Nevion DAC-AVA-DMUX - Manual (Page 26)

DAC-AVA-DMUX Rev. A
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Lower limit Luma: 040h
Chroma: 040h
With the legalizer disabled the video processing block hard clips both luma and chroma to
3FBh and 004h.
4.3.10 SDI output selectors
The board has four outputs organized as two pairs, each consisting of one inverting and
one non-inverting output. The signal to each of these two pairs can be routed either directly
from the re-clocker
(“Through”) or from the audio/video processing unit (“Processed”).
Figure 18: Multicon GYDA view of SDI output selection block
All features that requires modification of the video content (video generator, label overlay,
etc.) requires that the output is set to Processed. Note that when the internal video
generator is selected (either because it was selected as main in Video in, or because it was
selected as fallback for a missing input), outputs set to Through will behave as if Mute was
selected.
4.3.11 EDH processing block
If enabled, the EDH processing block extracts the EDH package from the video, updates
the EDH flags according to SMPTE RP165 and inserts the EDH package into the ancillary
data of the video.
If disabled, The EDH processing block only reads, processes and reports the EDH package
without changing it in the video stream.
4.3.12 Signal integrity
The DAC-AVA-DMUX module can detect a number of errors in incoming video, and in
some cases also correct them. Each type of error has its own bit in what is known as an
error mask, and the user can select which of the errors will be ignored and which will be
counted in the error counter. This error counter is in turn the Multicon tool to raise alarms if
the maximum error rate is exceeded. The types of errors that are detected and counted are
shown dynamically on th
e module’s Information page.
Figure 19: Multicon GYDA view of the signal integrity block
The error types that the module can detect are:
NO_EDH: No EDH flags detected
VS: SMPTE-352M package and the video frame are not consistent
FF-CRC: Full-frame checksum error
AP-CRC: Active picture checksum error
LOCK : Can’t lock to incoming video standard
CCS / YCS: Checksum error in ancillary data packets, Y or C data space.
CCRC / YCRC: Line checksum error, Y or C (HD only)
LNUM: Unexpected line number sequence (HD only)