毕业设计（论文）报告
题 目 基于VHDL交通灯系统的设计
系 别 专 业 班 级 学生姓名 学 号
指导教师
2013年 4 月
基于VHDL的交通灯系统设计
摘要：当今时代是一个自动化时代，交通灯控制等很多行业的设备都与计算机
密切相关。因此，一个好的交通灯控制系统，将给道路拥挤、违章控制等方面给予技术革新。随着大规模集成电路及计算机技术的迅速发展，以及人工智能在控制技术方面的广泛运用，智能设备有了很大的发展，是现代科技发展的主流方向。本文介绍了一个交通灯系统的设计，模拟实现了红、绿灯指挥交通的功能。
传统的交通灯控制系统多数由单片机或PLC实现，本文介绍的是基于EDA技术设计交通灯系统的一种方案。EDA技术的一个重要特征就是使用硬件描述语言(HDL)来完成系统的设计文件，应用VHDL的数字电路实验降低了数字系统的设计难度,这在电子设计领域已得到设计者的广泛采用。本设计就是针对交通信号灯控制器的设计问题，提出了基于VHDL语言的交通信号灯系统的硬件实现方法。
VHDL(即超高速集成电路硬件描述语言)是随着可编程逻辑器件(PLD)的发展而发展起来的一种硬件描述语言，主要用于描述数字系统的结构、行为、功能和接口，是电子设计自动化(EDA)的关键技术之一。它采用一种自上而下(top-down)的设计方法，即从系统总体要求出发，自上至下地逐步将设计内容细化，如划分为若干子模块，最后完成系统硬件的整体设计。它支持设计库和可重复使用的元件生成，支持阶层设计，提供模块设计的创建。VHDL设计技术对可编程专用集成电路(ASIC)的发展起着极为重要的作用。
通过对系统进行结构分析，采用了层次化的设计方法，给出了各个模块的VHDL程序，并且利用Max PlusⅡ对应用程序进行了仿真，并给出了相应的仿真结果。在用VHDL语言进行电路设计时,应充分认识到VHDL语言的特点,从设计思想、语句运用及描述方法上等多方面对电路进行优化设计。通过电路优化设计,可以使用规模更小的可编程逻辑芯片,从而降低系统成本。
关键词：交通信号灯、VHDL、仿真
The system design of traffic lights based on VHDL
Abstract：The modern age is an era of automation, traffic light control equipment
for many industries are closely related with the computer. Therefore, a good traffic light control system, will bring technical innovations for road congestion, illegal control, etc. With the rapid development of large scale integrated circuits and computer technology and the extensive use of intelligent devices in the control of artificial intelligence technology, intelligent devices have gotten great progress and become the mainstream of the development of modern science . This paper describes the system design of traffic lights ,Simulation realized the function of red, green light directing traffic.
Traditional traffic light control system is mostly achieved by a single chip or PLC, this paper introduces a scheme of the design of traffic signal systems based on EDA technology . An important feature of EDA technology is the use of hardware description language (HDL) to complete the system design documents, the experiment applied VHDL digital circuit reduces the difficulty of digital system design, which has been widely adopted by the designers of electronic area. This design puts forward a method of hardware implementation for traffic lights system based on VHDL language to resolve the design problem of traffic signal controller .
VHDL (i.e., ultra high speed integrated circuit hardware description language) is with the development of programmable logic devices (PLD) and developed a kind of hardware description language, is mainly used to describe the structure of the digital system, behavior, function and interface of electronic design automation (EDA) is one of the key technologies. (top - down) it USES a top-down design method, namely from the overall system requirements, from top to down gradually to refine design content, such as divided into sub modules, finally completed the overall design of the system hardware. It supports design library and reusable components to generate, support the class design, module design creation. VHDL design technology of programmable application-specific integrated circuit (ASIC) plays a very important role in the development.
Each module is given VHDL program by analyzing the structure of the system and using a hierarchical design method, and it applies Max Plus Ⅱ on the simulation of applications , and the corresponding simulation results are gained. When design the circuit with VHDL, we should be fully aware of the characteristics of VHDL language and optimize the circuit design from the design, the use of statements and methods of description,etc.Through optimizing circuit design, we can use smaller programmable logic chip, thereby reducing system cost.
Keywords: traffic light 、VHDL、simulation
基于VHDL交通灯系统的设计 - 图文
