基于LVDS的速度自适应数据回读系统设计与实现

At present, there are many types of missiles, and the installation location, cable length, and number of interfaces of the offline collection equipment are inconsistent, resulting in inconsistent data transmission speeds of the same collection equipment in different types of missiles, and the readback equipment cannot uniformly read back all data of offline data acquisition equipment. In view of the above problems, a data readback system which was compatible with different transmission speeds was proposed. The data transmission bus adopted the LVDS transmission interface, and the differential serial bus could realize long-distance transmission with strong anti-interference performance. The data readback system could adaptively transmit the LVDS clock on the bus, deserialize the serial data according to the LVDS clock, and provide a global clock synchronized with the recovered data, allowing FPGA internal logic to transmit data and align the data through encoding, and to achieve different transmission speeds compatible with the clock. By dynamically adjusting the phase relationship between the data and the clock, eliminating the impact of cable and PCB lengths or temperature factors on the transmission, the bit error rate of data transmission is reduced, compatible with faster data transmission speed. The collected data was sent to the PC through the flexible and reliable USB2.0 interface.