基于DMA传输的并口设计实现

A High Speed Parallel Peripheral Interface Based on DMA Mode

采用改进HARVARD总线结构的通用DSP中,一个可配置位宽的并口采用DMA(直接存储器存取)模式传输。该并口可以实现传输数据的打包解包和奇偶选择,同时支持ITU-R656视频标准的输入传输,对提高DSP的数据吞吐率发挥了重要的作用。

In a general purpose DSP which is based on modified Harvard architecture, a Parallel Peripheral Interface with a reconfigurable bitwidth is designed.The PPI is used with DSP＇s DMA engine.It allows data packing/unpacking to/from 16-bit words and ignores either the odd or the even elements in an input DataStream.Also itsupports three input modes for ITU-R 656-framed data.