Hardware Design Of Multi-protocol Real-time Network Data Conversion System

Distributed data acquisition system has the characteristics of high reliability,strong adaptability,and good real-time performance.It is widely used in marine exploration,underwater early warning and other fields.As an important part of the distributed data acquisition system,the data conversion system is responsible for receiving the front-end sampling data and preprocessing it,and transmitting it to the back-end signal processing equipment in real time through multiple protocol interfaces.The development of a data conversion system that supports high-bandwidth,multiprotocol transmission has high engineering practical value.The multi-protocol real-time network data conversion system uses PowerPC series embedded CPU and Xilinx Artix-7 series FPGA to form a heterogeneous computing platform,which realizes front-end sampling data reception,data preprocessing,data buffering and transmission,etc.,and communicates with back-end data through multiple external interfaces.End signal processing equipment communication.The system receives the sampled data of the front-end acquisition system through the ATM interface,and the embedded CPU completes the preprocessing.Through the GMII interface and FPGA to achieve high-bandwidth communication to complete data forwarding;through the multi-channel parallel LVDS interface to communicate with the data storage device to achieve data recording,Playback function;interact with data processing equipment through multiple parallel RS485 interfaces;interact with network switching equipment through multiple gigabit network interfaces.In this thesis,the signal integrity simulation verification of the designed prototype system was carried out,and the system hardware circuit and key signal quality were tested;the interface function verification was completed and the overall function of the prototype was tested.After testing,the system functions and indicators have met the design requirements.