4位电子密码锁，带键盘扫描、按键防抖动、LCD驱动编译码

一个使用VHDL设计的具有强大功能的32位CPU，这个文件包含了与之配套的DDR控制器程序！-A VHDL design with the use of powerful 32-bit CPU, this document contains a complete set of DDR controller program!

本模块的功能是验证实现和PC机进行基本的串口通信的功能。需要在PC机上安装一个串口调试工具来验证程序的功能。程序实现了一个收发一帧10个bit（即无奇偶校验位）的串口控 //制器，10个bit是1位起始位，8个数据位，1个结束 //位。串口的波特律由程序中定义的div_par参数决定，更改该参数可以实 //现相应的波特率。程序当前设定的div_par 的值是0x145，对应的波特率是 //9600。用一个8倍波特率的时钟将发送或接受每一位bit的周期时间 //划分为8个时隙以使通信同步. //程序的工作过程是：串口处于全双工工作状态，按动key1，FPGA向PC发送“21 EDA" //字符串（串口调试工具设成按ASCII码接受方式）；PC可随时向FPGA发送0-F的十六进制 //数据，FPGA接受后显示在7段数码管上。 //视频教程适合我们21EDA电子的所有学习板(this is a base vhdl for uart progarm.)

verilog编写的QPSK发射机的ＦＰＧＡ部分，已经过验证，完全达到要求。调制矢量误差４％(QPSK transmitter verilog prepared by the FPGA portion, has been proven, fully meet the requirements. Modulation vector error of 4 )

该代码为VHDL语言描述的AD579 SPI通讯程序，包括一些代码注解。(Thisis a SPI communication promgram of AD5791 designed with VHDL which compared with some discreption.)

This project features a full-hardware sound compressor using the well known algorithm: IMA ADPCM. The core acts as a slave WISHBONE device. The output is perfectly compatible with any sound player with the IMA ADPCM codec (included by default in every Windows). Includes a testbench that takes an uncompressed PCM 16 bits Mono WAV file and outputs an IMA ADPCM compressed WAV file. Compression ratio is fixed for IMA-ADPCM, being 4:1. PLEASE NOTICE THAT THIS CORE IS LICENSED UNDER http://creativecommons.org/licenses/by-nc-sa/3.0/ (Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported). That means you may use it only for NON-COMMERCIAL purposes.

开发工具是quartus II 7.0以上版本，这是一个verilog语言的分频器设计，个人作业设计，供参考学习(verilog，quartus II 7.0)

常用的锁相环技术，此程序是我在设计高频电路中运用的，具体见程序，经调试无问题(Commonly used phase-locked loop technology, this program is in the design I used in high-frequency circuits, see the specific procedures, no problem by debugging)

turbo product code used in error correction

fpga配置锁相环完整程序，使用quartus IP核，Verilog语言。(FPGA configuration PLL complete program, Verilog language.)

verilog实现DLX指令集5段流水线(5 stage DLX pipeline implemented in verilog)