基于VXI总线的开关量I/O模件设计

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。

Design of Switch Signal I/O Module Based on VXI Bus

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.