基于PCI Express总线的数据传输卡的设计与实现

本文介绍了SAR回波实时记录系统中基于PCI Express(以下简称PCIE)总线的数据传输卡的设计和实现.SAR回波实时记录系统以普通的基于PCIE总线架构的PC为开发平台,系统实现的关键技术之一是实时地接收回波数据.PCIE数据传输卡实现将SAR回波数据实时地传送到PC的内存共享缓冲区中,数据传输采用DMA方式.采用PLX公司的接口芯片PEX8311来实现PCIE总线的接口逻辑.利用PCIE数据传输卡上2片FIFO数据缓冲区的乒乓切换和PC机内存共享缓冲区的环行存储技术保证了数据的连续接收.PCIE数据传输卡工作状态稳定,读写速度可达到180 MB/s,保证了数据传输的连续性和数据的完整性.

Design and implementation of data transfer card based on PCI Express bus

The design and implementation of data transfer card based on PCI Express bus(Abbreviated for PCIE)in real-time SAR echo data recording system is introduced.The system uses common PC computer equipped with PCIE bus as development platform.Receiving echo data in real time is the key technology of system implementation.The PCIE card transfers SAR echo data to the shared buffer in the PC's memory in real-time and data transfer mode is DMA.Interface chip PEX8311 of PLX Co.implements interface logic for the PCIE data transfer card.Ping-pang switching of two FIFO used for data buffer on the PCIE data transfer card and serial storage technique of shared buffer in the PC's memory guarantee continuous data receiving.The PCIE transfer card works stably and the read and write speed can reach 180MB/s,which ensure continuous data receiving as well as the integrality of the data.