数字电子系统的EDA设计方法研究

Study on EDA Design for Digital Electronic System

介绍基于EDA技术的数字电压表的设计。采用CPLD可编程逻辑器件为系统控制核心，用硬件描述语言决定系统功能，找到硬件不变的情况下更新和扩展程序的方法。在Max4-Plusl／环境下采用VHDL语言实现了数据采集、转换及显示。设计特点为通过软件编程下载到硬件测试，结果表明数字电压表测量和显示电压达到0～5V，精度为0．02V。此种设计方法的数字电子系统具有很强的灵活性。

The design of digital voltmeter based on EDA is illustrated. CPLD as the key control panel, this appliance emphases primacy of the descriptive language over systematic function, so as to make it possible to update and expand the program with the hardware unchanged. Data collection, conversion and display are actualized by relying on VHDL language in Max ＋Plus Ⅱ environment. Tests have been done on the whole range of performance from program download to hardware checking,and the test results prove that the digital voltmeter measuring range is between 0-5 V with measurement accuracy 0.02V. The study concludes that the designed digital electronic system has high flexibility.