Analog Devices ADV7850 Hardware Manual page 182

Function
hbr_audio_pckt_det
0 
1
bg_audio_detected[3:0], Addr 68 (HDMI), Address 0xEE[3:0] (Read Only)
This readback indicates if audio samples were received on the background port and, if so, their type.
Function
bg_audio_detected[3:0]
0000 
0001
0010
0100
1000
bg_audio_layout, Addr 68 (HDMI), Address 0xEE[5] (Read Only)
Flags layout of audio channels in background port selected with bg_meas_port_sel. Only valid when bg_audio_detected_bg flags audio
sample packets or DSD audio packets have been detected .
Function
bg_audio_layout
0 <<
1
bg_dst_double, Addr 68 (HDMI), Address 0xEE[4] (Read Only)
This readback indicates whether DST audio is sampled at a single or double transfer rate in the background port with
bg_meas_port_sel. It is only valid when bg_audio_detected indicates DST packets were received.
Function
bg_dst_double
0 
1
Notes:
• The ADV7850 processes only one type of audio packet at a time.
• The ADV7850 processes the latest type of audio packet that it received.
• A corresponding interrupt can be enabled for audio_mode_chng_raw by setting the mask audio_mode_chng_mb1 or
audio_mode_chng_mb2. Refer to Section
Rev. A May 2012
Description
No HBR audio packet received within last 10 HSyncs
HBR audio packet received within last 10 HSyncs
Description
No audio samples detected
Audio sample detected
DSD audio detected
DST audio detected
HBR audio detected
Description
Stereo Audio (may be compressed multichannel)
Multichannel uncompressed audio detected (3-8 channels)
Description
DST sample rate equals transfer rate
DST sample rate doubles transfer rate
15 for additional information on the interrupt feature.
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ADV7850