可实现无间断数据传输的高速光纤链路

基于PCI总线接口实现了一种用于计算机与外设进行数据传输的高速光纤数据传输链路：采用现场可编程门阵列(FPGA)负责实现整个电路的逻辑与时序控制，并能支持DMA方式下的数据收发，开发了适用于链路卡的驱动程序；在应用程序中开辟了两个缓冲区，交替与传输卡上先进先出存储器(FIFO)通信，实现了主机到外设之间高速无间断数据传输；通过改变缓冲区的大小，对此链路的传输性能进行了测试，得到本传输卡的最高链路层带宙曲480Mbit／s。

Design of the Fiber Link for Continuous Data Transmission

Based on PCI bus interface,a data communication card for transmitting data from host computer to peripheral equipment was designed. The field program gate arra y (FPGA) was applied in the interface card to achieve the functions of time and logic control. The data could be transmitted in the DMA mode. The driver control ling communication card was developed. In the design of application software, tw o buffers A and B were used to communicate with the FIFO on the card alternatel y. Thus the high speed continuous data transmission was achieved. Through the t est of the communication performance, the bandwidth of the data link layer is up to 480 Mbit/s.