AMD Geode LX 800@0.9W - Manual (Page 237)

AMD Geode™ LX Processors Data Book 237
Graphics Processor 33234H
6.3 Graphics Processor
The Graphics Processor is based on the graphics proces-
sor used in the AMD Geode™ GX processor with several
features added to enhance performance and functionality.
Like its predecessor, the AMD Geode LX processor’s
Graphics Processor is a BitBLT/vector engine that supports
pattern generation, source expansion, pattern/source
transparency, 256 ternary raster operations, alpha blenders
to support alpha-BLTs, incorporated BLT FIFOs, a
GeodeLink™ interface and the ability to throttle BLTs
according to video timing. Features added to the Graphics
Processor include:
• Command buffer interface
• Hardware accelerated rotation BLTs
• Color depth conversion
• Palletized color
• Full 8x8 color pattern buffer
• Channel 3 - third DMA channel
• Monochrome inversion
The block diagram of the AMD Geode LX processor’s
Graphics Processor is shown in Figure 6-10. Table 6-7 on
page 238 presents a comparison between the Graphics
Processor features of the AMD Geode GX and LX proces-
sors.
Figure 6-10. Graphics Processor Block Diagram
Pattern
Registers
Pattern
Expansion
Raster
Source
Aligner &
Expansion
Operation
Source &
Destination
Read FIFOs
Alpha
Blend
Unit
Write
Accumulation
FIFO
GeodeLink™ Interface Unit 0
(GLIU0)
Channel 3
Data Flow
Control
Channel 3
Data
Formatter
2K FIFO
and
LUT and
Pattern
Memory
Channel 3
Fetch
Engine
Command
Buffer Control
Logic and
Registers