一种面向多核处理器2 GHz片上网络通信单元.doc

一种面向多核处理器2 GHz片上网络通信单元 　　摘要：提出了一种面向多核微处理器的2 GHz片上网络通信单元设计方案，通信单元能够在45 nm工艺下达到2 GHz的工作频率，流水线级数为2，最多支持8个双向通信接口，每个端口单向峰值带宽32 GBps.构建了一种16核处理器片上网络测试环境，测试结果表明：使用提出的通信单元构建的片上网络能够满足16核处理器存储系统对网络带宽的要求，在对访存优化的情况下，聚合带宽能够随着处理器核心与线程的增加而线性增加.另外，通信单元还具有可重用的特性，能够通过优化与扩展进一步应用于众核处理器片上网络.研究成果已成功应用于某国产16核高性能微处理器，片上网络实测频率达到2 GHz. 关键词：多核处理器；片上网络；通信单元 中图分类号：TP332 文献标识码：A A 2 GHz Network-on-chip Communication Unit for Multi-core Microprocessors ZHOU Hong-wei1， ZHANG Li-xia2， DOU Qiang1， LI Yong-jin1， YAN Xiao-bo1， ZHANG Ying1 （1.College of Computer， National Univ of Defense Technology， Changsha， Hunan 410073， China； 2. College of Information Science and Engineering， Central South Univ， Changsha， Hunan 410083， China） Abstract： A 2 GHz network-on-chip communication unit for multi-core microprocessors was proposed. A 2 GHz frequency in 45nm process technology can be reached and the pipeline stage is 2. There are eight bi-direction communication ports totally and the peak bandwidth is 32 GBps in each port. A test environment for network-on-chip which supports 16 high-performance processor cores was built. The test results show that network-on-chip constructed by the proposed communication unit can meet the requirements of network bandwidth by 16-core processor storage system. In the case that memory access is optimized， the aggregate bandwidth can be increased linearly with the number of the processor and thread increase. In addition， the communication unit has reusable features and can continue to be used for network-on-chip in many-core processor when it will be optimized and expanded in future. The idea of this paper has been used successfully in one of self-designed 16-core high performance microprocessors. The frequency of network-on-chip logic has been reached to 2 GHz. Key words： multi-core processor； network-on-chip； communication unit 目前主流的多核处理器一般集成4～16个处理器核心，采用片上多处理器（Chip Multiprocessors，CMP）体系结构.多核处理器通常以总线、环和交叉开关作为片上互连网络拓扑结构，当核数较少时，处理器内部数据通信的要求基本能够得到满足