非常优秀的国外VHDL设计教程，可进行MODELSIM模拟等操作

sin波形发生图形，应用智能老师款到即发了快速打击 (sin waveform generation graphics application smart teacher paragraph to that made a rapid strike)

VHDL programmes for basic digital circuits. begineers can learn easily

GFHGFHGFH DFHFDHD GHDHFDHHFD DFHFDHDF

采用Verilog HDL语言编写的直流电动机控制系统，主要完成直流电动机的速度控制，典型的三闭环(位置、转速和电流反馈)直流电机控制系统，对控制类相关的学习者价值很高(Using Verilog HDL language of the DC motor control system, mainly the completion of DC motor speed control, a typical three-loop (position, speed and current feedback) DC motor control system for control-type high-value related to the learner)

这个是讲pll的具体用法的,一般在fpga设计中都会用到 他,这个是lattice的xp2的pll的介绍,不过,fpga 都是相通的其他两家也差不多(Pll say this is the specific usage, the general design in the FPGA will use him, this is the lattice of the pll of xp2 introduction, however, fpga are connected to other two similar)

uart发射机Verilog HDL代码(Verilog HDL code uart transmitter)

基于FPGA芯片，在Nios II IDE软件的开发环境下写的NIos II 软核uart源代码！-Based on FPGA chip, the Nios II IDE software development environment written in NIos II soft-core uart source code!

verilog语言写的一个四层电梯程序，有优先级的判断。(verilog language of a four-story elevator procedures to determine priority.)

8位十六进制频率计设计 根据频率的定义和频率测量的基本原理，测定信号的频率必须有一个脉宽为1s的输入信号脉冲计数允许信号；1s计数结束后，计数值被锁入锁存器，计数器清零，为下一测频计数周期做好准备。测频控制信号可由一个独立的发生器（FTCTRL）来产生。-8-bit hexadecimal Cymometer designed in accordance with the definition of frequency and frequency of the basic principles of measurement to determine the frequency of the signal must have a pulse width of the input signal for 1s permit pulse counting signal 1s counting after the total value was locked into the lock depositors, counters cleared for the next count cycle frequency measurement ready. Frequency control signal generator may be an independent (FTCTRL) to generate.

说明：  DDS的基本原理主要由五部分组成，分别是；相位累加器，正弦波形存储器，数模转换器，低通滤波器和时钟，将相位累加器输出的数据作为地址，用来查询表的数据，将取出的正弦数据通过数模转换器输出模拟信号，模拟信号再通过一个低通滤波器输出纯净的正弦波信号。(The basic principle of DDS is mainly composed of five parts: phase accumulator, sinusoidal waveform memory, digital to analog converter, low-pass filter and clock. The output data of phase accumulator is used as address to query the data of table. The extracted sinusoidal data is output analog signal through digital analog converter, and the analog signal is output pure sine through a low-pass filter Wave signal.)