GS2972 Datasheet, PDF (62/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

The contents of the Secondary Group audio control packet is specified using the
following host interface fields:
AFNB_AUTO Secondary Group audio frame number generation.
EBIT1B Secondary Group delay valid flag for channel 1.
DEL1B[25:0] Secondary Group delay for channel 1.
EBIT2B Secondary Group delay valid flag for channel 2.
DEL2B[25:0] Secondary Group delay for channel 2.
EBIT3B Secondary Group delay valid flag for channel 3.
DEL3B[25:0] Secondary Group delay for channel 3.
EBIT4B Secondary Group delay valid flag for channel 4.
DEL4B[25:0] Secondary Group delay for channel 4.
4.7.21 Audio Control Packet Insertion - HD and 3G
The GS2972 embeds audio control packets associated with the Primary Group audio and
the Secondary Group audio.
The Primary Group audio to be embedded is specified using the IDA[1:0] host interface
field. (Default is 00 in NORMAL mode).
The Secondary Group audio to be embedded is specified using the IDB[1:0] host
interface field. (Default is 01 in NORMAL mode).
The Primary Group audio control packets are embedded as commanded by the
CTRA_ON host interface bit. (Default is 1).
The Secondary Group audio control packets are embedded as commanded by the
CTRB_ON host interface bit. (Default is 1).
The Primary Group audio control packets are replaced as commanded by the CTR_AGR
host interface bit. (Default is 0).
The Secondary Group audio control packets are replaced as commanded by the
CTR_AGR and ONE_AGR host interface bits. (Default is 0).
The Primary Group audio control packets are not embedded or replaced unless one or
more of the ACT1, ACT2, ACT3 or ACT4 host interface bits are set.
The Secondary Group audio control packets are not embedded or replaced unless one
or more of the ACT5, ACT6, ACT7 or ACT8 host interface bits are set.
The contents of the Primary Group audio control packet is specified using the following
host interface fields:
AFNA_AUTO - Primary Group audio frame number auto-generation.
ASXA - Primary Group asynchronous mode.
DEL1_2A[25:0] - Primary Group audio delay for channels 1 and 2.
DEL3_4A[25:0] - Primary Group audio delay for channels 3 and 4.
The contents of the Secondary Group audio control packet is specified using the
following host interface fields:
AFNB_AUTO - Secondary Group audio frame number auto-generation.
ASXB - Secondary Group asynchronous mode.
DEL1_2B[25:0] - Secondary Group audio delay for channels 1 and 2.
DEL3_4B[25:0] - Secondary Group audio delay for channels 3 and 4.
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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