GS2972 Datasheet, PDF (69/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4.8.3 HD ANC Insertion
When operating in HD mode (RATE_SEL0 = LOW, RATE_SEL1 = LOW), the GS2972
inserts VANC or HANC data packets into either the Y data stream or C data stream.
By default (at power up or after system reset), all ANC data insertion takes place in the Y
data stream.
The user can select between Y or C data stream for insertion on a per line basis in
Separate Line mode. The Y data stream is selected when the STREAM_TYPE_0 bit is LOW
(default). The C data stream is selected when the STREAM_TYPE_0 bit is HIGH.
The user can select between Y or C data stream for insertion on a single line basis in
Concatenated mode. The Y data stream is selected when the STREAM_TYPE_0 bit is
LOW (default). The C data stream is selected when the STREAM_TYPE_0 bit is HIGH.
Horizontal Ancillary data (HANC), is inserted into the Y or C data stream on the video
line(s) defined by the user.
Data insertion starts at the first available location in the HANC space, following any
audio and pre-existing arbitrary data packets. All Data Words identified by the user are
inserted in a contiguous fashion starting at the first available data space.
HANC data insertion terminates when all Data Words identified by the user have been
inserted; or by the start of the four word TRS SAV code, regardless of the number of Data
Words actually inserted.
Vertical Ancillary data (VANC), is inserted into the Y or C data stream on the video line(s)
defined by the user.
Data insertion starts at the first active pixel immediately following the last word of the
TRS SAV code. All Data Words identified by the user are inserted in a contiguous
fashion, starting at the first active pixel.
VANC data insertion terminates when all Data Words identified by the user have been
inserted; or by the start of the four word TRS EAV code, regardless of the number of Data
Words actually inserted.
The total number of Data Words to be inserted and the line number on which ANC data
insertion takes place is provided by the user via the host interface as part of the
configuration of the ANC data insertion function.
The user data for insertion is provided via host interface configuration.
STREAM_TYPE_1 = address 02Dh, STREAM_TYPE_0 for the four lines of insertion is at
addresses 026h (bit 14), 028h (bit 14), 02Ah (bit 14) and 02Ch (bit 14).
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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