GS2970 Datasheet, PDF (89/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

4.19.3.7 Audio Mute
When the MUTE bits in the host interface are set HIGH, the audio outputs are muted (all
audio sample bits are set to zero). To set all the audio output channels to mute, set the
host interface MUTE_ALL bit HIGH.
Table 4-26: Audio Mute Control Bits
Name
MUTE_ALL
MUTE8
MUTE7
MUTE6
MUTE5
MUTE4
MUTE3
MUTE2
MUTE1
Description
Ch1-8 audio mute enable (1: Enabled)
Ch8 audio mute enable (1: Enabled)
Ch7 audio mute enable (1: Enabled)
Ch6 audio mute enable (1: Enabled)
Ch5 audio mute enable (1: Enabled)
Ch4 audio mute enable (1: Enabled)
Ch3 audio mute enable (1: Enabled)
Ch2 audio mute enable (1: Enabled)
Ch1 audio mute enable (1: Enabled)
Default
0
0
0
0
0
0
0
0
0
4.19.3.7.1 Mute On Loss Of Lock
When the GS2970 loses lock (LOCKED signal is LOW), the audio de-embedder sets all
audio outputs LOW (no audio formatting is performed). The ACLK, WCLK and AMCLK
outputs are also forced LOW.
4.19.4 Error Reporting
4.19.4.1 Data Block Number Error
When the 1-255 count sequence in the Data Block Number (DBN) word of Group A audio
data packets is discontinuous, the DBNA_ERR bit in the host interface
AUDIO_ERROR_STAT_X register is set HIGH. When the 1-255 count sequence in the
DBN word of Group B audio data packets is discontinuous, the DBNB_ERR bit in the
AUDIO_ERROR_STAT_X register is set HIGH.
The DBNA_ERR and DBNB_ERR flags also have associated SD_AUDIO_ERROR_MASK
and HD_AUDIO_ERROR_MASK register flags for configuration of error reporting in the
Receiver. The DBNA_ERR and DBNB_ERR flags remains set until cleared by writing to
these locations.
4.19.4.2 ECC Error
The GS2970 monitors the ECC error status of the two selected audio groups, as described
in Section 4.19.2.6 on page 82.
The ECC[N]_ERROR flags also have associated SD_AUDIO_ERROR_MASK and
HD_AUDIO_ERROR_MASK register flags for configuration of error reporting in the
Receiver. The ECC[N]_ERROR flags remain set until read via the host interface.
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
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