说明：  EDA技术从某种意义上说：学习一种通过软件的方法来高效地完成硬件设计的计算机技术__------VHDL文字说明的系统的功能——系统逻辑描述（算法）——图、VHDL语言(用一套计算机能处理的语言来描述设计结果和设计要求)。
(EDA technology from a sense: to learn a software approach to efficiently complete the hardware design of computer technology __------ VHDL text description of the function of the system- the system logical description (algorithm)-- Fig, VHDL language (using a computer can handle the language to describe the design results and design requirements).)