基于FPGA和PCI的高精度测速板卡的设计与实现

Design and Implementation of High Accuracy Tachometer Card Based on FPGA and PCI

经典的码盘数字测速方法有M法、T法、M/T法,但都有一定的不足。为了克服原有方法的不足,设计并实现了一种在较大速度范围都有良好精度和良好快速性的测速方法。电路采用FPGA实现,测速得到的数据通过PCI总线从设备控制器实现与控制计算机通信。从而根据实际传输的需要,简化了PCI从设备控制器,实现了PCI总线I/O普通读与猝发读数据的功能。

The classical digital tachometer methods contain M method,T method and M/T method,which have some disadvantages.An enhanced method,which has higher accuracy and better rapidity in large velocity range is designed and implemented to overcome the disadvantages of these methods.The electric circuit is achieved by FPGA,and the data of tachometer communicates with the control computer by PCI-slave device controller.According to the actual requirement,the PCI device controller implements the function of I/O operation which includes ordinary read and burst read.