This paper describes HighwayNoC, a Network-on-chip (NoC) that approaches ideal network performance using a Dual Data Rate (DDR) datapath. Based on the observation that routers datapath is faster than control, a DDR NoC allows flits to be routed at DDR improving throughput to rates defined solely by the datapath, rather than by the control. DDR NoCs can use pipeline bypassing to reduce packet latency at low traffic load. However, existing DDR routers offer bypassing only on in-network, non-turning hops to simplify the required logic. HighwayNoC extends bypassing support of DDR routers to local ports, allowing flits to enter and exit the network faster. Moreover, it simplifies the DDR switch allocation and the interface of router ports reducing power and area costs. Post place and route results in 28 nm technology show that HighwayNoC performs better than current state of the art NoCs. Compared to previous DDR NoCs, HighwayNoC reduces average packet latency by 7.3-27% and power consumption by 1-10%, without affecting throughput. Compared to existing Single Data Rate NoCs, HighwayNoC achieves 17-22% higher throughput, has similar or up to 13.8% lower packet latency, and mixed energy efficiency results.

中文翻译：

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HighwayNoC：双数据速率路由器接近理想的NoC性能

本文介绍了HighwayNoC，它是一种使用双数据速率（DDR）数据路径接近理想网络性能的片上网络（NoC）。基于观察到路由器的数据路径比控制更快的速度，DDR NoC允许以DDR方式路由数据块，从而将吞吐量提高到仅由数据路径而非控制定义的速率。DDR NoC可以使用流水线旁路来减少低流量负载下的数据包延迟。但是，现有的DDR路由器仅在网络内非循环跳中提供旁路，以简化所需的逻辑。HighwayNoC将对DDR路由器的旁路支持扩展到本地端口，从而使分支可以更快地进入和退出网络。此外，它简化了DDR交换机的分配和路由器端口的接口，从而降低了功耗和面积成本。28 nm技术中的后置和路线结果表明，HighwayNoC的性能优于当前最新的NoC。与以前的DDR NoC相比，HighwayNoC可以将平均数据包延迟减少7.3-27％，将功耗降低1-10％，而不会影响吞吐量。与现有的单数据速率NoC相比，HighwayNoC的吞吐量提高了17-22％，数据包延迟降低了类似或高达13.8％，并且混合了能源效率。