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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。
In the avionics system, the application and demand of discrete digital circuits are more and more. However, the traditional discrete interface chips have lower integration and higher power consumption, and in harsh environments, discrete stability and reliability Difficult to be guaranteed. Based on the above limitations, a new discrete digital interface converter chip is introduced that converts a 28 V avionics power level to a TTL level due to its high integration, low power consumption, and demonstrated stable performance in harsh environments , So has a wide range of applications. At the same time, the chip read / write operation is different from the traditional “CPU + dedicated chip ” control method, the use of programmable logic devices (FPGA) to achieve the control of the chip, the VHDL language to write control logic , Integrated design with Xilinx integrated development environment, and write test code to simulate. The results show that this method can not only read / write control the chip, but also greatly improve the system’s ability to process data with higher stability and reliability.