VHDL开发的计数器。源程序不复杂，应该都能看懂。最重要的注意：是时序问题

ddr2 controller功能控制,里面有四个模块-ddr2 controller functions to control, which has four modules

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利用VHDL语言设计一个分频器，输入为CLK,输出分别为CLK1、CLK8、CLK256、 CLK1024-The use of VHDL language design a divider, input CLK, the output respectively, CLK1, CLK8, CLK256, CLK1024

dataflow muliplexer in FPGA

freeDev数字应用开发板中的VGA控制器的IP核的verilog实现-freeDev digital application development board of the VGA controller IP core implementation of the verilog

Aurora 8B/10B协议是Xilinx公司针对高速传输开发的一种可裁剪的轻量级链路层协议，通过一条或多条串行链路实现两设备间的数据传输。协议Aurora协议可以支持流和帧两种数据传输模式，以及全双工、单工等数据通信方式。(The Aurora 8B / 10B protocol is a tailor-made lightweight link layer protocol developed by Xilinx for high-speed transmission that enables data transfer between two devices over one or more serial links. Protocol Aurora protocol can support two data transfer modes, stream and frame, as well as full-duplex, simplex and other data communications.)

通过上翻键和下翻键来设置方波信号正负脉冲宽度，利用一排流水灯来显示按键的次数，通过观察流水灯亮的盏数确定占空比（按一次上翻键亮一盏灯，流水灯全亮时占空比调到了最高或者是最低状态，按一次下翻键灭一盏灯，流水灯全灭时占空比调到了最低或者是最高状态）。(Duty cycle of LED lights and adjustable oscilloscope display code)

说明：  fpga实现相关滤波算法中的CSK算法，采用仿真的方式验证结果 fpga是xilinx 仿真工具是vivado2018.2 语言是verilog(The CSK algorithm is implemented in FPGA, and the results are verified by simulation FPGA is Xilinx The simulation tool is vivado 2018.2 Language is Verilog)

it contains pdf file which has vhdl program of uart (universal asynchoronus receiver and transmitter). which very simple and easy to understand