NVIDIA Corporation
44
Quadro FX 4800/5800 and Quadro CX SDI User’s Guide
– Version 1.0
C
HAPTER
4
Linux—Using the Graphics to Video Out Control Panel
Synchronizing the SDI Output to an External Source
You
can
synchronize
the
SDI
output
with
other
equipment
in
a
broadcast
or
post
production
environment.
Genlock Versus Frame Lock
The
Graphics
to
SDI
page
provides
two
methods
for
synchronizing
the
SDI
output
to
a
common
sync
source—Genlock
and
Frame
lock.
Using Genlock
Genlock
synchronizes
the
pixel
scanning
of
the
SDI
output
to
an
external
synchronization
source.
When
using
genlock,
the
SDI
refresh
rate
is
determined
by
the
sync
source,
so
any
refresh
rates
that
you
may
have
chosen
in
the
Output
Video
Format
list
do
not
apply.
Using Frame Lock
Frame
lock
synchronizes
the
frame
rate
of
the
SDI
output
to
an
external
synchronization
source.
When
using
frame
lock,
only
modes
that
are
valid
for
the
frame
rate
of
the
sync
source
can
be
used
for
the
SDI
output.
The
valid
modes
will
appear
in
the
Output
Video
Format
list.
Supported Synchronization Signals
NVIDIA
Genlock
supports
the
following
external
synchronization
signal
types:
• SDI
• Composite
Bi
‐
level
(NTSC
or
PAL
sources
use
bi
‐
level
composite
signals.)
• Composite
Tri
‐
level
(HDTV
sources
commonly
use
tri
‐
level
composite
signals.)
