非常优秀的国外VHDL设计教程，可进行MODELSIM模拟等操作

HDLC协议的FPGA实现，运用了VHDL语言，主要就是解封帧HDCL，平切添加了外部接口

数字信号源，输出不同频率，相位的正余弦信号，-Digital signal source, the output of different frequency, phase is the cosine signal,

GPS 导航器TFT 驱动源程序。主CPU为ATmel的AT91sam9261（ARM926的内核）(TFT GPS navigation device driver source code. CPU for the AT91sam9261 ATmel (ARM926 the kernel))

本代码是用VRILOG语言写的SDRAM的控制器的标准代码,供开发SARM参考.-this code is used to write the language VRILOG SDRAM controller standard code for the development of SARM reference.

采用costas环进行DPSK解调的程序。输入数据速率2.4Kbps，载波频率12KHz，采样率1.6MHz， 输入数据位宽12位，快捕带为799.617Hz(Costas ring using DPSK demodulation process. Input data rate 2.4Kbps, carrier frequency 12KHz, sampling rate 1.6MHz, the input data 12 bits wide, fast catching band is 799.617Hz)

采用VHDL编写的七段数码管显示程序-prepared using VHDL paragraph 107 of the procedures Digital Display

QPSK调制的载波频偏估计，是一个可以调用的函数。接收端进行了一系列的处理。经典的L&R法(QPSK-carrier frequence offset estimation_ L&R)

circuit design with VHDL e-book MIT Press....

verilog 入门概述 新手学习资料-Getting Started with an overview of novice learning materials verilog

说明：  4位数码扫描显示电路,我们控制一个七段LED需要8个输出端口；如果要输出四位十进制数，就需要32的输出端口，这将占用大量的端口资源。采用串行扫描显示，我们只需要8+4共12个端口即可。其原理是：用一个四位的输出端控制，某一时刻只选中其中的一个LED（输出为‘1’表示选中），八位的输出端将该LED所需要显示的值输出；然后四位的输出端值改变，选中下一个LED。这样依次类推。如果选择的频率很快，达到50Hz以上，由于人眼的视觉暂留效应，看起来就像4个LED同时显示。 设计一个程序，输入四个一位十进制数，用4个LED显示出来。CLK采用频率可调信号发生器，逐渐改变频率，观察扫描频率的改变对输出效果的影响。 输入：连续脉冲，逻辑开关；输出：七段LED。 (4 digital scanning display circuit, we need to control a seven-segment LED output port 8 If you want to output four decimal numbers, you need the output port 32, which will take up a lot of ports. Serial scans showed, we need only 8 of 12 ports can be+4. The principle is: the output of four with a control, a time to select only one LED (output 1 is selected), 8 output of the LED by the need to show the value of the output then The output value of the four changes, select the next LED. This and so on. If you select the frequency rapidly, reaching more than 50Hz, as the human eye s persistence of vision effect, looks like a 4 LED display simultaneously. Design a program, enter a decimal number four, with four LED display. CLK signal generator with adjustable frequency, gradually changing the frequency of observed changes in scan frequency effect on the output. Input: Continuous pulse, logic switches output: seven-segment LED.)