基于机载1394B总线采集系统的SIPI仿真激励研究

Research on the excitation in SIPI simulation of airborne bus 1394B acquisition module

摘要:

为解决1394B总线信号完整性与电源完整性仿真中的激励问题，探究机载总线测试设备工作中的最坏工作环境，围绕最坏情况激励进行了研究。基于同步开关噪声原理，通过将不同占空比选通波产生的激励导入三种机载1394B总线采集模块的仿真环境中，研究不同选通波占空比对系统输出眼图的影响。在原有总线采集模块仿真环境中，1/2占空比的选通波产生的结果激励相比于3/4占空比的情况，输出眼图的眼高减少85mV，眼宽减少3.56ps。在不同电源网络传输性能和信号网络传输性能下，1/2占空比选通波产生的激励都为最坏情况激励。研究成果可为国产化高速总线采集板卡的集成设计提供借鉴，并为总线采集过程中的故障排除提供思路。

Abstract:

In order to solve the problem of excitation in the simulation of signal integrity and power integrity, exploring the worst working environment of airborne bus acquisition module, this paper focuses on the worst-case excitation producing. Based on the principle of synchronous switching noise, combining the square wave excitation with the pseudo-random binary sequence, the worst-case excitation is generated. In this paper, by introducing the excitation generated by different duty cycle gating wave into three kinds of simulation environments based on airborne bus 1394B acquisition module, the influence of different duty cycle gating wave on the output eye diagram of the system is studied. In the original airborne bus acquisition module simulation environment, the output eye height and eye width of 1/2 duty cycle strobe wave are reduced by 85mv and 3.56ps, compared with that of 3/4 duty cycle gating wave. In different power network transmission performance and signal network transmission performance, the excitation of 1/2 duty cycle gating wave is the worst-case excitation. The concept of this paper provides suggestion for the integration design of the localization high-speed bus acquisition module, and gives a idea for acquisition module debugging.