368
AMD Geode™ LX Processors Data Book
Display Controller Register Descriptions
33234H
6.6.19.18 Cursor Location Low
6.6.19.19 Vertical Sync Start
6.6.19.20 Vertical Sync End
Index
0Fh
Type
R/W
Reset Value
00h
Cursor Location Low Register Bit Descriptions
Bit
Name
Description
7:0
CURS_LOW
Cursor Location Register Bits [7:0].
Together with the register (CURS_HI, Index
0Eh[7:0]), this value specifies the frame buffer address where the cursor is displayed in
text mode. The cursor will appear at the character whose memory address corresponds
to this value.
Index
10h
Type
R/W
Reset Value
00h
Vertical Sync Start Register Bit Descriptions
Bit
Name
Description
7:0
VERT_SYNC_ST
Vertical Sync Start Register Bits [7:0].
This value specifies the scan line number
where the vertical sync signal will go active. This is a 10-bit value. Bits 9 and 8 are in the
Overflow register (Index 07h[7,2]).
Index
11h
Type
R/W
Reset Value
00h
Vertical Sync End Register Bit Descriptions
Bit
Name
Description
7
WR_PROT
Write-Protect Registers.
This bit is used to prevent old EGA programs from writing
invalid values to the VGA horizontal timing registers. The LINE_COMP8 (Index 07h[4])
is not protected by this bit.
6
RSVD
Not Implemented.
(Refresh Cycle Select)
5
RSVD
Not Implemented.
(Enable Vertical Interrupt)
4
RSVD
Not Implemented.
(Clear Vertical Interrupt)
3:0
V_SYNC_END
Vertical Sync End Register Bits [3:0].
This field represents the low four bits of a com-
pare value that specifies which scan line that the vertical sync signal goes inactive.
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...