基于EDA层次出租车计费器实验设计报告.doc

基于EDA的出租车计费器 实 验 设 计 报 告 指导老师： 黄旭 姓名： 陈昊亮 学号： 1228401033 专业： 通信工程 班级： 12通信 日期： 2014.6.10 目 录 一、引言····························································3 二、设计流程 1、实验任务及要求··············································4 2、实验原理····················································4 三、系统设计 1、设计思路·····················································5 2、系统总体模块图···············································5 3、各模块功能实现 十分频模块（PULSE） 1.1十分频模块源程序···································6 1.2十分频模块仿真·····································8 控制模块 (SOUT) 2.1控制模块源程序····································8 2.2控制模块仿真······································10 里程计数模块 (COUNTER2) 3.1里程计数模块源程序································10 3.2里程计数模块仿真··································12 计费模块 (COUNTER) 4.1计费模块源程序····································12 4.2计费模块仿真······································15 （5）顶层模块（ALL） 5.1顶层模块原理图····································16 5.2顶层模块仿真······································17 四、硬件下载实验现象验证 1、系统调试····················································18 2、硬件仿真结果················································19 五、结果分析·······················································19 六、实验总结·······················································19 引言 随着我国国民经济生产总值的增加以及人民生活水平的提高，各大中小城市的出租车营运事业发展迅速，出租车已经成为人们日常出行选择较为普通的交通工具。出租车计费器是出租车营运收费的专用智能化仪表，是使出租车市场规范化、标准化的重要设备。一种功能完备，简单易用，计量准确的出租车计价器是加强出租车行业管理，提高服务质量的必需品。本设计采用VHDL硬件描述语言作为设计手段，采用自顶向下的设计思路，得到一种出租车计价系统的软件结构，通过QuartusⅡ软件下进行软件仿真，再在EDA试验箱进行硬件仿真， 该设计是在VHDL的基础上对出租车计价器进行设计来实现其基本功能的，以往的出租车计价器数字电路、单片机进行的设计数字电路设计的整体电路规模较大，所用的器件较多，造成故障率高，导致计价器不够准确；基于单片机的设计，虽然开发成本降低，但其外围电路较多，而且调试复杂，抗干扰能力差，从而也导致计价器不够准确。FPGA具有稳定性好、抗干扰能力强、电路实现简单、程序简单等优点，且非常适合做为出租车计价器的控制核心，所以选择用VHDL来对计价器进行设计来实现其功能。出租车计价器的实现将大大改善人们出行时因为讨价还价而带来的烦恼，从而使人们的心情比较愉悦。 本设计是对出租车计价器的六个模块进行分析的，综述如下： 十分频模块：该分频模块是其它模块的基础，为后续模块提