基于FPGA的千兆以太网端口通信设计OA

In view of the problem of Ethernet transmission rate and real-time in embedded field,a design of Gigabit Ethernet port communication based on FPGA(Field Programmable Gate Array)is proposed.This study de-signs the forwarding function of Gigabit Ethernet switch,and implements end-to-end data communication based on label forwarding.Datagrams with label are sent by CPU(Central Processing Unit),and are outputted through Gigabit Ethernet interface,and are sent to FPGA through RGMII(Reduced Gigabit Media Independent Interface)port.FPGA judges output port number field in label through internal logic and removes label,and outputs data-grams to connecting device from corresponding Gigabit Ethernet interface.Peripherals input datagrams through Gigabit Ethernet ports,and send datagrams to FPGA through SGMII(Serial Gigabit Media Independent Interface)protocol.FPGA adds labels through internal logic and outputs them to CPU through polling,so as to realize inter-working of connecting devices of multiple Gigabit Ethernet interface.The experimental results reveal the feasibility and effectiveness of the FPGA logic.The transmission rate reaches 1 Gbit·s-1,the datagrams forwarding delay is less than 100 μs,and the packet loss rate is 0%,which indicates that the data transmission stability is high,and the proposed design meets the actual needs of existing projects.