adc0809用FPGA控制的采样非常好用的实例 自己看书后终结的

  基于FPGA(Field-Programmable Gate Array)的OFDM(Orthogonal Frequency Division Multiplexing)信号传输系统VHDL源码 use IEEE.std_logic_unsigned.all; package outconverter is constant stage : natural := 3; constant FFTDELAY:integer:=13+2*STAGE; constant FACTORDELAY:integer:=6; constant OUTDELAY:integer:=9; function counter2addr( counter : std_logic_vector; mask1:std_logic_vector; mask2:std_logic_vector ) return std_logic_vector; function outcounter2addr(counter : std_logic_vector) return std_logic_vector; end outconverter; package body outconverter is function counter2addr( counter : std_logic_vector; mask1:std_logic_vector; mask2:std_logic_vector ) return std_logic_vector is variable result :std_logic_vector(counter"range); begin for n in mask1"range loop if mask1(n)="1" then result( 2*n+1 downto 2*n ):=counter( 1 downto 0 ); elsif mask2(n)="1" and n/=STAGE-1

7段数码显示译码器设计7段数码是纯组合电路，通常的小规模专用IC，如74或4000系列的器件只能作十进制BCD码译码，然而数字系统中的数据处理和运算都是二进制的，所以输出表达都是十六进制的，为了满足十六进制数的译码显示，最方便的方法就是利用译码程序在FPGA/CPLD中来实现。例子作为七段译码器，输出信号LED7S的7位分别接数码管的7个段，高位在左，低位在右。例如当LED7S输出为“1101101”时，数码管的7个段g、f、e、d、c、b、a分别接1、1、0、1、1、0、1；接有高电平的段发亮，于是数码管显示“5”。-7 digital display decoder design 7 Digital is pure combinational circuits, usually of small-scale dedicated IC, such as 74 or 4000 Series devices can only be used to decimal BCD decoder, but digital systems in the data processing and computing are binary, so the output expression are hexadecimal, and hexadecimal number in order to meet the needs of the decoding shows that the most convenient way is to use decoding process in FPGA/CPLD in to achieve. Seven-Segment decoder as an example, the output signal of the seven were LED7S access digital pipe 7 above, high in the left, low in the right. For example, when LED7S output as

详细介绍了VGA官方例程Verilog代码，非常好很实用

XVRWARE Library Xilinx Inc. The XVRWARE Synthesis library provides macros and synthesis examples for constructing TMR circuits in VHDL for the Virtex architecture

24bitAD数据采样进行串并转换，并行输出。另包括24位DA并串转换，串行输出。(24bitAD data sampling and converted to strings, parallel output. Other notable features include 24-bit DA and string conversion, serial output.)

接口模块，通过对高位地址的编码可实现在一个FPGA中配置四个独立的功能模块，每个功能模块具有一个带FIFO的输出口和13个独立的可由DSP读写的寄存器，寄存器功能可自定义。模块还包含两个全局寄存器，可实现全局复位，中断等功能。该模块以应用于实际的项目中，目前运行良好(FPGA to emif)

VHDL编写的4个led灯循环明暗变化，通过改变波形占空比实现，课堂作业自编程序-VHDL prepared by the four led lights cycle shading changes, by changing the waveform duty cycle to achieve, self-compiled class operating procedures

说明：  基于PCF8591数模转换和DDS技术的信号发生器系统设计(Design of Signal Generator System Based on PCF8591 Digital-to-Analog Conversion and DDS Technology)

m序列在dspbuilder下产生VHDL源码及其测试激励文件的matlab模型,在modelsim下仿真通过-m sequence in dspbuilder under VHDL source code and test incentives document matl ab model, the simulation under through modelsim

FFT VHDL code