Research And Implementation Of Link Level Protocol In High-speed Interconnection Network

High performance interconnect network is an important part of high performance computer system (HPC). High bandwidth, low latency, high reliability and scalability are the main factors of high performance interconnect network which directly determine the efficiency, reliability and scalability of HPC. Optical network is the representative of high speed serial transmission techniques. The maturity of such techniques has a profound impact on the study and design of high performance interconnect network. A large amount of improvements and optimizations based on traditional mature approaches are required to meet the developing technical features and demands.In this paper, the basic principal of the high-speed interconnection network protocol is studied, such as the sliding-window protocol and flow-control policy. And three main innovations are proposed, including: a new shift-register based retransmission overtime management mechanism, an ACK and credit transmission management mechanism with special micro-packet in link layer and a credit flow-control strategy base on sliding-window.With consideration in the implementation, some key techniques, such as the condition of credit overtime, are also discussed. Based on these new protocol and new mechanism, an optimized link level protocol based on current project is coded with Verilog HDL and its function is simulated through FPGA.Theoretical analysis and experiment results show that the new mechanisms and innovations effectively reduce the resource consumption of retransmission protocol and separate the network level logic from link level logic. So it optimizes the implementation efficiency and architecture of high speed interconnection protocol.