基于CPLD的坐标参量采集卡的设计和实现

Design and Accomplishment of Coordinate Collecting Device based on CPLD

坐标参量采集卡是一种用于采集全数字摄影测量系统地面影像模型坐标位移量及坐标的专用设备,该设备采用CPLD和VHDL语言实现增量式旋转编码器的脉冲信号鉴相、脉冲计数、设备状态控制以及和PCI总线芯片CH365之间的数据交换和通信功能,具有实时性强、工作稳定、通用性较好和性价比高等特点,本文主要介绍了这种设备的硬件和接口程序设计,并对设计中的相关问题进行了探讨。

The coordinate collecting device is a kind of specific device which is used to collect the corrdinate and corrdinate displacement of ground image＇ s three-dimensional model created by full digital photogrammetric station. CPLD chip and VHDL are applied in this device to carry out the following work： phase control of the electrical pulse created by incremental rotary encoder, counting the number of electrical pulse, controling the state of signal processing circuit, exchanging data between this circuit and PCI control chip（CH365）. There are some feature shown in the working procedure of the device, for example： good realime,steady work, better universality and high ratio of performance to cost. In this thesis, we introduce how to design this device＇ s hardware and interface programme. At the same time we inquire into some subjects arised in the design procedure.