主DMA模式下PCI总线数据传输的DSP实现

The DSP Implementation of Master DMA Transferring on PCI Bus

研究了基于PCI总线的DMA数据传输系统,着重描述了利用TMS320DM642DSP芯片实现PCI总线DMA数据传输的方法。以DM642作为PCI主设备控制并启动DMA数据传输,给出了主DMA模式下数据传输系统的实现结构及工作流程,并配合内存映射、双缓冲等方法,取得了良好的数据传输性能。

This paper emphasizes a new way of DMA data transferring on PCI bus by TI＇s DSP-TMS320DM642.The structure and flow of the master DMA transfer system is given,which is initiated under DM642 DSP control.The technology in memory mapping and double buffering is also used.Finally,the system gains a good performance in data transferring on PCI bus.