424
AMD Geode™ LX Processors Data Book
Video Processor Register Descriptions
33234H
6.8.3.3
Video X Position (VX)
2
VSYNC_EN
CRT Vertical Sync Enable.
Enables/disables CRT vertical sync (used for VESA DPMS
support).
0: Disable.
1: Enable.
1
HSYNC_EN
CRT Horizontal Sync Enable.
Enables/disables CRT horizontal sync (used for VESA
DPMS support).
0: Disable.
1: Enable.
0
CRT_EN
CRT Enable.
Enables the graphics display control logic. This bit is also used to reset the
display logic.
0: Reset display control logic.
1: Enable display control logic.
VP Memory Offset 010h
Type
R/W
Reset Value
00000000_00000000h
DCFG Bit Descriptions (Continued)
Bit
Name
Description
VX Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
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
VID_X_END
RSVD
VID_X_START
VX Bit Descriptions
Bit
Name
Description
63:28
RSVD (RO)
Reserved (Read Only).
Reads back as 0.
27:16
VID_X_END
Video X End Position.
Represents the horizontal end position of the video window. This
register is programmed relative to CRT horizontal sync input (not the physical screen
position). This value is calculated according to the following formula:
Value = Desired screen po (H_TOTAL – H_SYNC_END) – 13. (Note 1)
15:12
RSVD (RO)
Reserved (Read Only).
Reads back as 0.
11:0
VID_X_START
Video X Start Position.
Represents the horizontal start position of the video window.
This value is calculated according to the following formula:
Value = Desired screen po (H_TOTAL – H_SYNC_END) – 14. (Note 1)
Note 1. H_TOTAL and H_SYNC_END are the values written in the Display Controller module registers.
Summary of Contents for Geode LX 600
Page 14: ...14 AMD Geode LX Processors Data Book Overview 33234H...
Page 20: ...20 AMD Geode LX Processors Data Book Architecture Overview 33234H...
Page 44: ...44 AMD Geode LX Processors Data Book Signal Definitions 33234H...
Page 88: ...88 AMD Geode LX Processors Data Book GLIU Register Descriptions 33234H...
Page 618: ...618 AMD Geode LX Processors Data Book Electrical Specifications 33234H...