ADC0809 AD转换器的VHDL程序实现-ADC0809 AD converter VHDL program realization

用fpga控制ad采集，用vhdl编写，可控制采样率-With fpga control ad acquisition, with vhdl written to control the sampling rate

韩福柱老师FPGA实验源码，用vhdl语言在xilinx FPGA上实现，包括ad采集，温度传感器读取，秒表，跑马灯和按键次数统计4个实验-Han Fu teacher FPGA column experiment source code, vhdl languages on xilinx FPGA implementations, including ad acquisition, temperature sensor readings, stopwatch, marquees and key

读取AD7895 的12位ADC转换值，连续读取方式，采样速率为20mS 一次。(Read the 12 bit ADC conversion value of AD7895.)