CPLD出租车计价器设计.docVIP

基于CPLD的出租车自动计价系统的设计 作者姓名：李 刚刚 专业名称：信息工程 指导教师：大学 讲师 摘 要 随着电子行业的迅猛发展计器在各个领域中的使用越来越频繁用户对计器的要求也越来越高。以出租车多功能计器为例用户不仅要求计器性能稳定计费准确不同国家和地区的收费方式存在差异即使在同一地区不同车型的出租车其收费方式也有差别而且出租车还面临几年一次的调价或调整收费方式等问题。传统的基于单片机设计的出租车多功能计器已远远跟不上这种变化功能升级很繁琐需要硬件重组和软件更新同步进行成本高并且每次升级都可能产新的不稳定因素而基于 (CPLD)的出租车计采用超高速集成电路硬件描述语言VHDL和逻辑综合为基础的自顶向下的电路设计方法, 功能升级十分方便,从使用情况看, 该设计稳定性好、可靠性高, 市场前景良好，而且开发成本低周期短CPLD 超高速集成电路硬件描述语言Abstract Along with the fast fierce development of the electronics profession, charge the machine in each realm of usage is more and more multifarious, the request of customer to the charge machine is also more and more high. To take multi-function charge machine of the rent car as an example, the customer not only request to charge the machine function stability, charge accurate; the for-rent car of different from the charges method existence difference of the region, even in same region, car in different nation type it charges the way but also have the difference, and rent the car to still faces a time fee hikes of several years or adjust to charge the way etc. problem. Traditional according to a machine design of multi-function charge machine of for-rent car has already canned not keep up with this kind of variety far and far, the function upgrade is very tedious, needing the hardware reorganization to carry on with the software renewal synchronously, the cost is high, and upgrade each time may produce the lately unsteady factor; but according to programmable logic array( CPLD) of the spot of multi-function charge machine of for-rent car, the adoption hardware description language the VHDL and logic is comprehensive for basal from the crest get down of the electric circuit design method, Does not change in the hardware electric circuit under the premise, the function upgrade extremely conveniently, looking from the service condition, this design stability good, the reliability is high, the market prospect is good, moreover the development cost is low, the cycle is short, enormous has s