MIL-1394B bus is widely used in avionics system at home and abroad,but it adopts physical connecting mode of chrysanthemum chain,whose reset fault of a single node will lead to the reset diffusion of the whole network and the communication abnormality of whole network. Since the fault of MIL - 1394B bus is difficult to isolate in integrated avionics device,a fault isolation method using prior information is proposed. The principle of reset fault is analyzed,and then the prior information of node number in avionics system is pre-assigned in combination with MIL-1394B bus to acquire and analyze SELF- ID packet of AS643 bus,and establish the mechanism of link credit value. A method of detecting credit value is designed,and the hardware design of node is reformed to close the error link while the credit value is lower than the threshold,which can realize the fault detection and isolation of MIL-1394B network. The designed method and mechanism were verified by a physical system,and can be used in highly-integrated avionics system.
Modern Electronic Technique