ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 261

• 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

Graphics Processor Register Definitions
6.4.2.8
GP Memory Offset 14h
Type
Reset Value
When source data is monochrome, the contents of this register are used for expanding pixels that are clear 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 mask for transparency. The value(s) in this register are
inverted and OR’ed with the result of the compare of the source data and the GP_SRC_COLOR_FG register. Thus, a bit
that is clear implies that bit position is a don’t care for transparency, and a bit that is set implies that bit position must match
in both the source data and GP_SRC_COLOR_FG register. If the result of the OR produces all ones for an entire pixel and
transparency is enabled, then the write of that pixel is inhibited and the destination data is unchanged.
This register should only be written after setting the BPP/FMT bits in GP_RASTER_MODE (GP Memory Offset
38h[31:28]), 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 all 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.
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
31:0
Bit
Source Color Background (GP_SRC_COLOR_BG)
Name
SRC_BG
R/W
00000000h
Description
Source Background.
Mono source mode: Background source color.
Color source mode: Color key mask for transparency.
GP_SRC_COLOR_BG Bit Descriptions
GP_SRC_COLOR_BG Register Map
SRC _BG
9
8
33234C
7
6
5
4
3
2
1
261
0