Analog Devices Advantiv ADV7619 Hardware User's Manual page 73

Hardware User Guide
The ADV7619 internally unmutes the audio if the following three conditions (listed in order of priority) are met:
•
Mute conditions are inactive.
•
NOT_AUTO_UNMUTE is set to 0.
•
Audio unmute counter has finished counting down or is disabled.
Notes
•
Both Table 8 and Table 18 provide a column with the heading: Corresponding Status Register(s). This column lists the status registers
that convey information related to their corresponding audio mute masks or coast masks.
•
The ADV7619 also mutes the DSD stream when one of the selected mute conditions occurs (refer to Table 18) by outputting the
DSD mute pattern 0101010101... A DSD decoder receiving this stream outputs a 0 V mean analog stream.
•
The ADV7619 can mute the audio data with compressed audio data or HBR packets. In these cases mute will output constant stream
of 0
•
For the best audio muting performance, the following setting is recommended when the ADV7619 receives multichannel sample
packets:
•
Set AUDIO_MUTE_SPEED to 1
•
For best audio muting performance, the following settings are recommended when the audio sampling frequency of the audio stream
is greater than 48 kHz:
•
Set AUDIO_MUTE_SPEED to 1
•
Set MAN_AUDIO_DL_BYPASS to 1
•
Set AUDIO_DELAY_LINE_BYPASS to 1
•
For best audio muting performance, the following settings are recommended when the audio sampling frequency of the audio stream
is equal to or lower than 48 kHz:
•
Set AUDIO_MUTE_SPEED to 0x1F
•
Set MAN_AUDIO_DL_BYPASS to 0
MUTE_AUDIO , Addr 68 (HDMI), Address 0x1A[4]
A control to force an internal mute independently of the mute mask conditions
Function
MUTE_AUDIO
0 (default)
1
AUDIO_MUTE_SPEED[4:0] , Addr 68 (HDMI), Address 0x0F[4:0]
Number of samples between each volume change of 1.5dB when muting and unmuting
Function
AUDIO_MUTE_SPEED[4:0]
0x1F (default)
NOT_AUTO_UNMUTE , Addr 68 (HDMI), Address 0x1A[0]
A control to disable the auto unmute feature. When set to 1, audio can be unmuted manually if all mute conditions are inactive by setting
NOT_AUTO_UNMUTE to 0 and then back to 1.
Function
NOT_AUTO_UNMUTE
0 (default)
1
WAIT_UNMUTE[2:0] , Addr 68 (HDMI), Address 0x1A[3:1]
A control to delay audio unmute. Once all mute conditions are inactive WAIT_UNMUTE[2:0] can specify a further delay time before
unmuting. NOT_AUTO_UNMUTE must be set to 0 for this control to be effective.
Description
Audio in normal operation
Force audio mute
Description
Default value
Description
Audio unmutes following a delay set by WAIT_UNMUTE after all mute conditions have become inactive
Prevents audio from unmuting automatically
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