基于VHD出租车计费器研究设计书作业.docVIP

基于VHDL的出租车计费器设计 摘 要 近年来，随着人们生活水平的提高，出租车已经成为人们出行必不可少的交通工具之一。而出租车计费器是出租车上的一个重要仪器，它是乘客与司机双方的公平交易准则。在出租车的需求量不断加大的情况下，对出租车计费器系统的稳定性，灵活性的要求增加，具有良好性能的计费器对于司机和乘客都是很有必要的。本文设计了一个基于VHDL的出租车计费器系统，该系统分为计费和显示两大模块。计费模块是实现系统功能的核心，根据输入信号，将里程、计费和等候时间以BCD码形式显示出来，显示模块将其译码轮流扫描显示。本设计首先在QuartusⅡ软件中，用VHDL语言对各个模块进行设计，其次画出顶层原理图，然后对顶层文件进行仿真测试，最后将仿真成功的设计文件下载到EDA实验箱进行验证。验证结果具有计时、计里程、计费等功能。 关键词：出租车计费器；VHDL；Quartus Ⅱ；设计 Design of Taximeter Based on VHDL Abstract With the development of peoples living standard, taxi has become an important transportation in recent years. And taxi meter is an important instrument in taxi, it is the fair trade standards in both passengers and drivers. In the situation that the demand of taxi is increasing continuously and the requirements of taxi meter systems stability and flexibility are increase, the taxi meter which have a good performance is very necessary for drivers and passengers. This paper designs a taxi meter based on VHDL, the taxi meter system is divided into two modules: charge control and display control. The charge control module is the core to realize the function of the system, according to the input signal, display the mileage, charge and waiting time by BCD code. The display module will be scan and display decoding alternately. Firstly, using VHDL language compile the various parts in Quartus Ⅱ software, and draw the top diagram. Then the simulation test. Finally, the success of simulation program will be downloaded into the EDA experiment box. The validation result comply with the design requirements, there are many functions, as record the time, mileage and charge. Key woords: taximeter; VHDL; Quartus Ⅱ; design 目 录 中文摘要 Ⅰ 英文摘要 Ⅱ 1 引言 1 1.1 设计背景 1 1.2 VHDL简介 1 1.3 QuartusⅡ简介 3 2 出租车计费器的设计 3 2.1 系统设计要求 3 2.2 设计思路 4 2.3 出租车计费器系统工作流程图 4 3 出租车计费器的实现 5 3.1 出租车计费器的顶层原理图 5 3.2 系统各功能模块的实现 5 3.2.1 模块taxi:charge_control 6 3.2.2 模块display:display_control 6 4 出租车计费器系统仿真及分析 7 4.1 顶层实体的仿真波形 7 4.2 计费模块的仿真波形 8 4.3 显示模块的仿真波形