基于cpld的多功能脉冲分配器的设计毕设论文.doc

毕业设计说明书 基于CPLD的多功能脉冲分配器的设计 专业 电子信息工程 学生姓名 韩 清 班级 B电子032班 学号 0310620206 指导教师 成 开 友 完成日期 2007年6月14日 基于CPLD的多功能脉冲分配器的设计 摘 要 现代经济快速发展，步进电机作为能够精确步进定位的器件，被广泛应用于不同的行业中。但是步进电机自身不能控制运行，需要借助步进电机控制器来控制。而脉冲分配器作为步进电机控制器中的核心设备，将直接控制步进电机的运转方式和运转速度。 设计的脉冲分配器能实现多种功能。通过模式键切换，实现步进电机分三相六拍和双三拍两种模式工作；根据复位键的高低电平，决定步进电机是否运转；有方向控制选择键，实现对步进电机的正、反方向运转的控制；并且具有分频功能，可以将输入频率生成八种不同频率输出来控制步进电机的转速。对脉冲分配器的设计以XILINX公司的XC9572 CPLD芯片为硬件主体和超高速集成电路硬件描述语言VHDL为软件主体。这种设计方法具有设计简单、代码通用、系统灵活性和可靠性强的优势。文中详细介绍了脉冲分配器中XC9572 CPLD芯片、分频器和状态机的设计细节。 由于是基于可编程逻辑器件并结合VHDL语言设计的步进电机脉冲分配器，因此其突出的优点就是有良好的升级特性，能很好地提高产品的竞争优势。 关键词: 步进电机；脉冲分配器；VHDL；CPLD The design of Multifunctional Pulse Distributor based on CPLD Abstract With the rapid development of modern economy, stepper motor, as a device which can precisely positioning, is widely used in various industries. However, stepper motor can not control operation itself, thus stepper motor controller is needed. Meanwhile, the pulse distributor, as the core equipment of stepper motor controller, will be in direct control of the stepper motor operation and the operation of speed. The pulse distributor is designed to carry out its various functions, among which are: by key mode switching, two modes of six hours of three-phase and three-bats can be shoot; according to the high or low level of the electricity of the reset button, whether stepper motor is in operation can be decided; the control of the all-direction operation of stepper motor can be carried out by the direction control keys; moreover, this pulse distributor has the function of frequency-distribution, it can control the speed of the stepper motor by transferring the input frequency into eight different output frequencies. The design of this pulse distributor employs XC9572 CPLD chip which produced by XILINX company as its main hardware and VHDL as its main software. This method is simple in design, with a common code, a flexible system and has advantages in its reliabilit