Based On Fc - Ae - Asm Avionics Test The Design And Implementation Of The Interface

Fiber Channel(FC) network has a number of favorable features, such as highspeed, high reliability, high bandwidth, low time delay, long transfer distance and soon.So it’s the best choice for next generation advanced integrated avionics system. Theprotocol of FC-AE-ASM(Fiber Channel-Avionics Environment-Anonymous SubscriberMessaging) is utilized to support safe and low time delay communication among theCPU, sensors and display monitor of avionics system. An independent research onFC-AE-ASM avionics test system is of significance in building the next generationadvanced integrated avionics system. The FC-AE-ASM simulation and test interfacecard is the basis and essential component of the FC-AE-ASM avionics test system.Based on analyzing the protocol of FC-AE-ASM, the thesis studies the design of thesimulation and test interface card, the establishment and test method of theFC-AE-ASM avionics test system. Finally the thesis makes use of network simulationtool OPNET to establish the model of the system and initially verifies the design of theinterface card and the system. On the basis of studying the cluster of Fiber Channelprotocol and FC-AE-ASM protocol, according to the function and performancerequirement of the interface card, the overall hardware and software design andworkflow is proposed. Based on the hardware platform designed in the paper, thesoftware design and implementation of FC-AE-ASM stack was divided into two parts.One is the firmware running on the CPU of fiber channel SOC, the other is the driverrunning on the CPU of personal computer. The real-time problem of data transferthrough PCI bus between fiber channel SOC and the personal computer is analyzed andthe method of setting a signal flag in dual port RAM to solve the problem is proposed.The thesis gives the detailed design of the FC SOC firmware on VxWorks and the PCdriver on real-time extensible subsystem RTX. The design and workflow of keymodule in the firmware and driver are researched and discussed deeply.Moreover,based on the analysis and summery of classical queue scheduling algorithms, a dataframe scheduling algorithm-PQ+WRR which combines the Priority.Queue algorithm(PQ) and Weighted Round Robin algorithm (WRR) is given in the thesis. This algorithm could not only guarantees that the urgent data frame in the highest priorityqueue could be sent firstly, but also avoids the starvation problem that data frame in thelower priority queue could not be scheduled to send for a long time.The thesis utilizes the designed FC-AE-ASM simulation and test interface card,fiber channel switch, personal computer, fiber channel protocol analyzer and protocolanalyzing software to establish the FC-AE-ASM avionics test system. The performancetest method and criterion of the system network are researched, and the ping-pang testmethod based on the principle of loopback packet delay test is given to test the essentialparameter of the system network.The thesis utilizes the network model simulation tool OPNET to establish thesimulation model of the designed interface card and the FC-AE-ASM test system. Thedesign method of establishing frame model, link model, node model, process model andnetwork model is discussed in details, and the simulation result of the designed interfacecard and FC-AE-ASM test system is given. The result initially demonstrates that thedesign of FC-AE-ASM interface card and test system is feasible.