【正文】 troduces 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 plete 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 (., 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 topdown design method, namely from the overall system requirements, from top to down gradually to refine design content, such as divided into sub modules, finally pleted the overall design of the system hardware. It supports design library and reusable ponents to generate, support the class design, module design creation. VHDL design technology of programmable applicationspecific integrated circuit (ASIC) plays a very important role in the development. 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計(jì)（論文） 基于 VHDL 交通燈系統(tǒng)的設(shè)計(jì) iii 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, optimizing circuit design, we can use smaller programmable logic chip, thereby reducing system cost. Keywords: traffic light 、 VHDL、 simulation 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計(jì)（論文） 基于 VHDL 交通燈系統(tǒng)的設(shè)計(jì) iv 目錄 前言 ................................................................................................................................ 1 第一章 軟件的介紹 ...................................................................................................... 3 VHDL 系統(tǒng)語言特點(diǎn) ....................................................................................... 3 VHDL 系統(tǒng)語言程序特點(diǎn) ............................................................................... 4 VHDL 系統(tǒng)語言基本邏輯指令 ....................................................................... 5 VHDL 系統(tǒng)語言基本運(yùn)算符及基本數(shù)據(jù)類型 ............................................... 5 第二章 MAX+PLUAⅡ的簡介 .................................................................................... 6 MAX+PLUAⅡ的定義 .................................................................................. 6 Max+plusⅡ開發(fā)系統(tǒng)的特點(diǎn) ....................................................................... 6 交通燈軟件部分 ............................................................................................... 8 第三章 CPLD 的介紹 ................................................................................................ 15 簡介 ..................................................................................................... 15 發(fā)展 動態(tài) 及應(yīng)用 ................................................................................. 15 的特點(diǎn) .................................................................................................. 15 如何使用 ........................................................................................................ 15 FPGA 與 CPLD 的辨別和分類 .................................................................. 16 第四章 設(shè)計(jì)流程和硬件介紹 .................................................................................... 18 設(shè)計(jì)要求 ......................................................................................................... 18 交通燈系統(tǒng)基本原理圖 ................................................................................. 18 系統(tǒng)硬件模塊及功能介紹 ............................................................................. 18 時(shí)鐘模塊 ............................................................................................... 18 輸入模塊 ............................................................................................... 19