DSP以主模式与主机高速数据交换的实现

High Speed Data Exchange between DSP and Host Computer under DSP′s Master Mode

如何将高速数据采集板采集的数据通过PCI总线高速传输给主机进行显示或处理是设计者很重视的问题。传统的方法采取主机读采集板中数据,但速率往往难以满足要求。本文介绍了在主机主存中分配存储空间,以及DSP以主模式与主机主存进行高速数据交换的方法,数据传输速率达到96MB/s。

While transferring the data sampled by the high speed sampling board to the host computer through PCI bus,the way of transferring the data concerns the speed deeply. Traditionally,we made the host computer read the data storing in the data sampling board,but the speed can＇t satisfy us. This paper explained a means of allocating memory chunks in the main memory of the host computer ,and introduced a method to implement high speed data exchange between DSP and main memory of the host computer under DSP＇s master mode. The speed reached 96 MB/s.