ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 331
ALXD800EEXJ2VD
Manufacturer Part Number
ALXD800EEXJ2VD
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.ALXD800EEXJ2VD.pdf
(675 pages)
Specifications of ALXD800EEXJ2VD
Operating Temperature (min)
0C
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
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Display Controller Register Descriptions
6.6.6.2
DC Memory Offset 064h
Type
Reset Value
This register contains the Y position information of the hardware cursor.
Settings written to this register will not take effect until the start of the following frame or interlaced field.
6.6.6.3
DC Memory Offset 06Ch
Type
Reset Value
This register contains status information for the current display state, including the current scan line for the display
(V_LINE_CNT). This portion of the register is read only and is used by software to time update the frame buffer to avoid
tearing artifacts. This scan line value is driven directly off of the Dot clock, and consequently it is not synchronized with the
CPU clock. Software should read this register twice and compare the result to ensure that the value is not transitioning.
Several additional read only display status bits are provided to allow software to properly time the programming of registers
and to detect the source of display generated interrupts.
AMD Geode™ LX Processors Data Book
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31:17
16:11
10:0
Bit
DC Cursor Y Position (DC_CURSOR_Y)
DC Line Count/Status (DC_LINE_CNT/STATUS)
Name
RSVD
Y_OFFSET
CURSOR_Y
R/W
xxxxxxxxh
RO
xxxxxxxxh
RSVD
Description
Reserved.
Y Offset. This field represents the Y line offset within the 64x64 cursor pattern at which
the displayed portion of the cursor is to begin. Normally, this value is set to zero to dis-
play the entire cursor pattern, but for cursors for which the “hot spot” is not at the top
edge of the pattern, it may be necessary to display the bottom-most lines of the cursor
only as the cursor moves close to the top edge of the display. Note that if this value is
non-zero, the DC_CURS_ST_OFFSET (DC Memory Offset 018h) must be set to point to
the first cursor line to be displayed.
Cursor Y. This field represents the Y coordinate of the line at which the upper left corner
of the cursor is to be displayed. This value is referenced to the screen origin (0,0), which
is the pixel in the upper left corner of the screen.
V_LINE_CNT
DC_LINE_CNT/STATUS Register Map
DC_CURSOR_Y Bit Descriptions
DC_CURSOR_Y Register Map
Y_OFFSET
RSVD
9
9
8
8
33234C
7
7
DOT_LINE_CNT
CURSOR_Y
6
6
5
5
4
4
3
3
2
2
1
1
331
0
0
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