该文件中是关于一些VHDL许多编程实例以及源码分析，希望对VHDL爱好者有用。卷3包括车载DVD位控系统、直接数字频率合成器、图像边缘检测器、等精度数字频率计、出租车计费系统的设计与分析-The document is on a number of VHDL source code in many programming examples and analysis, in the hope that useful VHDL enthusiasts. Car DVD Volume 3 includes digital control system, direct digital frequency synthesizer, image edge detector, such as precision digital frequency meter, taxi Accounting System Design and Analysis