开关量I/O对于导弹地面测发控系统完成控制和状态监测任务必不可少。介绍了基于VXI总线的C尺寸32路开关量I/O模件的硬件设计,利用VXI总线标准化、模块化的特点,以CPLD为核心实现了其接口电路,并给出了各部分逻辑控制电路的时序仿真;采用隔离技术实现了电源与通道及通道与通道间的隔离。该模件硬件已调试完毕,结果表明,VXI接口电路符合VXI总线时序规范要求,抗干扰能力较强。

Switch signal I/O is essential for the missile measure emission and control system on ground to control and monitor the missile status. The hardware design of C-size 64-channel switch signal I/O module based on VXI bus is introduced in this paper. The VXI bus's standardization and modularization are make use of, the circuit is realized with a CPLD chip in the core, and timing simulation of logic control circuit is given; the 64 switch I/O channels, even the power, are isolated. The hardware debugging has been finished which shows that it measures up the timing specification of VXI bus and improves the module's ability to restrain disturbance remarkably.