基于PXI总线的数字量IO卡设计

A Design of Digital IO Card Based on PXI Bus

为满足航空航天贮箱试验的要求,在传统设备的基础上设计了一种可用于收发422电平和对±2.5 V PCM编解码的数字量IO卡。通过研究PXI总线规范,提出了一种PXI总线接口实现方案。完成了功能电路设计,并着重介绍了±2.5 VPCM编码和解码电路的设计思想。针对硬件平台的特点,增设了板卡的热插拔功能。还重点介绍了WDM驱动程序的设计方法和步骤。详细描述了PCI9054目标传输模式的读写时序。经试验验证,该数字量IO卡达到了预定的设计目标,具有一定的实用性和推广价值。

In order to meet the requirements of the aerospace tank test, A new digital IO card is designed and developed which is used to send and receive 422 level and to codec the ± 2.5 V PCM , on the basis of traditional equipment. Under the premise of studying the PXI bus specification, a kind of PXI interface implementation is pro- posed, the design of the functional circuits are completed, and the ideas of the ± 2.5 V PCM encoding and deco- ding circuits are focused on. For the characteristics of the hardware platform, hot swap function to the card is add- ed. The method and steps of the WDM driver design are put forward, and described the read-write timing of the PCI9054 under its target transmission mode in details. The results of the tests show that the design reaches the pre- determined goals. The technology and methods adopt in the card are nractical and worthy of using abroad.