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Matrox Meteor-II /Multi-Channel grab section 61
■ The on-board crystal oscillator.
■ The horizontal video synchronization signal supplied by the
video source (line-locked mode).
When in line-locked mode and accepting a composite video
signal, the PLL can synchronize to either serrated or block
vertical synchronization signals.
■ The clock signal supplied by the video source (to generate a
different clock).
When the input source supplies a sampling clock that does not
require adjustment, the PLL is bypassed to avoid adding jitter
to the supplied clock.
General synchronization
Matrox Meteor-II /Multi-Channel can operate in either slave
or master mode.
Slave mode
■ In slave mode, the video source provides the synchronization
information to Matrox Meteor-II /Multi-Channel. It can
accept one of the following synchronization schemes:
❐ The video source encodes the synchronization signals on
the analog video signal provided to the board.
❐ The video source supplies the horizontal and/or vertical
synchronization signals separately in TTL format.
❐ The video source provides a composite synchronization
signal in TTL format, separate from the analog video.
■ Synchronization information can be sent either with the
video data, or on a separate analog synchronization channel.
Master mode
■ In master mode, Matrox Meteor-II /Multi-Channel
generates (using the PSG) the horizontal and/or vertical
(TTL) synchronization signals and supplies them to the video
source. This allows the video source to synchronize to the
board.