Nevion ARC-SD-XMUX4 - Manual (Page 15)

ARC-SD-XMUX4 Rev. B
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Positive position values moves image right/up, negative values left/down.
An AFD code may be embedded. Use the figure in the AFD conversion section to find the
code that best describes the output picture.
3.6 Frame synchronizer
The frame synchronizer consists of a frame store buffer and some control logic. The frame
store buffer can store up to 8 SD frames. The frame synchronizer is placed after the ARC
block. The control logic sets the frame synchronizer either frame sync mode or frame delay
mode of operation depending on the presence of the sync input signal.
If the sync input presence changes, the operational mode of the modules will change
resulting in frame roll.
3.6.1 Frame Sync mode
If a sync input (B&B or Tri-level) is present, the module will output a signal that has a
constant relative timing to this signal. Two parameters can be set; output phase and
minimum delay.
The output phase can be positive or negative and sets the timing offset of the sync input and
the video output.
The minimum delay sets the minimum delay between video output and video input. The
actual delay can be larger than the minimum delay (hence the name), because the card must
also adjust the picture phase relative to the sync input.
The user may set the
‘minimum delay’ up to 7 frames.
3.6.2 Frame delay mode
This mode is active when a sync signal is not present. The minimum delay setting is then
used directly. 1 frame and 1 line minimum delay means that the output will be 1 frame and 1
line delayed version of the input.
3.7 Video generator
The video generator can produce one of the signals from the following list:-

Color bar

Checkfield

Color bar with moving black box

Black

White

Yellow

Cyan

Green

Magenta

Red

Blue
The flat field option allows the user to specify any combination of luma and chroma values.
In normal operation (as a fallback generator), the video generator will take its video standard
setting from the last video input seen by the board.