基于quartus 的一些程序 都是verilog 还是比较有用的

本程序利用VHDL实现二维离散余弦变换，经本人测试，在Quartus II7.0软件上可正确仿真，希望大家积极采纳

说明：  环路滤波器是通信信号调制解调中最重要的一个部分，环路滤波器设计的好坏将直接影响到接收机的性能指标，二阶锁频辅助三阶锁相环路滤波器可以稳定跟踪具有加加速度的信号源，是现代通信中非常实用的技术，本文中详细编写了单载波信号产生模块、信道噪声模块、数字正交下变频模块、鉴频鉴相模块、环路滤波器模块，并包含了完整的testbench模块，对于初学者非常有用。(Loop filter is the most important part of communication signal modulation and demodulation. The design of loop filter will directly affect the performance index of receiver. The second-order frequency locking assisted third-order phase-locked loop filter can stably track the signal source with acceleration speed, which is a very practical technology in modern communication. In this paper, the single carrier signal generation module and channel noise are written in detail Sound module, digital orthogonal down conversion module, frequency and phase detection module, loop filter module, and contains a complete testbench module, which is very useful for beginners.)

LCD例程 altera官方Verilog代码 详尽简单实用-LCD routines altera official Verilog code is simple and practical details

一款在Verilog实现的吃豆人游戏，采用VGA接口，在Nexys3开发板上运行无误。(A pac-man game implemented via Verilog, using VGA interface, perfectly run on Nexys 3)

从FIFO到到RS232的实现，用于接收和缓存数据(TripAdvisor RS232 FIFO implementation for receiving data and cache)

说明：  内部含3个模块，使用DDS产生200k与500k的正弦波，两者相加后过数字低通滤波（通带0-200k，阻带400k以上），并将波形输出，实测FFT分析中看不到500k分量。其中数字滤波器采用MATLAB设计（FIR+等波纹，阻带衰减-80dB）(There are three modules in the system. DDS is used to generate 200K and 500K sine waves. After adding the two modules, the digital low-pass filter (passband 0-200k, stopband above 400k) is used, and the waveform is output. 500K component can not be seen in the actual FFT analysis. The digital filter is designed by MATLAB (FIR + equal ripple, stopband attenuation - 80dB))

说明：  Simetrix EMI滤波器设计，实际测试有效果。(Simetrix EMI filter design, the actual test results are effective.)

超前进位加法器得VHDL实现小点资料代码(CLA was a small point of information VHDL code)

基于FPGA的任意波形信号发生器,可实现频率、幅度、相位的调节，输出方波、正弦波、锯齿波(Arbitrary waveform generator based on FPGA)