useful VHDL document for programmer

verilog code for 3 bit sequence detector

使用spi模式初始化w5100，实现了快速以太网的初步建立(Using the spi mode initialization w5100, to achieve the initial establishment of a Fast Ethernet)

通信中常用的PN序列产生器的源代码全部打包(Communications commonly used in PN sequence generator, the source code of all packaged)

说明：  用MATLAB设计及FPGA实现IIR滤波器的方法 摘要 本文介绍了IIR数字滤波器的传统设计思想与步骤及计算机辅助设计方法。并在FPGA上高效实现的低阶IIR滤波 器，其阶数低，实时响应快，适合雷达等的实时、高效处理环境。利用IIR滤波器的多相结构来实现该滤波器系统的方法，对于 四通道的情形在MATLAB上利用Simulink作了仿真, 并在目标板上对算法进行了实现,证明该系统能够同时处理四个通道的信号。(Using MATLAB Design and FPGA realization IIR Filter method Abstract This paper introduces IIR digital filter traditional design Thought and steps and CAD method. And FPGA on efficient realization low IIR filter, its order low, real response fast suitable radar real time, efficient processing environment. Use IIR filter multiphase structure realize the filter systematic method, for four channel circumstances in MATLAB on use Simulink made simulation and target board algorithm was realized proved system can simultaneously four channel signal.)

This is a simple verilog code for stopwatch undre xlinx ISE webpack based for NEXYS3 board.

VHDL_count 从 0 到 9 4 7 段 LED 显示 4 脉冲使 （đếm 慈 0 đến 9 hiển 施耐 4 带领 7 đoạn với 4 xung 启用）

说明：  数电实验FPGA verilog代码，包括秒表、全加器、半加器等。(FPGA Verilog code for digital experiment)

BCD to 7 segments display decoder

FPGA对系统50M时钟进行分频。FPGA最基本功能基础(FPGA Verilog program, key detection, program jitter elimination, jitter elimination, delay detection keys)

键盘接口电路的一个工程---包括vhdl源程序和编译后产生的相关文件-Keyboard interface circuit of a project--- including VHDL source code and compile the relevant documents after