Interfacing of Cross Channel Data Link for Fly-By-Light

The Cross Chanel Data Link(CCDL) is an important device for exchanging information between three-redundancy flight control computers.Formerly developed three-redundancy fly-by-light system commonly used the serial port(RS232) protocol with low transmission rate,which could not meet the requirement of data transmission among modern flight-control computers.In view of this situation,a bidirectional high speed fiber optic data transmission interface card was designed based on PCI bus controller PLX9054 and the FPGA,and the basic structure and composition of the data transmission card were given.The design method of PCI bus interface hardware and software,timing sequence,and the matters needing attention were described.The implementation techniques of the photoelectric conversion module and the logic function module on FPGA were analyzed.Finally the device driver based on Driver Studio was developed and a communications test was carried out.The result showed that the system can satisfy the requirement of redundant data transmission among flight control computers.