实用的程序代码，希望对大家有用，已经调试通过

vhdl的3-8译码器-instantiate the 3-8 decoder

可实现两个4bit补码的加法及减法，有溢出提示(adder with overflow hint)

dpim是光通信中使用的一种调制方式，这里提供的是它的环回代码，自己可以根据需要拆开了下载到两块板子上。(dpim is used in an optical modulation, here is its loop-back code, they can download needed two apart on the board.)

this is "AND" gate implementation in VHDL

verilog语言实现一个CPU，汇编程序实现汉明编码功能，输入11位代码，输出15位编码结果。(Verilog language to achieve a CPU, assembler to achieve Hamming coding function, enter 11 bit code, output 15 bit encoding results.)

vhdl语言主要描述语句的说明和使用方法，内附例子可供学习提高-VHDL language description of the main description of statements and the use of methods, containing examples for learning improve

串口程序 VHDL-Serial procedures VHDL

数字频率计的设计，显示0~999的频率 整个程序代码都是通过vhdl语言来完善的 功能模块多样，详细的介绍了多模块的各个功能

一个SDH中最基本传输模块STM-1的帧头检测器，verilog编程实现-A basic SDH transmission module STM-1 Header detector, verilog Programming

实现大型LED屏显示的CPLD程序，对FPGA学习很有帮助-To achieve large-scale LED screen display of the CPLD program, very helpful for learning FPGA