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Workstation 5 System Board Technical Descriptions
TFT LCD and Backlight Interface
The Display Controller (DC)
The DC module is similar to that found in the Geode GX processor line with
additional hardware for graphics filter functions. It consists of a memory
retrieval system (GLIU0), Graphical User Interface (GUI) block, a VGA
interface block, and back-end filter/scaling. The GUI and VGA blocks share a
single display FIFO and display refresh memory interface to the GeodeLink
Memory Controller (GLMC).
The DC module retrieves graphics, video, and overlay streams from the frame
buffer, serializes the streams, performs any necessary color look-ups and
output formatting, and interfaces to the Video Processor for driving the display
device.
Video Processor (VP)
The VP interfaces with the processor core via a GLIU master/slave interface to
provide three main functions, the Video Processor, the TFT controller, and the
Video Output Port (VOP). The VP mixes the graphics and video streams, and
outputs digital RGB data to the TFT Controller.
The TFT Controller converts the digital RGB output of the Video Mixer block
to the digital output suitable for driving a TFT flat panel LCD. The panel
interface supports most SVGA TFT panels and meets the VESA FPDI (Flat
Panel Display Interface) Revision 1 Specification including the correct power
sequencing.
Workstation 5 Field Service Guide
2-13
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