11 appendix e: vanc counter – Doremi HDG-20 User Manual

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11 Appendix E: VANC Counter

For 1080i-59.94 formats, when VANC is enabled, the HDG-20 can embed up to 4 data packets
on each of the following lines:

 Field-1: Lines 9 to 20
 Field-2: Lines 572 to 583

All packets are identical except for UDW0, UDW1 and CS that are used to indicate the line
number, packet number / field identifier and the checksum. The packet is structured as follows:

ADF1= 0x00
ADF2= 0xFF
ADF3= 0xFF
DID= 0x5F
SDID= 0xFA
DC=

0xFF

UDW0=

LSB byte of the line number

UDW1=

Packet Number and Field Identifier, 0x30 for packet-3 field-1 or 0x2F for packet-2

field-2
UDW2 .. UDW254= Hex value of a counter that starts at 0x00 and ends 0xFC
CS= Checksum

HDG.OM.000248.DRM

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