一种基于双机热备系统的仲裁切换方案

A Solution of Arbitrary Switch-over Based on Dual-computer Hot Standby System

针对高可靠性的双机热备份系统,设计一种双机仲裁切换电路。以复杂可编程逻辑器件为核心,通过看门狗实现对双机系统中2块主板的状态监测,仲裁逻辑通过判断双机的状态实现双机间的自动切换。采用专用模拟切换开关,保证USB信号、以太网信号以及视频信号等高速信号的信号质量,并使用VHDL语言进行软件设计。结果表明:该方法有效可行,可实现主备机的状态监测及信号仲裁切换功能。该电路已成功应用于某型号系统中。

For high reliability double-computer hot backup system, an arbitration switching circuit was designed. The circuit with complex programmable logic device （CPLD） as the core monitors the two motherboards＇ status of the double-computer system, through the watchdog. The arbitration logic can automatic arbitrate and switch-over by judging the status of the two motherboards. It uses dedicated analog switch in the design to ensure the quality of high-speed signal as USB, Ethernet and video signal. Use VHDL language to design software. The results show that this method is effective and feasible. It can monitor the status of the active-standby computer and automatic switch. The circuit has been successfully applied to a project.