Abstract:

The growing complexity of avionics systems has led it to distributed processing. This paper introduces an 1553B based on Experimental Prototype of Distributed Avionics System（EPDAS） , and discusses its related components of the information transfer mechanism, such as the protocol of the bus communication, the communication program and the Bus Interface Unit（BIU） .After having analyzed the shortcoming of the conventional Synchronous Bus Control strategy, this paper presents a bus control strategy of PCCR （Polling Combined with Command/Respones） , which can raise the efficiency of bus data transfer.The adoption of pipeline processing in the BIU design for the EPDAS system makes the BIU not only faster but also simplified so as to be suitable for VLSI implementation.The concept of Pseudo-DMA Control, proposed in the paper, further simplifies the hardware of the BIU. The efficient interconnection via shared memory between the BIU and its host computer is easy to control and implement.

Key words: avionics, 1553 bus, communication, bus interface, pipeline