基于VHDL状机设计的智能交通控灯.docVIP

毕 业 论 文（设 计） 论文（设计）题目：基于VHDL状态机设计的智能交通控灯摘 要 实现路口交通灯系统控制的方法很多，可以用标准逻辑器件、可编程序控制器PLC、单片机等方案来实现。但是这些控制方法的功能修改及调试都需要硬件电路的支持，在一定程度上增加了设计难度。采用EDA技术，应用VHDL硬件电路描述语言实现交通灯系统控制器的设计，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，提供模块设计的刨建，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。利用MAX+PLUS集成开发环境进行综合、仿真，并下载到CPLD可编程逻辑器件中，完成系统的控制作用。该灯控制逻辑可实现3种颜色灯的交替点亮、时间的倒计时，指挥车辆和行人安全通行。Abstract A lot of devices, such as standard logic device, PLC(Programmable Logic Controller), single chip microcomputer etc can be used in the design of traffic light system.However，debugging and adjusting the circuits based on these devices require hardware supports.In some sense it complicates the design procedure. In this article, VHDL is applied in designing the system and the logic functions are achieved by CPLD. Electronic design automation (EDA) one of the key technologies. It uses one kind of top-down (top-down) design method, starting from the general requirements of the system, since the content will be designed to gradually refine Shimoji, as divided into several sub-modules, and finally to complete the overall design of the system hardware It supports design libraries and reusable components that generate, support groups designed to provide modular design of the plane built, VHDL design of the programmable application specific integrated circuit (ASIC) development plays a very important role.The code is synthesized simulated and then downloaded into the CPLD by MAX+PLUS Ⅱ.The control logic of the system can change the color of traffic lights alternately and has the function of countdown,thus it can command vehicles and people on the road. Key Words： intelligent traffic light，VHDL，state machine ，CPLD 目 录 1 引言 1 2设计方案 1 2.1状态机简介 1 2.2主体设计 2 3 总体设计结构框图 2 4 仿真结果 4 4.1状态机仿真 4 4.2计数器仿真 5 5总结 5 参考文献： 6 致 谢 7 1 引言 可编程器件的广泛应用，为数字系统的设计带来了极大的灵活性。由于可编程器件可以通过软件编程对硬件的结构和工作方式进行重构，使得硬件的设计可以如同软件设计那样快捷方便。由于高速发展的FPGA/CPLD兼有串、并行工作方式和高速、高可靠性的特点，在电子系统