在面向特定应用的片上系统中,不同模块之间的通信量和延迟需求差异很大,均等位宽的链路不能充分利用带宽资源.为此,提出一种非均匀的带宽分配方案,根据流量特征和竞争状况设定各链路的数据宽度,采用异构的互联结构合理分配连线资源并优化吞吐量.实验结果表明,在均匀流量模式下,非均匀位宽的异构网络和同构架构的吞吐量相近,而连线资源节省16％.在热点流量模式下,异构网络能够有效缓解局部拥塞状况,提高网络吞吐量.%In application-specific systems on chip, traffic load between different modules is unbalanced and the delay requirements vary largely, thus bandwidth cannot be fully used in uniform links. This paper presents a non-uniform bandwidth allocation approach, which assigns different width of data wires to each link according to traffic patterns and contention probability. The proposed method employs a heterogeneous architecture to allocate wire resources and optimize throughput. Experimental results demonstrate that under uniform traffic pattern, the optimized heterogeneous network achieves 16% wire savings with similar throughput compared with a regular Network-on-Chip(NoC). Under hotspot traffic pattern, it effectively alleviates local congestion and improves system throughput.
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