Abstract
Optical network-on-chip (ONoC) is a promising alternative to be served as the fundamental architecture
for future many-core system. However, several problems of ONoC, such as power consumption, arbitration overhead, and
device cost, pose many limitations to the architecture design. In this paper, a novel hierarchical ONoC structure
named CWNoC is proposed, which is a 256-core architecture composed of multiple central-controlled subnets. It reduces
the network complexity by dividing the whole network into several subnets and lowers the arbitration overhead by
adopting centralized arbitration logic in each subnet. An efficient wavelength assignment method, making full use of
broadband mcroring resonators, is also employed in CWNoC, which facilitates simplifying the optical layer and reducing
the possibility of contention. The simulation results show that CWNoC has a better latency and power consumption
performance. For example, when low and medium load is applied, the latency reduction can be as much as 40 ns
compared with WANoC, while the total power consumption is reduced by 70%.
© 2013 IEEE
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