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You can also optionally ignore the second field of an interlaced stream. This can be useful in some applications where data quality or video quality is not as important as the compression that you can achieve by doing this, by using only Field 1 of every frame. You can also skip even or odd data elements, so you can read in only the luma or only the chroma of a 4:2:2 input stream. The whole PPI peripheral works hand in hand with the concept of the 2 dimensional DMA engine that Blackfin has. This allows to specify an arbitrary region of memory and send it out to the PPI without having to worry about parts that you do not want to send out. For example, you can specify an arbitrary rectangular region of an image and send it out the PPI.
PTM Published on: 2006-08-24
Denmark