ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 260

• 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

6.4.2.7
GP Memory Offset 10h
Type
Reset Value
When source data is monochrome, the contents of this register are used for expanding pixels that are set in the mono-
chrome bitmap, thus replacing the monochrome bit with a color that is appropriately sized for the destination.
When source data is color, this register contains the color key for transparency. The value(s) in this register is XOR’ed with
the color source data, after which the GP_SRC_COLOR_BG register (GP Memory Offset 14h) is used to mask out bits that
are don’t cares. If all bits of a pixel that are not masked off compare, and source transparency is enabled, then the write of
that pixel will be inhibited and the frame buffer data will be unchanged. Otherwise, the frame buffer will be written with the
color data resulting from the raster operation.
If no source is required for a given BLT, the value of this register is used as the default source data into the raster operation.
This register should only be written after setting the bpp in GP_RASTER_MODE (GP Memory Offset 38h), since the value
written is replicated as necessary to fill the register. Thus a write to this register in 8 bpp-mode takes the least significant
data byte and replicates it in the four bytes of the register. In 16-bpp mode, the least significant two bytes are replicated in
the upper half of the register. A read returns the replicated data.
260
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31:0
Bit
Source Color Foreground (GP_SRC_COLOR_FG)
Name
SRC_FG
R/W
00000000h
33234C
Description
Source Foreground.
Mono source mode: Foreground source color.
Color source mode: Color key for transparency.
GP_SRC_COLOR_FG Bit Descriptions
GP_SRC_COLOR_FG Register Map
SRC _FG
Graphics Processor Register Definitions
AMD Geode™ LX Processors Data Book
9
8
7
6
5
4
3
2
1
0