基础VHDL学习,掌握VHDL程序的结构和熟悉QuartusⅡ的VHDL文本设计流程全过程，学习简单祝贺电路的设计、多层次电路设计、仿真和硬件测试。-VHDL based learning, to master the structure of VHDL procedures and familiar with the Quartus Ⅱ of the VHDL design flow the text the whole process of learning a simple congrat