毕业论文：eda技术多功能数字钟系统的设计汇.doc

PAGE  PAGE 41 EDA技术多功能数字钟系统的设计 摘 要 近年来，随着电子技术和通信技术的飞速发展，要求设计研究方面运用电子设计自动化（Electronic Design Automation，简称EDA）工具进行开发。在20世纪90年代初从计算机辅助设计（CAD）、计算机辅助制造（CAM）、计算机辅助测试（CAT）和计算机辅助工程（CAE）的概念发展而来的。EDA技术就是以计算机为工具，设计者在EDA软件平台上，用硬件描述语言HDL完成设计文件，然后由计算机自动地完成逻辑编译、化简、分割、综合、优化、布局、布线和仿真，直至对于特定目标芯片的适配编译、逻辑映射和编程下载等工作。EDA技术的出现，极大地提高了电路设计的效率和可靠性，减轻了设计者的劳动强度。 本设计为通过EDA仿真软件MAX+PLUSII设计一个多功能数字钟，并下载到硬件中实现。本系统的设计电路由计时电路、动态显示电路、闹钟电路、控制电路、显示电路等部分组成。本系统采用动态显示的原理在数码管上显示12小时计时的时刻，具有清零、保持、校时、报时的功能，并在此基础上增加了闹铃、秒表、12小时制计时、A/P显示等功能。在设计过程中，将各部分均模块化，各模块间相互独立，又相互联系。本实验吸收了硬件软件化的思想，大部分功能通过软件来实现，使电路简单明了，系统稳定性大大提高。本系统不仅成功的实现了要求的基本功能,发挥部分也得到完全的实现,而且有一定的创新功能。 关键词 数字钟、计数器、多功能、动态显示、原理图、仿真、模块化 Abstract Recently, with the rapid development of electronic and communication technology, it is required to use Electronic Design Automation (EDA) as a tool in designing systems. EDA derives from the concepts of Computer Aided Design, Computer Aided Manufacture, Computer Aided Test and Computer Aided Engineering in the 1990s. Designers use Hardware Describe Language to accomplish designing files on the platform of software. Then, computer will finish the work of logical compiling, simplification, division, synthesis, optimizing, layout, tracking and simulating automatically, and it can also accomplish the work of proper compiling, logical projecting and downloading of the target chip. As a result, it evidently improves the efficiency and reliability of the circuit design, and it also lighten designer’s workload. This experiment has designed a multifunctional digital clock via using the MAX+PLUSII, and the basic and extended performances and functions are successfully realized in the hardware. This system includes time circuit, alarm circuit, dynamic display circuit, control circuit, display circuit. In the system, the segment display can display time in the 24-hour format, it includes such functions as clear, hold, check