ABSTRACT
This article make a simple introduce about the number system hardware design based on the CPLD and the characteristic of VHDL language and it’s the development environment from the develop direction of EDA . Base on correlative standard and theory knowledge, completes the cost system of taxi design with VHDL , which characteristic same with practical ,the max value of distance and fee display is 999.9 (km/￥) And explain design idea and program by compiled. The keystone of task is write and compile charge program and simulate it, it had achieved the result of topic requests.
This system using the VHDL language, the PLD design rental car coststhe system, develops the platform by the MAX+PLUS II softwareachievement, uses MAX+PLUS II to design each function module, the usetext inputs VHDL to design each function module, then takes the partin the top layer design, has designed the rental car fare registersystem program and has carried on the procedure simulation, causes itsrealization to cost as well as the initialization and the simulationautomobile starts, stops, function and so on suspension, and dynamicscanning demonstration fare number, thus realizes a complete hiringfare system. Has demonstrated the hardware description language VHDLdesign numeral logic circuit superiority. Has highlighted it as thehardware description language good readability, the probability and iseasy to understand and so on the merit. This procedure throughdownloads after the specific chip, may apply to the actual rental carcosts in the system.
Key words：The rental car costs the system, the counte, the VHDL language, MAX+PLUS II, EDA
