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With the trend towards increasing number of cores in a multicore processors, the on-chip network that connects the cores needs to scale efficiently. In this work, we propose the use of high-radix networks in on-chip networks and describe how the flattened butterfly topology can be mapped to on-chip networks. By using high-radix routers to reduce the diameter of the network, the flattened butterfly offers lower latency and energy consumption than conventional on-chip topologies. In addition, by properly using bypass channels in the flattened butterfly network, non-minimal routing can be employed without increasing latency or the energy consumption.
on-chip networks, topology, flattened butterfly, high-radix routers

J. Kim, W. J. Dally and J. Balfour, "Flattened Butterfly Topology for On-Chip Networks," in IEEE Computer Architecture Letters, vol. 6, no. , pp. 37-40, 2007.
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