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

ARC-SD-DMUX Rev. B
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3.5.3.2 Pos when zoom is greater than 1:
The setting is in lines (vertical offset) and pixels (horizontal offset) but the values are also
scaled by the zoom factor. A zoom value larger than 1 with a position value of P will result
in the picture moving (P x zoom) pixels or lines.
Positive position values moves image right/up, negative values left/down.
The embedded AFD code for each User setting may be set. Use the figure in the AFD
conversion section to find the appropriate code.
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 changes,
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 between 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