Nevion UDC-3G-XMUX4+ - Manual (Page 29)

UDC-3G-XMUX4+ Rev. C
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3.6.4.2 Mode 2: AFD or default
This mode will only use the AFD information. The default scaling will be used if SMPTE
2016, VI, and WSS are all missing, or if the active format descriptor is set to ‘Unknown’.
3.6.4.3 Mode 3: Fill mode or default
This mode will only use the input aspect ratio part of the information from the SMPTE
2016/VI/WSS and disregard the active format descriptor. If SMPTE 2016, VI nor WSS are
present, the S352M packet will be used, if present. If S352M is also missing, the default
scaling will be used.
3.6.4.4 AFD conversions
Figure 18 shows the different transitions that are defined. The incoming format is given by
the AFD/VI/WSS, and the user has supplied the output environment. To avoid clutter,
transitions from a state to itself are not shown in the figure. The corresponding AFD format is
shown for reference.
The figure looks confusing at first, but observe that each of the states have only one arrow
leading from itself to the other column. This arrow defines the normal conversion when the
input environment is different from the output environment. Find the picture type that you
have on the input and follow the arrow to the other column to find the conversion that will be
performed when the AFD code is present.
There are a few states where the input picture has both horizontal and vertical curtains and
these also have arrows within the same column. These are conversions that will be
performed when the input environment is the same as the output environment.