基于FPGA的多功能计数器的设计.doc

本科毕业论文(设计) 题 目： 基于FPGA的多功能计数器的设计 学 院： 自动化工程学院 专 业： 电子信息科学与技术 姓 名： ############# 指导教师： ############ 2010年 6 月 8 日 基于FPGA的多功能计数器的设计 The Design of Multi-function Counter Based on FPGA 摘 要 本文介绍了一种以大规模可编程逻辑芯片为设计载体，由顶层到底层设计的多功能数字频率计。该频率计采用单片机与频率测量技术相结合，大大提高了测量的精度。本文主要包括该频率计的设计基础和实现方法两部分内容， 描述了它的设计平台、工作原理和软硬件实现。在硬件上，利用Altera公司的FPGA器件为主控器；在软件上，采用VHDL硬件描述语言编程,极大地减少了硬件资源的占用。该数字频率计具有频率测量、周期测量、脉宽测量和占空比测量等多种功能。仿真与分析结果表明，该数字频率计性能优异，软件设计语言灵活，硬件简单，速度快。 关键词 FPGA 等精度 频率计 VHDL Abstract This article introduced one kind as designs the carrier take the large-scale programmable logic chip, the multi-purpose digital frequency meters which designs from the top layer to the first floor. This frequency meter uses the monolithic integrated circuit and the frequency measurement technology unifies, increased the survey precision greatly. This article mainly includes this frequency meter's design basis and realizes the method two partial contents, described its design platform, the principle of work and the software and hardware realizes. On the hardware, uses Altera Corporation's FPGA component is the master controller; On the software, uses the VHDL hardware description language programming, reduced hardware source occupancy enormously. This digital frequency meter has the frequency measurement, the cyclical survey, the pulse width survey and the dutyfactor survey and so on many kinds of functions. The simulation and the analysis result indicated that this digital frequency meter performance is outstanding, the software design language is flexible, the hardware is simple, the speed is quick. Keywords FPGA Equal Precision Measurement Frequency meter VHDL 目 录 第一章 概述 1 1.1 多功能计数器现状 1 1.2 频率测量方法简介 2 第二章 软件开发平台VHDL简介 3 2.1 VHDL的发展 3 2.2 VHDL的特点 3 2.3 VHDL语言结构 4 2.3.1 实体（ENTITY） 4 2.3.2 结构体（ARCHITECTURE） 5 2.4 VHDL软件设计简介