quartusii 三分频电路，大家帮参考一下，有什么问题

SAA7113 ＦＰＧＡ开发实例，非常经典(The SAA7113 FPGA development examples, very classic)

PWM调制流水灯的亮度，可以看到流水灯从亮到暗(PWM modulation)

基于VHDL语言开发的I486总线接口程序。实现了一个三态的总线，可保证数据的正常传输。-based on VHDL development of the I486 bus interface procedures. Implementation of a three-state bus can ensure that the normal data transmission.

本代码实现了486总线的功能，初学者可以借鉴学习-This code implements the 486 bus functions, beginners can learn to learn

实现qpsk解码，适合新手学习，代码简单，好用(mplementation of QPSK decoding)

一个简易的数字频率计，可以对一个输入的信号频率进行测量并显示输出，适合VHDL的初学者-A simple digital frequency meter, you can enter the signal of a frequency measurement and display output, suitable for beginners VHDL

基于DE2的视频电话部分源码，实现了视频图像采集，VGA显示，局域网通讯等功能-DE2-based video telephony part of the source code to achieve the video image capture, VGA display, LAN communications function

VHDL常用实例，适合初学者，有计时器等常用例子-Common examples of VHDL, suitable for beginners, there are examples of commonly used timer, etc.

运用vhdl程序设计语言进行ppm设计，ppm 设计在vhdl语言中非常常用，运用已经越来越广泛。-use vhdl program design language ppm design, vhdl ppm design in a very common language, has become increasingly widespread use.

说明：  LDPC码的FPGA实现，用verilog语言编写(FPGA implementation of LDPC code, written in Verilog language)