protel fpga library a popular package is very difficult to find the

采用VHDL编写的步进电机控制程序-stepping motor controlling program written by VHDL

Quartus中实现的DDS 使用的是altera提供的IP core-DDS achieved Quartus using IP core provided by altera

Thomas课本中的verilog例子。Thomas的verilog在可编程期间领域很有名-Thomas textbook example of verilog. Verilog Thomas in the field during the famous programmable

实现fpga上交通灯的设计，可以在开发板上实现红绿灯(Design of traffic lights on FPGA)

半带滤波器，用于sigma-delta DAC中的设计(Half-band filter for sigma-delta DAC design)

说明：  xilinx 平台的SPI从接口实现源码，供参考学习(used xilinx,slave-spi interface.)

哈希算法FPGA实现代码，采用MD5算法，并给出了仿真波形。(MD5 hashing algorithm for FPGA implementation code)

说明：  利用FPGA实现对外设按键的控制，例如用户库用按键控制跑马灯的效果(FPGA is used to realize the control of external keys, such as the effect of user database using keys to control the running horse lamp)

Block LU decompostion of a matrix

verilog基础练习，介绍怎样编写测试文件和仿真-Verilog based on exercises, how to introduce the preparation of test documentation and simulation