User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

212

DWord Bits Description

2 31:26 Reserved: 00h

25:16 Horizontal Origin: An unsigned integer specifying both the upper-left pixel of the

destination block and the origin of the motion vectors in the reference frame(s). This

value must be a multiple of the width. The valid range is 0 – 1023.

15:10 Reserved: 00h

9:0 Vertical Origin: An unsigned integer specifying both the upper-left pixel of the

destination block and the origin of the motion vectors in the reference frame(s). This

value must be a multiple of the height. The valid range is 0 – 1023.

3 31:26 Reserved: 00h

25:16 Height: An unsigned integer specifying the height of the destination block and the

source block(s), if required. The valid values for this field are dependant on the

Block Pattern Format as follows:

Disabled Valid range: 1 – 1023 (used for skipped macroblocks)

Single Valid values are 2,4,8

Halves Valid values are 2,4,8

Quadrants Valid values are 4,8,16

15:10 Reserved: 00h

9:0 Width: An unsigned integer specifying the width of the destination block and the

source block(s), if required. The valid values for this field are dependant on the

Block Pattern Format as follows:

Disabled Valid range: 1 – 1023 (used for skipped macroblocks)

Single Valid values are 2,4,8

Halves Valid values are 4,8,16

Quadrants Valid values are 4,8,16

4 31:0 Forward Motion Vector (see the Motion Vector Format below)

5 31:0 Backward Motion Vector (see the Motion Vector Format below)

6 – … N/A Block Intra-coded/Correction Data: Each double word (32 bits) contains packed

8-bit data or 16-bit data depending on the Prediction Type:

Intra-coded Block Four 8-bit values packed in 32 bits. The least significant byte

contains data for the left most pixel, spatially.

Predicted Block Two 16-bit values packed in 32 bits. The least significant

word contains data for the left most pixel, spatially.

N/A …