交通信号灯论文...doc

交通信号灯设计论文
学院名称: 信息科学与工程学院
专业: 通信工程
班级: 09-1
姓名: 古丽娜孜
学号: 20081302403
指导教师姓名: 王建英
2011 年 12 月26日
目录
序言····························································3
第一章设计任务和要求·········································4
设计任务····················································4
设计要求····················································4
第二章电路工作原理及方案设计···································5
第三章单元电路设计与仿真·······································6
3. 各模块的原理及其程序·········································6
分频模块的设计及仿真图······································6
计数模块的设计及仿真图
······································8
控制模块的设计及仿真图······································10
······································14
······································15
第四章系统设计·················································17
顶层电路设计················································17
············································19
第五章总结·····················································20
参考文献························································21
附录····························································22
序言
plex Programmable Logic Device)是Complex PLD的简称,一种较PLD为复杂的逻辑元件。CPLD是一种用户根据各自需要而自行构造逻辑功能的数字集成电路。其基本设计方法是借助集成开发软件平台,用原理图、硬件描述语言等方法,生成相应的目标文件,通过下载电缆(“在系统”编程)将代码传送到目标芯片中,实现设计的数字系统。
20世纪70年代,最早的可编程逻辑器件--PLD诞生了。其输出结构是可编程的逻辑宏单元,因为它的硬件结构设计可由软件完成,因而它的设计比纯硬件的数字电路具有很强的灵活性,但其过于简单的结构也使它们只能实现规模较小的电路。为弥补PLD只能设计小规模电路这一缺陷,20世纪80年代中期,推出了复杂可编程逻辑器件--CPLD。目前应用已深入网络、仪器仪表、汽车电子、数控机床、航天测控设备等方面。
它具有编程灵活、集成度高、设计开发周期短、适用范围宽、开发工具先进、设计制造成本低、对设计者的硬件经验要求低、标准产品无需测试、保密性强、价格大众化等特点,可实现较大规模的电路设计,因此被广泛应用于产品的原型设计和产品生产(一般在10,000件以下)之中。几乎所有应用中小规模通用数字集成电路的场合均可应用CPLD器件。CPLD器件已成为电子产品不可缺少的组成部分,它的设计和应用成为电子工程师必备的一种技能。
随着基于CPLD的EDA技术的发展和应用领域的扩大与深入,EDA技术在电子信息、通信、自动控制用计算机等领域的重要性日益突出。作为一个学电子信息专业的学生,我们必须不断地了解更多的新产品信息,这就更加要求我们对EDA有个全面的认识。本程序设计的是交通灯的设计。采用EDA作为开发工具,VHDL语言为硬件描述语言,quartusII作为程序运行平台,所开发的程序通过调试运行、波形仿真验证,初步实现了设计目标
在一个交通繁忙的十字路口,没有交通灯来控制来往车辆和行人的通行,