Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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15.4.3.2.
UV_VPH—UV Vertical Phase Register
Memory Address Offset:
20h (R/W)
On-chip Reg. Mem Addr Offset:
30120h (RO; debug path)
Default Value:
00h
Access:
see address offset above
Size:
32 bits
31
20 19
16 15
4 3
0
UV Vertical Phase 1
Reserved
UV Vertical Phase 0
Reserved
Bit Description
31:20
UV Vertical Phase 1. This fractional value is only used in YUV planar formats where the UV plane
may have a different vertical initial phase from the Y data. This field is used with Buffer 1 in frame
mode or Field 1 in field mode.
may have a different vertical initial phase from the Y data. This field is used with Buffer 1 in frame
mode or Field 1 in field mode.
19:16
Reserved.
15:4
UV Vertical Phase 0. This fractional value is only used in YUV planar formats where the UV plane
may have a different vertical initial phase from the Y data. This field is used with Buffer 0 in frame
mode or Field 0 in field mode.
may have a different vertical initial phase from the Y data. This field is used with Buffer 0 in frame
mode or Field 0 in field mode.
3:0
Reserved.
15.4.3.3.
HORZ_PH—Horizontal Phase Register
Memory Address Offset:
24h (R/W)
On-chip Reg. Mem Addr Offset:
30124h (RO; debug path)
Default Value:
00h
Access:
see address offset above
Size:
32 bits
31
20 19
16 15
4 3
0
UV Horizontal Phase
Reserved
Y/RGB Horizontal
Phase
Reserved
Bit Description
31:20
UV Horizontal Phase. Sets the initial horizontal phase for the UV data. Only used in YUV modes.
19:16
Reserved.
15:4
Y/RGB Horizontal Phase. Sets the initial horizontal phase for both buffers/fields. Unlike the vertical
initial phases, this does not change buffer to buffer or field to field. YUV modes use a separate initial
phase for Y and UV data. This value will either be the actual initial phase or the initial phase minus
one.
initial phases, this does not change buffer to buffer or field to field. YUV modes use a separate initial
phase for Y and UV data. This value will either be the actual initial phase or the initial phase minus
one.
3:0
Reserved.