Study And Realization Of Some Key Technologies On AFDX Switch

Because of the solid network foundation and the long-term accumulation of the Ethernet research experience, nowadays, Ethernet has become the most popular networking protocol used in LANs. For the special demand of industrial controller system, such as on site environment, topology and reliability, we must make some adjustment and supplement on the standard IEEE802.3 Ethernet protocol to ensure its reliability when used in the applications of industrial field, that is the often saying called industrial Ethernet. Nowadays, in the field of communicating controller network, the solutions of industrial Ethernet have been widely recognized and accepted. However, it is undeniable that when referring to the lowest level of fieldwork controlling systems, this industrial Ethernet technology encounters some blank walls: the problems of real-time and deterministic.As a new generation of aircraft data network (ADN) standards, ARINC664 defines an avionics-oriented scheme to apply real-time Ethernet with deterministic Quality of Service guarantee. This solution has passed Airline Electronic Engineering Commission's deliberation and has a prospective development future and great application space. Both Boeing and Airbus have explored the commercial Ethernet technology to put it into use and have already developed mature products. For the western countries'restriction on high-tech products to China, our country has not yet proposed a mature ADN solution plan at present. As the startup of the"large aircraft"project, the development of China's aviation industry steps into a flourishing period, in which to design a new generation ADN equipment with China's own intellectual property right is a surefooted and urgent task.With reference to the research project"Design of the Avionics Full-Duplex Switched Ethernet (AFDX) Switch", which our laboratory is in charge of, that is to design and realize an AFDX switch and switching core chip in accordance with the definition of part 7 of ARINC664 standards called"Aircraft Data Network Part7 Avionics Full Duplex Switched Ethernet(AFDX) Network". The AFDX switch should has the ability to support sixteen 100Mbps Ethernet physical ports to realize a full-duplex and non-blocking packets switching. In this dissertation, four parts on the switching core are studied, including memory and queue management module, switching data bus module, capture port module and the simulation and performance analysis of the whole AFDX network. The memory and queue management module presents a method to manage the physical memory as some queue lists for a packet switch. A realization scheme of this method based on FPGA is also given. The simulation and hardware circuit test results show that the realization scheme is feasible and easy to use. The switching data bus module connects the input buffers, output buffers of each port and the memory outside FPGA together for frames to transfer through. It can support bidirectional and multicast transmission under the control of a scheduler. The capture module design and realize a programmable capture port that can supervise traffic through any input port, output port and Virtual Link except itself. The capture function is implemented by adding extra data path(s) from the captured port(s) to the dedicated capture port. The whole AFDX network simulation and performance analysis part constructed a simple non-cascade network structure to evaluate the basis performance. The topology and node of the network's simulation model, and the obtained simulation results are given in order to assess system performance and to lay the foundation for determining the key parameters of the system. Conclusively, Tests on board has proved these modules are correct and well-performed to realize the ADN full-duplex Ethernet switching.