Table of Contents
Advertisement
12.1.6 V-PORT
The V-Port provides a dedicated video path to the display memory. It is intended to support
either a source of live video incoming from an external video source or a MPEG play back
from the onboard MPEG decoder.
§
Characteristics
The interface supports AccuPack or compressed YUV color space format when
bandwidth of display memory is limited. The compression/decompression is
transparent to the application software. The video data rate through the V-Port path is
independent from the surrounding video graphics. Normally, any video loaded through
the V-Port is on the top of the surrounding graphics but color key support allows the
graphics to occlude the video window with insignificant or loss of video performance.
The V-Port accepts video data at the rate of the original video data and stores it in
display memory either in compressed format or directly. As the data transfer rate can
be different (and typically lower) that the rate at which the display device is operating,
the data can be simultaneously read out from the frame buffer and displayed at the
display device rate with real time decompression and transparently to the application
software.
§
Connection
The V-Port interface is available through the J11 connector. This connector is located
so it can be combined with the PC/104 connectors (P1/P2) to receive a stackable 8-bit
interface for PC/104 form factor products.
A Video Camera Interface PC-104 module is provided by TEKNOR for live video
inputs (NTSC, PAL, or S-video formats). It is referred to as TEK-380.
Exploring the Multimedia Capabilities of the Board
12-9
Advertisement
Table of Contents
