Analog Devices Advantiv ADV7611 Hardware User's Manual page 61

Hardware User Guide
Internal Mute Status
The internal mute status is provided through the INTERNAL_MUTE_RAW bit.
INTERNAL_MUTE_RAW, IO, Address 0x65[6] (Read Only)
Raw status signal of internal mute signal.
Function
INTERNAL_MUTE_RAW
0 (default)
1
AV Mute Status
AV_MUTE, Addr 68 (HDMI), Address 0x04[6] (Read Only)
Readback of AVMUTE status received in the last general control packet received.
Function
AV_MUTE
0 (default)
1
Audio Mute Signal
The ADV7611 can output an audio mute signal that can be used to control the muting in a back end audio device processing the audio
data output by the ADV7611 (for example, DSP).
The audio mute signal is output on the INT1 pin by setting
and INT2 is set via the INTRQ_OP_SEL[1:0]
The audio mute signal can also be output on the INT2 signal (via one of the following pins: SCLK/INT2, HPA_A/INT2 or MCLK/INT2)
by setting INTRQ2_MUX_SEL[1:0]
is set via INT2_POL.
Important
The ADV7611 may interface with an audio processor (for example, DSP) in which the muting of the audio is implemented. In this case,
the audio processor typically features a delay line followed by a mute block for audio mute and unmuting purposes. The following
hardware and software configuration is recommended for optimum muting performance of the ADV7611 and audio processor system:

Connect the mute signal of the ADV7611 to the audio processor mute input. The ADV7611 mute signal can now drive the
muting/unmuting of the audio data inside the audio processor.

Bypass the audio delay line of the ADV7611 with the following settings:

Set MAN_AUDIO_DL_BYPASS

Set AUDIO_DELAY_LINE_BYPASS

Configure the ADV7611 to mute the audio over one audio sample clock as follows:

Set AUDIO_MUTE_SPEED[4:0]
processor.
EN_MUTE_RAW_INTRQ, IO Map, Address 0x40[3]
A control to apply the internal audio mute signal on INT1 interrupt pin.
Function
EN_MUTE_RAW_INTRQ
0 (default)
1
EN_MUTE_RAW_INTRQ2, IO Map, Address 0x41[3]
A control to apply the internal audio mute signal on INT2 interrupt pin.
Function
EN_MUTE_RAW_INTRQ2
0 (default)
1
Description
Audio is not muted
Audio is muted
Description
AVMUTE not set
AVMUTE set
EN_MUTE_RAW_INTRQ
and INT2_POL controls respectively;
to 1 and EN_MUTE_OUT_INTRQ2 to 1. The active level of the mute signal output on the INT2 pin
to 1.
to 1.
to 1. This ensures that the ADV7611 never outputs invalid audio data out to the audio
Description
Does not output audio mute signal on INT1
Outputs audio mute signal on INT1
Description
Does not output audio mute signal on INT2
Outputs audio mute signal on INT2
Rev. A | Page 61 of 184
to 1. The active level of the mute signal on INT1
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