[Mp4-tech] Arranging 4x4 subblock from 8x8 block, for CAVLC in 8x8 xform (H264)

[Rajiv Bajpai]

Hi
  I have got one question regarding formation of 4x4 block from 8x8 transformed block for CAVLC when transform_8x8_flag(supporting of 8x8 transform) is enabled.
  My understanding is:
  It is formed (i=0...15) by taking every 4 positioned coefficients from the zigzag ordered 64 coefficients list of 8x8 block, with starting point at 4x4BlkIdx(0..3) for each 4x4Block within 8x8 block.
  If I am right then what is the advantage of having such type of arrangement? 
  Why is the 4x4 block not formed by splitting the 64 zigzaged coefficients into 4 parts like (0..15)  (16... 31)....?
  Is there any paper on this? 
  Regards,
  Rajiv
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