Nevion FSR-HD - Manual (Page 13)

FRS-HD Rev. G
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If sync input disappears
Given that stable SDI input and sync input exists: If the sync signal disappears, the card
will act as in frame delay mode, see Chapter 3.5.2.
NOTE: This will result in a frame roll as the delay changes.
If sync input reappears
Given that a stable SDI input exists: If the sync signal reappears the delay mode will
change back to Frame Sync mode. Hence the internal clock will be locked to the sync
signal and the delay will again change.
NOTE: This will result in a frame roll as the delay changes.
If both signals disappears
The picture will first freeze for 1 second, and then go to color bar. The output is now
referenced to the local clock source. The local clock source has been synchronized with
the previous seen incoming sync, and remains stable as long as operating conditions
(such as temperature) does not change materially. Under stable conditions, the clock
source is accurate to within 1ppm of the last sync source, but the generator is not a
reference generator.
3.5.2 Frame delay mode
In this mode a sync signal is not present. The delay set is then directly related to the
incoming video. 1 frame and 1 line delay, means that the output will be 1 frame and 1
line delayed version of the input.
If video signal disappears
The picture will first freeze for 3 seconds and then go to color bar. The output is now
referenced to the local clock source. However this clock source will be kept within 1 ppm
of the last video source.
If video signal reappears
If the input video signal reappears the video will reappear on the output after 3 seconds
of stable input video. The delay will be set to the same delay as before loosing input.
NOTE: This may cause a frame roll.
If a sync input appears
Given that a stable SDI input exists: If a sync signal appears the delay mode will change
to Frame Sync mode, see Chapter 3.5.1. Hence the internal clock will be locked to the
sync signal and the delay will again change.
NOTE: This will result in a frame roll as the delay changes.
3.6 Video generator
The video generator can produce different simple signals: Color bar, Check field and flat
field.
The flat field is possible to set up with all luma and chroma values.
The generator may be used as the video source if there is no video signal present at
either of the video inputs. The generator may also be switched on with GYDA. This will
override video input but the generator signal will be locked to the input.
The video standard of the generator may be set with GYDA but only if there is no video
input present.