Справочник Пользователя для AMD LX 800@0.9W
AMD Geode™ LX Processors Data Book
17
Architecture Overview
33234H
2.5
Graphics Processor
The Graphics Processor is based on the graphics proces-
sor used in the AMD Geode GX processor with several fea-
tures 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 transpar-
ency, 256 ternary raster operations, alpha blenders to sup-
port 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:
sor used in the AMD Geode GX processor with several fea-
tures 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 transpar-
ency, 256 ternary raster operations, alpha blenders to sup-
port 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
• Paletized color
• Full 8x8 color pattern buffer
• Channel 3 - third DMA channel
• Monochrome inversion
Table 2-1 presents a comparison between the Graphics
Processor features of the AMD Geode GX and LX proces-
sors.
Processor features of the AMD Geode GX and LX proces-
sors.
Table 2-1. Graphics Processor Feature Comparison
Feature
AMD Geode™ GX Processor
AMD Geode™ LX Processor
Color Depth
8, 16, 32 bpp
8, 16, 32 bpp (A) RGB 4 and 8-bit indexed
ROPs
256 (src, dest, pattern)
256 (2-src, dest and pattern)
BLT Buffers
FIFOs in Graphics Processor
FIFOs in Graphics Processor
BLT Splitting
Managed by hardware
Managed by hardware
Video Synchronized BLT/Vector
Throttle by VBLANK
Throttle by VBLANK
Bresenham Lines
Yes
Yes
Patterned (stippled) Lines
No
Yes
Screen to Screen BLT
Yes
Yes
Screen to Screen BLT with
mono expansion
mono expansion
Yes
Yes
Memory to Screen BLT
Yes (through CPU writes)
Yes (throttled rep movs writes)
Accelerated Text
No
No
Pattern Size (Mono)
8x8 pixels
8x8 pixels
Pattern Size (Color)
8x1 (32 pixels)
8x8 pixels
8x2 (16 pixels)
8x4 (8 pixels)
Monochrome Pattern
Yes
Yes (with inversion)
Dithered Pattern (4 color)
No
No
Color Pattern
8, 16, 32 bpp
8, 16, 32 bpp
Transparent Pattern
Monochrome
Monochrome
Solid Fill
Yes
Yes
Pattern Fill
Yes
Yes
Transparent Source
Monochrome
Monochrome
Color Key Source Transparency
Y with mask
Y with mask
Variable Source Stride
Yes
Yes
Variable Destination Stride
Yes
Yes
Destination Write Bursting
Yes
Yes
Selectable BLT Direction
Vertical and Horizontal
Vertical and Horizontal
Alpha BLT
Yes (constant
α or α/pix)
Yes (constant
α, α/pix, or sep. α channel)
VGA Support
Decodes VGA Register
Decodes VGA Register
Pipeline Depth
2 ops
Unlimited
Accelerated Rotation BLT
No
8, 16, 32 bpp
Color Depth Conversion
No
5:6:5, 1:5:5:5, 4:4:4:4, 8:8:8:8