2 dc vbi odd control (dc_vbi_odd_ctl), 3 dc vbi horizontal control (dc_vbi_hor), 0a4h – AMD Geode LX [email protected] User Manual
Page 345: Dc vbi odd control (dc_vbi_odd_ctl), Xxxxxxxxh, 0a8h, Dc vbi horizontal control (dc_vbi_hor)
AMD Geode™ LX Processors Data Book
345
Display Controller Register Descriptions
33234H
6.6.11.2 DC VBI Odd Control (DC_VBI_ODD_CTL)
Settings written to this register do not take effect until the start of the following frame or interlaced field.
6.6.11.3 DC VBI Horizontal Control (DC_VBI_HOR)
Settings written to this register do not take effect until the start of the following frame or interlaced field.
28
VBI_ENA
VBI Enable. Setting this bit to 1 enables VBI (Vertical Blank Interrupt) data. This is a data
stream that is placed in the off-screen region at the start of each field. This data is passed
through the graphics output path, but is not filtered or modified in any way.
27:0
VBI_EVEN_
OFFSET
VBI Even Address Offset. Indicates the starting offset for VBI data for even fields. This
address must be QWORD aligned; the low three bits are always 0. If interlacing is dis-
abled, this offset is used for VBI data.
DC Memory Offset 0A4h
Type
R/W
Reset Value
xxxxxxxxh
DC_VBI_EVEN_CTL Bit Descriptions (Continued)
Bit
Name
Description
DC_VBI_ODD_CTL Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RSVD
VBI_ODD_OFFSET
0
DC_VBI_ODD_CTL Bit Descriptions
Bit
Name
Description
31:28
RSVD
Reserved. Set to 0.
27:0
VBI_ODD_
OFFSET
VBI Odd Address Offset. Indicates the starting offset for VBI data for odd fields. This
address must be QWORD aligned; the low three bits are always 0. If interlacing is dis-
abled, the even offset is used for VBI data.
DC Memory Offset 0A8h
Type
R/W
Reset Value
xxxxxxxxh
DC_VBI_HOR Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RSVD
VBI_H_END
RSVD
VBI_H_START
DC_VBI_HOR Bit Descriptions
Bit
Name
Description
31:28
RSVD
Reserved. Set to 0.
27:16
VBI_H_END
VBI Horizontal End. Specifies the horizontal end position for VBI data minus 1 pixel.
15:12
RSVD
Reserved. Set to 0.
11:0
VBI_H_START
VBI Horizontal Start. Specifies the horizontal start position for VBI data minus 1 pixel.