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GS2970A Datasheet(PDF) 86 Page - Semtech Corporation

Part # GS2970A
Description  3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

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GS2970A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54244 - 2
September 2012
86 of 150
4.19.2.4 Setting Packet DID
Table 4-19 below, shows the 2-bit host interface setting for the audio group DID's.
For 24-bit audio support in SD mode, extended audio packets for Group A must have the
same group DID set in IDA[1:0] of the host interface. Extended audio packets for Group
B must have the same group DID set in IDB[1:0] of the host interface.
The audio de-embedder automatically detects the presence of extended audio packets.
When detected, the audio output format is set to 24-bit audio sample word length.
The audio de-embedder defaults to audio Groups One and Two, where Group A is
extracted from packets with audio Group One DID, and Group B from packets with
audio Group Two DID.
NOTE: To keep sample delays between audio channels the same after changing the
value of IDA or IDB in the SD audio core, the audio FIFOs must be cleared. This is
accomplished by asserting CLEAR_AUDIO and de-asserting at least one frame later.
When the FIFOs are in the clear state, audio will be muted, but audio clocks will continue
to run.
4.19.2.5 Audio Packet Delete Block
To delete all ancillary data with a group DID shown in Table 4-19, the ALL_DEL bit in the
host interface must be set HIGH.
4.19.2.6 ECC Error Detection & Correction Block (HD Mode Only)
The audio de-embedder performs BCH(31,25) forward error detection and correction, as
described in SMPTE 299M. The error correction for all embedded audio data packets is
activated when the host interface ECC_OFF bit is set LOW (default LOW). The audio
de-embedder corrects any errors in both the audio output and the embedded packet.
Table 4-19:Audio Group DID Host Interface Settings
Audio
Group
SD Data
DID
SD Extended
DID
HD Data
DID
SD Control
DID
HD Control
DID
Host Interface Register Setting
(2-bit)
1
2FFh
1FEh
2E7h
1EFh
1E3h
00b
21FDh
2FCh1E6h
2EEh
2E2h
01b
3
1FBh
2FAh
1E5h
2EDh
2E1h
10b
4
2F9h
1F8h
2E4h
1ECh
1E0h
11b
Table 4-20:Audio Data and Control Packet DID Setting Register
Name
Description
Default
IDA[1-0]
Group A Audio data and control packet DID setting
00b
IDB[1-0]
Group B Audio data and control packet DID setting
01b


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