基于SpaceWire时间码备份路由器实现与分析

Implementation and analysis of backup router based on SpaceWire Time-Code

SpaceWire是由欧空局提出的新一代总线技术,作为新一代总线技术SpaceWire在链路故障检测、故障恢复等方面得到了加强[1]。同时为了解决链路拥堵和减少网络传输延时[2],SpaceWire-D提出了在网络中流通时间码、调度表的运作机制。航天领域对设备的可靠性有着严格要求,路由器作为网络中不可缺少的组成部分,路由器的可靠性影响着通信系统的可靠性[3]。本方案在改写Dundee路由IP核后实现一个路由器的基础上提出单板双路由结构,利用SpaceWire标准时间码保留位其中的一位与路由器模式切换相结合,达到实现路由器的热备份功能的目的,从而提高SpaceWire路由器的可靠性。最后通过测试平台加以测试证明路由的模式切换功能可以正常工作,并通过分析比对说明本方案提出的备份方案提高了路由器的可靠性。

SpaceWire is a new bussing technique provided by European Space Agency.As the new bussing technique,SpaceWire enhances the functions of error detection and error recover[1].In order to solve the problem of blocking in the net and reduce the SpaceWire delay[2],SpaceWire-D performs the time-code flowing in the net and schedule table.Aerospace has high requirements for the reliability of devices.Router is the indispensable component in the net,the reliability of the router affects the reliability of the net[3].This text based on accomplishment of the SpaceWire router by modifying Dundee router IP Core applies the structure that one board with two routers,it uses the corporation between one of the reserved bits of time-code in SpaceWire and mode-shift of the SpaceWire router to realize the hot backup function and enhance the reliability of the SpaceWire router.Finally,by using testbench to prove the function of mode-shift,it can work properly,analysis and comparison prove that this scheme can enhance the reliability of the router.