Thanks,
1 I used kakadu to view the compressed data(removed the Header), it's the same picture of the input pixel data. Also i import the .jp2 file into the MATLAB. compared with the original pixel data,it is complete and the same datas(lossless). and my picture is 128*100 single compoent ,the total number of input data is 12800.DMA configured as 8-word burst. divided by 32. the answer is integer(400).so i think they are on a burst boundary.
2 following your advice.i tried single transfer DREQ/DACK for the output DMA. The problem is still there.
My decode procedure is continuously decode the compressed data. it means every time the compressed data reaches the last byte,it begin again from the first byte.
So , Is there any problem with the paraments in decode mode?