一种新型多点互联高速冗余总线通信方法与实现

Method and Implementation of a Novel Multi-point Interconnect High-Speed Redundant Bus Communication

针对航电设备高可靠与小型化的发展趋势,提出一种新型多点互联高速冗余总线通信方法与实现途径,该总线主站点通过5条公共的通信链路与多达32个从站点进行多点互联通信,5条通信链路中4条通信链路处于工作状态,1条处于热备份状态。通信链路层综合采用曼彻斯特、8B/10B和CRC-16等编解码算法,实现通信链路故障的自动诊断、备份链路的自动切换以及自动重传功能。总线传输峰值带宽可达到400Mbps。与传统航电设备采用的并行总线相比,本串行总线在传输带宽、可靠性、可维护性和小型化等方面具备显著优势。

The method and implementation of a novel multi-point high-speed redundant bus communication are proposed to meet the high-reliability and miniaturization development requirements of avionics.In the bus topology,the master node communicates with up to 32slave nodes via the common five data channels, among which four channels are in work mode,and the rest one is in hot-backup mode.Manchester-Ⅱ encoder algorithm,8B/10B encoder algorithm,and CRC-16 encoder algorithm are combinationally adopted in the bus link layer to achieve auto link channel faulty-diagnose,backup channel work mode auto-switch, and auto-retry transmission functions.The bus peak transmission bandwidth is up to 400Mbps.By comparing with the traditional parallel buses adopted by avionics,the serial bus is more prominent in transmission bandwidth,reliability,maintainability and miniaturization factors.