Several code-division multiple access (CDMA)-based interconnect schemes have been recently proposed as alternatives to the conventional time-division multiplexing bus in multicore systems-on-chip. CDMA systems with a dynamic assignment of spreading codewords are particularly attractive because of their potential for higher bandwidth efficiency compared with the systems in which the codewords are statically assigned to processing elements. In this paper, we propose a novel distributed arbitration scheme for dynamic CDMA-bus-based systems, which solves the complexity and scalability issues associated with commonly used centralized arbitration schemes. The proposed arbitration unit is decomposed into multiple simple arbitration elements, which are connected in a ring. The arbitration ring implements a token-passing algorithm, which both resolves destination conflicts and assigns the codewords to processing elements. Simulation results show that the throughput reduction in an optimally configured dynamic CDMA bus due to arbitration-related overheads does not exceed 5%.

中文翻译：

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具有动态码字分配的片上CDMA总线分布式仲裁方案

最近提出了几种基于码分多址 (CDMA) 的互连方案，作为多核片上系统中传统时分复用总线的替代方案。具有扩展码字动态分配的CDMA系统特别有吸引力，因为与将码字静态分配给处理元件的系统相比，它们具有更高的带宽效率潜力。在本文中，我们为基于 CDMA 总线的动态系统提出了一种新颖的分布式仲裁方案，它解决了与常用集中式仲裁方案相关的复杂性和可扩展性问题。所提出的仲裁单元被分解为多个简单的仲裁单元，这些单元连接成一个环。仲裁环实现了令牌传递算法，它既解决目的地冲突又将代码字分配给处理元素。仿真结果表明，由于仲裁相关开销，优化配置的动态 CDMA 总线的吞吐量降低不超过 5%。