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航空电子系统日益增长的复杂性使其必须走向分布式处理的道路。本文介绍一个基于1553B总线的分布式航空电子系统的实验模型——EPDAS系统,讨论了EPDAS系统信息传输机构的有关组成部分:总线通信协议、通信管理软件和总线接口,本文在分析传统的同步总线控制方式的缺点之后,提出了询问和命令/响应相结合的总线控制方式,该方式能提高总线传输的效率和实时性。在EPDAS系统的总线接口设计中,引入了流水线并行处理技术,解决了总线接口的瓶颈问题,并使之易于VLSI化;伪DMA控制的概念,使总线接口电路更加简化;共享存贮器的互连技术,具有效率高、控制简单、容易实现等优点。EPDAS系统结构合理、效率高,符合国情、适合于新一代的飞机。
The growing complexity of avionics systems has made it necessary to move toward distributed processing. This paper introduces a 1553B bus-based distributed avionics experimental model - EPDAS system, discusses the EPDAS system information transmission mechanism of the relevant components: bus communication protocol, communication management software and bus interface, this article analyzes the traditional synchronous bus After the shortcomings of the control mode, this paper proposes a bus control mode that combines inquiry and command / response, which can improve the efficiency and real-time performance of bus transmission. In the bus interface design of EPDAS system, the pipeline parallel processing technology is introduced to solve the bottleneck problem of the bus interface and make it easy to VLSI; the concept of pseudo-DMA control makes the bus interface circuit more simplified; Even technology, with high efficiency, simple control, easy to implement and so on. EPDAS system structure is reasonable, high efficiency, in line with national conditions, suitable for a new generation of aircraft.