Vxworks-based Distributed Switch The Mcu Kouban Design And Realization

The traditional switch is mainly worked in the second layer-Data Link layer of the OSI model. Although the router which is the third layer network device is flexible in routing, but the low performance cost rate is become the bottle-neck of its application. As the development of the network technology, the band of the network become wider, G-bit or T-bit Ethernet has more applications. So the third layer switch is bring up, it has all functions of the second layer switch, and add some technology such as VLAN and routing. The third layer switch bands together the advantage of the second layer switch and the router, it also provide the Qos and the security access mechanism.The distribute switch mainly use the CrossBar framework, it is also named Cross point. It is the first choice of the big capacity network construction. There are many advantages of the CrossBar framework, for example, it can provide very high throughput and there is no congestion internally, the implementation is simple comparatively.The main concept of the paper is the design and the implement of the MCU board of the distribute switch. The research content include VxWorks RTOS, the concept and the design method of the VxWorks BSP, the architecture of the PowerPC, the PCI local bus and some relatives of the CPLD. The main works as follow:Firstly, the architecture research of the distribute switch and the research of the VxWorks and the Tornado.Secondly, the hardware design of the MCU board, include the PowerPC studying and the selection of the component. At last I will introduce the detail of the every module.Thirdly, complete the VxWorks BSP design; include the initialization of the VxWorks and the hardware, the seeking and initialization of the PCI devices.Fourthly, summarize the experience of the development and test work, and give the prospect in the future research.