基于FIFO存储的高速脱机波形记录系统

High- Speed Offline Waveform Recording System Based on FIFO Storage

对于一组作用时间短,发生时刻不确定的波形,直接使用PC计算机系统记录难以实现。该波形记录系统通过被动触发的方式以指定的采样周期记录指定时间长度的波形,在实验需要时通过USB总线传至上位机。其中使用CPLD控制和协调数据采集与存储的过程,包括提供多路复用器的选路信号,模数转换器的时钟信号和FIFO写数据时钟与控制信号;最终用户可以通过上位机软件控制EZ-USB芯片以GPIF方式从FIFO中读取数据。

IS is hard to record a group of short - time waveform which is uncertain to occur directly by PC computer. The Waveform recorder could record a group of waveforms in a specified time with a specified sampling period, and then submit them to PC computer when necessary. In this system, a CPLD managed the record process by sending address signal to Multiplexer and gen- erating ADC clock signal, IFO write data clock and control signals.