User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

286

15.4.6.2. UVSCALE—UV Scale Factor Register

Memory Address Offset: 44h (R/W)

On-chip Reg. Mem Addr Offset: 30144h (RO; debug path)

Default Value: 00h

Access: see address offset above

Size: 32 bits

31 20 19 16

Vertical Scale Factor UV Reserved

15 14 3 2 1 0

Reserved Horizontal Scale Factor UV Reserved UV Down Scale Integer

Bit Description

31:20 Vertical Scale Factor UV. Used only in YUV planar modes to set the scale factor for the UV data. This

is different in formats where the UV data is vertically sub-sampled. Bit 31:20 1 > scale ≥ 1/64 (the

maximum vertical up zoom is 64X)

19:15 Reserved.

14:3 Horizontal Scale Factor UV. Used only in YUV modes to set the scale factor for the UV data. This is

different in formats where the UV data is sub-sampled.

2 Reserved.

1:0 UV Down Scale Integer. This field is used only for vertical down scale. It specifies the integer portion

of the scale factor for UV data.