Pxi Analog Signal Input/output Module

With the fast development of instruments and automatic test technology recently,based on the instrument buses such as PXI/CompactPCI、VXI and so on, modularautomatic test system is applied widely in laboratory studies,test and measurement andindustrial automation.As the link of the nature and the digital world,analoginput/output module in automatic test intruments holds an import position.In this paper the design analog input/output module based on PXIarchitecture,containing both two channels analog signal input and8channels analogsignal output.This module can acquisite analog signal,with sampling rate is up to200MSPS， store mass of data by DDR2SDRAM to achieve32MB storage depth of eachchannel,transmit data to the PC through the PXI interface.This module also provides8channels analog signal output with100kHz update rate,receives arbitary waveformdata from the PC through the PXI interface and stores the data in the DDR2SDRAM,uses Direct Digital Frequency Synthesis principle to output8channels ofarbitary waveform,providing multi-channel measuring signal source.And realizes logiccircuit in the FPGA to control the work of the whole module,and the data transmissionbetween these unit circuits according the commands sent from the PC through PXIinterface.This paper expounds the hardware design of the PXI analog signal input/outputmodule,including the design of the analog signal input channel,analog signal outputchannel,data storage circuit, PXI interface circuit,FPGA internal logic circuit and soon,and focuses on the FPGA internal logic circuit design.FPGA logic design includesthe implementation of PCI9054local interface logic,the realization of DDR2SDRAMcontroller,the receiving and storage of the data generated from A/D,the digital part ofDirect Digital Frequency Synthesis.Finally gives the result of commissioning andvalidation,proves the feasibility of the system design scheme.