VXI总线高速大容量数据采集模块

本文根据某舰空导弹自动测试系统的要求,设计了基于VXI总线的4通道高速数据采集模块.它以SDRAM为数据缓冲单元,用FPGA实现控制和与VXI总线的接口.控制程序采用自顶向下的模块化设计方法,用VHDL实现电路行为的描述.采用状态机(FSM)控制整个流程,实现了各路控制信号的可靠同步.针对SDRAM控制复杂的特点,设计了基于FPGA的SDRAM控制器.驱动程序和应用程序用LabWindows/CVI编写.测试结果表明,模块的采样频率可达200 MHz,有效位数为7.76位,达到了预期的指标.

High-speed and large-scale data acquisition module based on VXI bus

According to the requirement of the vessil-space missle automatic testing equipment system,a 4-channel high-speed DAQ module based on VXI bus has been designed.With the SDRAM as data buffer cell,the module uses FPGA to realize the control and the interface of VXI bus.The control program describes the circuit behavior in VHDL by employing the top-to-bottom modularized design method and uses the FSM to syncoronize the control signals reliably.To solve the complicated control of the SDRAM,the SDRAM controller based on FPGA has been designed.The driver program and the App program are compiled by LabWindows/CVI.The tested results indicate that the highest sample frequency is 200 MHz,the significant digit is 7.76,and the module has met the requirement of the design.