基于FPGA主备倒换的电路设计与实现

Implementation of Main /Standby Switch Circuit Based on FPGA

针对机架式OLT通信设备在运行时必须具备高可靠性,同时结合光接入网域中数据业务冗余备份的实际需求,提出一种基于FPGA逻辑控制的主备倒换电路的设计,实现主备设备的快速且无缝式倒换。通过FPGA读取和传递主备状态信息的编码替代传统主备CPU之间发送报文的通信模式,使得CPU在启动过程中的各个状态更加平稳、主备竞争机制更加完善。应用表明,该方法在提高倒换速度及稳定性方面效果明显。

The OLT communication equipment, especially with the needs of data backup in the optical access network, must have a high reliability in the operation. A design of main/standby switch circuit based on FPGA logic control is proposed, which realizes switching quickly and seamlessly. The method which is through FPGA reads and transfers the coding of state information, instead of the traditional exchanging packets of messages between CPUs. This method can be more stable in initial state during the start-up process and more promptly than the traditional one in the main/standby compe- tition. And it is verified in the applications.