is well known that the hypercube has a rich set of good properties, and consequently it has been recognized an ideal structure for parall el computation. Nevertheless, according to the current VLSI technology , the implementation feasibility of the hypercube remains questionable when the size of the hypercube becomes large. Recent research efforts have been concentrated on finding good alternatives to the hypercube. The star graph was shown having many desirable properties of the hype rcube, and in several aspects, the star graph is better than the hyper cube. However, we observe that the star graph as a network has several disadvantages, compared with the hypercube. In this paper, we propose a class of new networks, the star-hypercube hybrid networks (or the S H networks). The SH network is a simple combination of both the star g raph and the hypercube. This class of networks contains the star graph and the hypercube as subclasses. We show that the SH network is an ef ficient and versatile network for parallel computation, since it share s properties of both the hypercube and the star graph, and remedies se veral major disadvantages of the hypercube and the star graph. This cl ass of networks provide more flexibility in choosing the size, degree, number of vertices, degree of fault tolerance, etc. in designing mass ively parallel computing structures feasible for VLSI implementations.