Low-latency virtual-channel routers for on-chip networks

Abstract

The on-chip communication requirements of many systems are best served through the deployment of a regular chip-wide network. This paper presents the design of a low-latency on-chip network router for such applications. We remove control overheads (routing and arbitration logic) from the critical path in order to minimise cycle-time and latency. Simulations illustrate that dramatic cycle time improvements are possible without compromising router efficiency. Furthermore, these reductions permit flits to be routed in a single cycle, maximising the effectiveness of the router's limited buffering resources.