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WS4 LX Technical Overview
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.
Functions such as video scaling, filtering, and color space conversion are performed in
hardware to provide higher quality video playback than that found in software only
systems. Off-loading these arithmetic-intensive tasks from the processor allows
30-frame per second video playback to be easily achieved.
Figure 4-6 displays a block diagram of the TFT and Backlight Interfaces as
implemented on the WS4 LX System Board.
Figure 4-6: WS4 LX System Board TFT LCD and Backlight Interface
Workstation 4 and 4 LX Field Service Guide
4-13
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Troubleshooting
