Abstract
With increasing application complexity and improvements in process technology, Chip MultiProcessors (CMPs) with tens to hundreds of cores on a chip are becoming a reality. Networks-on-Chip (NoCs) have emerged as scalable communication fabrics that can support high bandwidths for these massively parallel multicore systems. However, traditional electrical NoC implementations still need to overcome the challenges of high data transfer latencies and large power consumption. On-chip photonic interconnects with high performance-per-watt characteristics have recently been proposed as an alternative to address these challenges for intra-chip communication. In this article, we explore using low-cost photonic interconnects on a chip to enhance traditional electrical NoCs. Our proposed hybrid photonic ring-mesh NoC (METEOR) utilizes a configurable photonic ring waveguide coupled to a traditional 2D electrical mesh NoC. Experimental results indicate a strong motivation to consider the proposed architecture for future CMPs, as it can provide about 5× reduction in power consumption and improved throughput and access latencies, compared to traditional electrical 2D mesh and torus NoC architectures. Compared to other previously proposed hybrid photonic NoC fabrics such as the hybrid photonic torus, Corona, and Firefly, our proposed fabric is also shown to have lower photonic area overhead, power consumption, and energy-delay product, while maintaining competitive throughput and latency.
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Index Terms
METEOR: Hybrid photonic ring-mesh network-on-chip for multicore architectures
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