一种基于时间触发光纤通信网络时钟同步设计

为解决传统时间触发光纤通信网络(TTFC网络)的时钟同步拥堵问题,提出了基于改进型串行时间码(IRIG-B码)的TTFC网络时钟同步方案。该方案采用了改进型的IRIG-B码作为时钟同步方式,改进型的B码信号将同步周期和码元脉宽调整为传统B码的1%o,即改进型的B码信号为每毫秒1帧的时间串码,同时采用数据总线与时钟总线相分离的设计模式,避免了TTFC网络中发送端时钟与数据发生冲突的同时增加了对时的精度。为进一步验证方案的有效性,基于可编程逻辑器件(FPGA)逻辑设计搭建环境进行测试验证。最终试验结果表明,该方案能正确的进行数据收发,同时有效地避免了TTFC网络中的时钟与数据发送冲突,提高了系统带宽。

Design of Clock Synchronization Based on Time Triggered OpticalFiber Communication Network

In order to solve the problem of clock synchronization congestion in traditional time trig-gered optical fiber communication network ( hereinafter referred to as TTFC network ),a clock syn-chronization scheme of TTFC network based on improved IRIG-B code is proposed. The improvedIRIG-B code is used as the clock synchronization mode. The improved B code signal adjusts the syn-chronization period and symbol pulse width to one thousandth of that of the traditional B code, that is, the improved B code signal is a time serial code of 1 frame per millisecond, and the design mode of separating the data bus from the clock bus is adopted. It can avoid the conflict between the clock and data in the TTFC network, and increase the accuracy of time synchronization. In order to further verify the effectiveness of the scheme, a test environment based on FPGA logic design is built. Final-ly,the experimental results show that the scheme can send and receive data correctly, effectively a-void the conflict between clock and data transmissionin TTFCnetwork, and improve the system bandwidth.