ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 339

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Display Controller Register Descriptions
6.6.10
6.6.10.1 DC Graphics Filter Scale (DC_GFX_SCALE)
DC Memory Offset 090h
Type
Reset Value
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
31:16
15:0
Bit
Graphics Scaling Control Registers
Name
V_SCALE
H_SCALE
R/W
40004000h
V_SCALE
Description
Vertical Filter Scale. The value in this field, represents the number of vertical lines of
source data that are consumed for every line of filtered data produced by the scaler filter.
This field is treated as a rational number, with the decimal point between bits 30 and 29.
To determine the value to be programmed into this field, use the following formula:
V_SCALE = (V_SOURCE / (V_DEST-1)) << 14
Where V_SOURCE is the height (in scan lines) of the frame buffer and V_DEST is the
height (in scan lines) of the destination field.
The default value of this field (4000h) represents 1:1 scaling. This value must be pro-
grammed when the vertical filter is disabled.
The value in this field must not exceed 8000h, which represents a 2:1 downscale ratio. If
the width of the source image is more than 1024 pixels, scaling is not supported.
Horizontal Filter Scale. The value in this field, represents the number of (horizontal) pix-
els of source data that are consumed for every pixel of data produced by the scaler filter.
This field is treated as a rational number, with the decimal point between bits 14 and 13.
To determine the value to be programmed into this field, use the following formula:
H_SCALE = (H_SOURCE/(H_DEST-1)) << 14
Where H_SOURCE is the width (in pixels) of the frame buffer and H_DEST is the width
(in pixels) of the destination image.
The default value of this field (4000h) represents 1:1 scaling. This value must be pro-
grammed when the horizontal filter is disabled.
The value in this field must never exceed 8000h, which represents a 2:1 horizontal down-
scale. If the width of the source image is greater than 1024 pixels, scaling is not sup-
ported.
DC_GFX_SCALE Bit Descriptions
DC_GFX_SCALE Register Map
9
H_SCALE
8
33234C
7
6
5
4
3
2
1
339
0