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388 AMD Geode™ LX Processors Data Book
Video Processor
33234H
6.7 Video Processor
The Video Processor (VP) module provides a high-perfor-
mance, low-power CRT/TFT display or video output inter-
face. There are three main functions contained within the
VP: the Video Processor, the TFT controller, and the video
output port (VOP). The scaling, filtering, and color space
conversion algorithms implemented in the VP are of much
higher quality than those used in software-only video play-
back systems. The VP is capable of delivering high-resolu-
tion and true-color graphics. It can also overlay or blend a
scaled true-color video image on the graphic background.
For video input, integrated scaling, and X and Y interpola-
tion, enable real-time motion video output. The video path
of the VP also contains horizontal and vertical scaling hard-
ware, and an optional YUV-to-RGB color space converter.
This motion video acceleration circuitry is integrated into
the Video Processor to improve video playback. By off-
loading these arithmetic-intensive tasks from the proces-
sor, 30 frame-per-second playback can be easily achieved,
while keeping processor utilization to acceptable perfor-
mance levels. The graphics and video path is illustrated in
Figure 6-23 on page 389.
General Features
• Hardware video acceleration
• Graphics/video overlay and blending
• Progressive video from the Display Controller module
• Dot Clocks up to 350 MHz
Hardware Video Acceleration
• Arbitrary X and Y interpolation using three line-buffers
• YUV-to-RGB color space conversion
• Horizontal filtering and downscaling
• Supports 4:2:2 and 4:2:0 YUV formats and RGB 5:6:5
format
Graphics-Video Overlay and Blending
• Overlay of true-color video up to 24-bpp
• Supports chroma key and color key for both graphics
and video streams
• Supports alpha-blending with up to three alpha windows
that can overlap one another
• 8-bit alpha values with automatic increment or decre-
ment on each frame
• Optional gamma correction for video or graphics
Compatibility
• Supports Microsoft’s Direct Draw/Direct Video and DCI
(Display Controller Interface) v2.0 for full motion video
playback acceleration
• Compatible with VESA, VGA, and DPMS standards for
enhanced display control and power management
6.7.1 Architecture Overview
The Video Processor module contains the following func-
tional blocks. (Figure 6-23 on page 389 shows the relation-
ships between these blocks):
• Video Data Interface
— Video Formatter
—Downscaler
— 5 Line Buffers
— Vertical Upscaler (Programmable up to x8)
— Horizontal Upscaler (Programmable up to x8)
• Control Registers
• Mixer/Blender
— Color Space Converter (CSC)
—Gamma RAM
— Color Keys
— Alpha Blender
• CRT DACs
• TFT Interface
• Video Output Port