Analog Devices Advantiv ADV7619 Hardware User's Manual page 72

UG-237
•
Audio mute controller takes in event detection signals that can be used to determine when an audio mute is needed. The controller
generates a mute signal to the ramped audio block and a coast signal to the digital PLL generating the audio clock.
•
Ramped audio mute block that can mute the audio over the course of 512 stereo samples.
Notes
•
The ADV7619 mutes only the noncompressed data from the audio sample packets output through the I
•
The audio delay line is automatically bypassed when the ADV7619 receives multichannel audio or when it receives the following
audio packets:
•
DSD packets
•
HBR packets
•
The ramped audio mute block is always bypassed when the part received compressed audio or when it received the following audio
packets:
•
DSD packets
•
HBR packets
Delay Line Control
The audio delay line should be enabled when the ADV7619 is configured for automatic mute. The audio delay line is controlled by the
MAN_AUDIO_DL_BYPASS and AUDIO_DELAY_LINE_BYPASS bits.
MAN_AUDIO_DL_BYPASS , Addr 68 (HDMI), Address 0x0F[7]
Audio delay bypass manual enable. The audio delay line is automatically active for stereo samples and bypassed for multichannel samples.
By setting MAN_AUDIO_DL_BYPASS to 1, the audio delay bypass configuration can be set by the user with the AUDIO_DELAY_
LINE_BYPASS control.
Function
MAN_AUDIO_DL_BYPASS
0 (default)
1
AUDIO_DELAY_LINE_BYPASS , Addr 68 (HDMI), Address 0x0F[6]
Manual bypass control for the audio delay line. Only valid if MAN_AUDIO_DL_BYPASS is set to 1.
Function
AUDIO_DELAY_LINE_BYPASS
0 (default)
1
Audio Mute Configuration
The ADV7619 can be configured to automatically mute an L-PCM audio stream when selectable mute conditions occur. The audio
muting is configured as follows:
•
Set the audio muting speed via AUDIO_MUTE_SPEED[4:0] .
•
Set NOT_AUTO_UNMUTE , as follows:
•
Set NOT_AUDIO_UNMUTE[2:0] to 0 if the audio must be unmuted automatically after a delay set in WAIT_UNMUTE[2:0]
after all selected mute conditions have become inactive.
•
Set NOT_AUTO_UNMUTE to 1 if the audio must be unmuted manually (for example, by an external controller) when all
selected mute conditions have become inactive.
•
Select the mute conditions that trigger an audio mute (refer to Table 18).
•
Select the Audio PLL coast conditions (refer to the Audio DPLL Coast Feature section).
•
Set WAIT_UNMUTE[2:0] to configure the audio counter that triggers the audio unmute when it has timed out after all selected
mute conditions have become inactive.
Description
Audio delay line is automatically bypassed if multichannel audio is received. The audio delay line is
automatically enabled if stereo audio is received.
Overrides automatic bypass of audio delay line. Audio delay line is applied depending on the
AUDIO_DELAY_LINE_BYPASS control.
Description
Enables the audio delay line
Bypasses the audio delay line
Rev. A | Page 72 of 204
Hardware User Guide
2
S and the SPDIF interface.