In this paper, we propose a technique for lowering the latency of the communication in a NoC (network on chip). The technique, which can support two qualities of service (QoS), i.e., the guaranteed throughput (GT) and...In this paper, we propose a technique for lowering the latency of the communication in a NoC (network on chip). The technique, which can support two qualities of service (QoS), i.e., the guaranteed throughput (GT) and best effort (BE), is based on splitting a wider link into narrower links to increase throughput and decrease latency in the NoC. In addition, to ease the syn-chronization and reduce the crosstalk, we use the 1-of-4 encoding for the smaller buses. The use of the encoding in the proposed NoC architecture considerably lowers the latency for both BE and GT packets. In addition, the bandwidth is increased while the power consumption of the links is reduced.展开更多
采用模块化方法对集中式仲裁共享总线和二维网格片上网络(Network on Chip,NoC)的硬件开销和延迟进行了数学上的分析。在此基础上,通过可综合Verilog代码对这两种片上通信结构在RTL级进行描述,并建立了这两种通信方式的周期准确级的功...采用模块化方法对集中式仲裁共享总线和二维网格片上网络(Network on Chip,NoC)的硬件开销和延迟进行了数学上的分析。在此基础上,通过可综合Verilog代码对这两种片上通信结构在RTL级进行描述,并建立了这两种通信方式的周期准确级的功能验证和性能分析环境。结果表明,在同样工艺条件下,共享总线的面积与NoC相比相当小;但对于大规模片上系统通信,NoC的吞吐效率及带宽明显优于共享总线。展开更多
该文针对片上网络提出一种基于提前分配路径的低时延片上路由器结构(PAPR)。新路由器采用提前路由计算和提前分配路径来缩短路由器流水线深度。提前路由计算为虚信道提前分配提供了可靠保障,即使在虚信道路径提前分配失败的情况下,也不...该文针对片上网络提出一种基于提前分配路径的低时延片上路由器结构(PAPR)。新路由器采用提前路由计算和提前分配路径来缩短路由器流水线深度。提前路由计算为虚信道提前分配提供了可靠保障,即使在虚信道路径提前分配失败的情况下,也不影响分组在网络中的传输时延。该文提出基于缓存状态的仲裁算法BSTS(BufferStatus)综合考虑当前节点缓存信息和下游节点缓存信息,不但降低了分组等待时延,而且降低了缓存空闲的概率。仿真结果表明,新路由器能明显改善网络的时延和吞吐性能,相比采用滑动迭代轮询仲裁iSLIP(iterativeRound-Robin Matching with SLIP(Serial Line Interface Protocal))算法的经典虚信道路由器,网络平均端到端时延降低了24.5%,吞吐率提高了27.5%;与采用轮询迭代RRM(Round-Robin Matching)算法的经典虚信道路由器相比,平均端到端时延降低了39.2%,吞吐率提高了47.2%。路由器硬件开销和平均功耗分别增加仅为8.9%,5.9%。展开更多
基金Project supported by the Iranian National Science Foundation
文摘In this paper, we propose a technique for lowering the latency of the communication in a NoC (network on chip). The technique, which can support two qualities of service (QoS), i.e., the guaranteed throughput (GT) and best effort (BE), is based on splitting a wider link into narrower links to increase throughput and decrease latency in the NoC. In addition, to ease the syn-chronization and reduce the crosstalk, we use the 1-of-4 encoding for the smaller buses. The use of the encoding in the proposed NoC architecture considerably lowers the latency for both BE and GT packets. In addition, the bandwidth is increased while the power consumption of the links is reduced.
文摘采用模块化方法对集中式仲裁共享总线和二维网格片上网络(Network on Chip,NoC)的硬件开销和延迟进行了数学上的分析。在此基础上,通过可综合Verilog代码对这两种片上通信结构在RTL级进行描述,并建立了这两种通信方式的周期准确级的功能验证和性能分析环境。结果表明,在同样工艺条件下,共享总线的面积与NoC相比相当小;但对于大规模片上系统通信,NoC的吞吐效率及带宽明显优于共享总线。
文摘该文针对片上网络提出一种基于提前分配路径的低时延片上路由器结构(PAPR)。新路由器采用提前路由计算和提前分配路径来缩短路由器流水线深度。提前路由计算为虚信道提前分配提供了可靠保障,即使在虚信道路径提前分配失败的情况下,也不影响分组在网络中的传输时延。该文提出基于缓存状态的仲裁算法BSTS(BufferStatus)综合考虑当前节点缓存信息和下游节点缓存信息,不但降低了分组等待时延,而且降低了缓存空闲的概率。仿真结果表明,新路由器能明显改善网络的时延和吞吐性能,相比采用滑动迭代轮询仲裁iSLIP(iterativeRound-Robin Matching with SLIP(Serial Line Interface Protocal))算法的经典虚信道路由器,网络平均端到端时延降低了24.5%,吞吐率提高了27.5%;与采用轮询迭代RRM(Round-Robin Matching)算法的经典虚信道路由器相比,平均端到端时延降低了39.2%,吞吐率提高了47.2%。路由器硬件开销和平均功耗分别增加仅为8.9%,5.9%。
