基于FPGA的离散量接口控制器设计

Design for discrete magnitude interface controller based on FPGA

在航空电子系统中,离散量数字电路的应用和需求越来越多,而传统的离散量接口芯片集成度较低,功耗较高,且在恶劣环境下,离散量的稳定性和可靠性很难得到保证。基于上述局限,介绍一种新型离散量数字接口转换芯片,能够将28 V航空电源电平转换为TTL电平,由于其高集成、低功耗,并且能够在恶劣环境下展示出较稳定的性能,因此具有广泛的应用前景。同时,对该芯片的读/写操作提出一种不同于传统的"CPU+专用芯片"的控制方法,采用可编程逻辑器件(FPGA)来实现对该芯片的控制,以VHDL语言编写控制逻辑,用Xilinx集成开发环境对设计进行了综合,并编写测试码从而进行仿真。结果表明,该方法不但能够对该芯片进行读/写控制,还能极大程度提高系统处理数据的能力,并具有更高的稳定性和可靠性。

The application and requirement of discrete magnitude digital circuits are increased extremely in the avionics sys?tems,but the traditional discrete magnitude interface chips have low integration and high power dissipation,and the stabilityand reliability of discrete magnitude couldn’t be guaranteed.According to the above situations,a new discrete magnitude inter?face convention chip is introduced,which can convert the28V aircraft power supply level into TTL level.It has wide applica?tion prospect because of its high integration,low power dissipation,and stable performance in severe environment.A controlmethod different from the traditional“CPU+dedicated chip”methods is proposed,in which the field programmable gate array(FPGA)is used to control the discrete magnitude interface chip,the VHDL is adopted to compile the control logic,the Xilinxintegrated development environment is employed to synthesize the design,and the test code is compiled for simulation.The simu?lation results show that the method can perform the read?write control of the chip,improve the data processing ability of the sys?tem,and has high stability and reliability.