HW supports dividing the frame into sub-set of 3x3 regions. Following combinations of regions are supported.
- 3 vertical slices
- RW1 = x , RW2 = y and RW3 = z
- 2 vertical slices
- RW1 = x , RW2 = y and RW3 = 0
- Last region width has to be zero
- 1 vertical slice
- RW1 = x , RW2 = 0 and RW3 = 0
- Last two regions width has to be zero
- 3 horizontal slices
- RH1 = x , RH2 = y and RH3 = z
- 2 horizontal slices
- RH1 = x , RH2 = y and RH3 = 0
- Last region height has to be zero
- 1 horizontal slice
- RH1 = x , RH2 = 0 and RH3 = 0
- Last two regions height has to be zero
As shown in Figure 7-94, 2x2 region partitioning can be done by programming RW3=RH3=0.
Note: Region numbering remains as in 3x3 region partitioning with R3, R6-R8 being null regions.