This code for countor . it is design in verilog HDL.

DDR3控制器源码，针对XilinxFPGA的DDR3控制器的源码，已经验证通过。(DDR3 Controller，complete DDR3 controll，have pass verificaion.)

C语言写得FIR滤波器代码，简单实用，是学习滤波器设计的好材料，附带PPT滤波器设计说明(C language written FIR filter code, simple and practical, is a good learning materials of filter design, with PPT filter design )

基于FPGA的相位测量原理图，通过对正弦信号过零比较进入FPGA，测量相位差。可用于测量导纳等应用中。

PID控制器的verilog实现，做闭环控制器的人可以参考(PID controller verilog implementation of closed-loop controller may make reference to)

说明：  Xilinx Licenses 2018

DDR（双速率）SDRAM控制器参考设计verilog代码，可以直接用的，很好的-DDR (double rate) SDRAM controller reference design Verilog code, can be directly used, very good

VHDL Bible. It is a must read for any front end vlsi designer.

基于FPGA的PCI9054 LOCALBUS总线接口(PCI9054 interface program based on FPGA)

用FPGA实现sos摩尔密码，即输出电平信号短长短。就是有次序的控制输出莫斯密码的“点”，“画”和“间隔”。而 control_module.v 是一个简单的定时触发器，每一段时间都会使能sos_module.v。(Realized by FPGA sos mole password, the output signal level of short duration. There is a sequence of output control points Moss password, painting and intervals. And control_module.v is a simple timer triggers, each period of time will enable sos_module.v.)

一个具有置位、复位、左移和右移功能的八位移位寄存器/“01011010”序列检测器。移位寄存器电路端口为：异步清零输入端口rst，输入时钟clk，置数判断输入端口load，移位类型判断输入端口m，数据输入端口data[7:0]，输出端口q[7:0]。序列检测器电路端口为：异步清零输入端口rst，输入时钟clk，串行数据输入端口d，输出标志端口s。(A eight bit shift register / 01011010 sequence detector with set, reset, left shift, and right shift function. Shift register circuit port is: Asynchronous Clear input port rst, input clock CLK, set the number to determine the input port load, shift type to determine the input port m, data input port data[7:0], output port q[7:0]. The sequence detector circuit port is: Asynchronous Clear input port rst, input clock CLK, serial data input port D, output flag port s.)