多个VHDL编码的例题，详细的电路图介绍，还有流程图

vc707 board ucf xdc files

说明：  1、能正确显示输入信号频率； 2、测量频率范围为1Hz ~ 999999Hz； 3、测量结果以十进制数字显示； 4、能测量幅值较小的信号频率； 5、有自动刷新输出数据的功能（如5s刷新一次）； 6、有自检模块（如产生100Hz的校准方波）；(1. It can correctly display the input signal frequency; 2. The frequency range of measurement is 1Hz ~ 99999hz; 3. The measurement results are displayed in decimal; 4. It can measure signal frequency with small amplitude; 5. It has the function of automatically refreshing the output data (e.g. once in 5S); 6. Self checking module (such as generating 100Hz calibration square wave);)

关于寄存器重命名register reallocation,VHDL-Register on rename register reallocation, VHDL

说明：  Verilog AXI Components Readme GitHub repository: alexforencich verilog-axi

实现了UART的底层协议，加入了控制器，其波特率可以根据使用进行调整；发送模块、接收模块相互独立，互不影响。(Realization of the underlying protocol UART, joined the controller baud rate can be adjusted according to use transmission module, receiver module are independent of each other.)

用窗函数法设计一个线性相位FIR数字低通滤波器，用理想低通滤波器作为逼近滤波器，通带截止频率为0.2 ，阻带截止频率为0.4 ，阻带衰减不小于-40dB。(Window function method to design a linear phase FIR digital low-pass filter, as an ideal low-pass filter for approximation filter passband cutoff frequency of 0.2 stopband cutoff frequency of 0.4, the stop-band attenuation of less than-40dB.)

FPGA设计的指导原则，很经典的！希望给大家方便-FPGA design of the guiding principles, it is classic! Want to give everyone easy

用VerilogHDL编写的，一个占空比为50％的6分频电路-prepared using Verilog HDL, a 50% duty cycle for the six sub-frequency circuit

在ＦＰＧＡ中产生的频率可调的锯齿波型信号发生器(The frequency of the FPGA to generate the sawtooth waveform signal generator adjustable)

FPGA实现BPSK调制，带Modelsim仿真，实际系统测试通过，载波信号，调制波信号频率可调(FPGA implementation BPSK modulation with Modelsim simulation, the actual system test, the carrier signal, modulated wave signal frequency adjustable)