a program which divides the clock by 3

根据软件无线电的思想，提出了一种新颖的数字信号处理算法，对QPSK信号的相位进行数字化处理，从而实现对QPSK信号的解调.该算法允许收发两端载波存在频差，用数字锁相实现收发端载波的同步，在频偏较大的情况下，估算频偏的大小，自适应设置环路的带宽，实现较短的捕获时间和较好的信噪性能。整个设计基于XILINX公司的ISE开发平台，并用Virtex-II系列FPGA实现。用FPGA实现调制解调器具有体积小、功耗低、集成度高、可软件升级、扰干扰能力强的特点，符合未来通信技术发展的方向。(According to the idea of software radio, a novel digital signal processing algorithm, the phase of QPSK digital signal processing, enabling the demodulation of QPSK signals. This algorithm allows the sending and receiving ends of the carrier frequency difference exists, using digital phase-locked to achieve synchronization of sending and receiving end of the carrier, in the case of large frequency offset, frequency offset estimation of the size, adaptive set the loop bandwidth to achieve shorter acquisition time and better noise performance. The whole design is based on the company XILINX ISE development platform, and Virtex-II series with the FPGA. FPGA realization of a modem with a small size, low power consumption, high integration, software upgrades available, the characteristics of strong interference interference, in line with the future direction of ICT development.)

基于NiosII系统的可以在DE2-115板子上运行的吞食蛇游戏！（可以使用RS2键盘进行控制）(DE2-115 board NiosII system swallowed snake game! , (RS2 keyboard control))

these are the source codes for the book " 100 power tips for FPGA designers"

usb1.1的设备控制器IP核，是用verilog硬件描述语言写的-USB1.1 IP core for device control, written with hardware describing language of Verilog.

VHDL经典设计，值得参考。压缩包里面文件直接用记事本打开即可。-VHDL design classic, it is also useful.

vga接口的工程实现，基于altera环境，需要的可以-vga interface engineering implementation, based on altera environment, need to take a look at

说明：  介绍了Displayport规格中lind training的背景研究，设计和实现。(As the requirement for bandwidth continues to increase in the video market, retaining the signal integrity becomes increasingly more difficult. For many of todays commonly used video interfaces, there are devices that can be used to assist in this matter. However, the use of such a device is only partially documented in the DisplayPort specification for the receiving image device, which means that the receiving side of the video link is free to choose its own implementation. This report presents, together with background research and design decisions, a suggestion for such an implementation. This implementation would need to be compatible towards a wide range of possible video Source devices and DisplayPort cables.)

说明：  LIUSHUIDENG VHDLYUYAN XIADE SHUIDENG(LEDWATER I WRITER IT MYSILF.IT'S EASY ! YOU CAN WRITER IT,TOO)

上海大学 Verilog PPT 适合初学者看 推荐 -Shanghai University Verilog PPT look recommended for beginners

DES加密算法的VHDL实现,采用流水线技术实现(The VHDL implement of DES encrypt algorithmic)