Seamless Acquisition Module Design In Multi-FPGA Architecture Oscilloscope

With the rapid development of electronic information technology,the analog signals are sporadic and complex.In order to find abnormal signals in the electronic system,the acquisition system needs to have a higher sampling rate and waveform capture rate to capture and analyze the signal.Based on the MSO digital oscilloscope platform,this thesis applies the 3D mapping technology to design and realize the seamless acquisition function based on multi-FPGA architecture,and builds a high-performance 3D mapping system based on ping-pong alternate processing to achieve a higher real-time waveform capture rate.The application of segmented storage technology realizes the centralized mapping processing function of segmented storage,so that the system can realize the seamless acquisition of waveform data during the segmented storage,and improve the system’s ability to capture occasional signals.The main research contents of this paper are as follows:1.Based on the basic principle of 3D mapping and the hardware architecture of MSO oscilloscope,design and realize high-performance 3D mapping system based on pingpong alternate processing and multi-channel parallel mapping.By adding ping-pong operation,collects waveform data and alternately transmits it to the 3D mapping module for parallel mapping.The number of channels,sampling resolution and parallel mapping channels in the mapping system are parametrically designed,so that the mapping system can adapt to the three-dimensional mapping function of different types of oscilloscopes by modifying the relevant parameters,which improves the versatility of the mapping system.In this thesis,the point mapping and vector mapping processing functions of the system are realized.Through the ping-pong control data acquisition and transmission and multi-channel parallel mapping processing of the acquired data,the waveform capture rate of the digital oscilloscope is improved,so that a certain type of digital oscilloscope can realize 1000000wfms/s capture rate.And realize the digital trigger function in the data processing process to make the waveform display stably.2.On the basis of MSO digital three-dimensional oscilloscope,the oscilloscope FPGA+DDR3+CPU architecture is used to realize the centralized mapping function of segmented storage.Divide the DDR3 SDRAM memory into multi-segment storage areas（maximum number of segments is 65536）according to the corresponding waveform storage depths under different time-base gears,and continuously collect and store multiple waveform data to achieve segmented storage.The multiple waveforms stored in the memory are read out one by one for 3D mapping processing.3.The design realizes the display of monochromatic and cross-color systems of three-dimensional waveforms,converts the mapping probability information into RGB color information,and realizes the brightness adjustment function of three-dimensional waveforms.Based on the MSO digital oscilloscope platform,this paper completes the construction of a high-performance real-time 3D mapping system,achieving a waveform capture rate of 1000000wfms/s.Complete the waveform mapping function based on segmented storage,and convert the three-dimensional waveform probability information into color information and display it on the host computer screen.