Audio Packet Type Flags - Analog Devices ADV7610 Hardware User's Manual

Hardware User Guide
FIFO_NEAR_OVFL_RAW, IO, Address 0x7E[7] (Read Only)
Status of audio FIFO near overflow interrupt signal. When set to 1, it indicates the audio FIFO is near overflow as the number FIFO
registers containing stereo data is greater or equal to value set in AUDIO_FIFO_ALMOST_FULL_THRESHOLD. Once set, this bit will
remain high until it is cleared via FIFO_NEAR_OVFL_CLR.
Function
FIFO_NEAR_OVFL_RAW
0 (default)
1
AUDIO_FIFO_ALMOST_EMPTY_THRESHOLD[6:0], Addr 68 (HDMI), Address 0x12[6:0]
Sets the threshold used for FIFO_NEAR_UFLO_RAW. FIFO_NEAR_UFLO_ST interrupt is triggered if audio FIFO goes below this level.
Function
AUDIO_FIFO_ALMOST_EMPTY_THRESHOLD[6:0]
0x02 (default)
AUDIO_FIFO_ALMOST_FULL_THRESHOLD[6:0], Addr 68 (HDMI), Address 0x11[6:0]
Sets the threshold used for FIFO_NEAR_OVRFL_RAW. FIFO_NEAR_OVRFL_ST interrupt is triggered if audio FIFO reaches this level.
Function
AUDIO_FIFO_ALMOST_FULL_THRESHOLD[6:0]
0x7D (default)

AUDIO PACKET TYPE FLAGS

The ADV7610 can receive the following audio packets:
•
Audio sample packets
•
HBR packets
•
DSD packets
•
DST packets
The following flags are provided to monitor the type of audio packets received by the ADV7610. Figure 13 shows the algorithm that can
be implemented to monitor the type of audio packet processed by the ADV7610.
AUDIO_MODE_CHNG_RAW, IO, Address 0x83[5] (Read Only)
Status of audio mode change interrupt signal. When set to 1, it indicates that the type of audio packet received has changed. The following
are considered audio modes, no audio packets, audio sample packet, DSD packet, HBR packet or DST packet. Once set, this bit remains
high until it is cleared via AUDIO_MODE_CHNG_CLR.
Function
AUDIO_MODE_CHNG_RAW
0 (default)
1
AUDIO_SAMPLE_PCKT_DET, Addr 68 (HDMI), Address 0x18[0] (Read Only)
Audio sample packet detection bit. This bit resets to zero on the 11th HSync leading edge following an audio packet if a subsequent audio
sample packet has not been received or if a DSD, DST, or HBR audio packet sample packet has been received.
Function
AUDIO_SAMPLE_PCKT_DET
0 (default)
1
Description
Audio FIFO has not reached high threshold defined in AUDIO_FIFO_ALMOST_FULL_THRESHOLD [5:0]
Audio FIFO has reached high threshold defined in AUDIO_FIFO_ALMOST_FULL_THRESHOLD [5:0]
Description
Default value
Description
Default value
Description
Audio mode has not changed.
Audio mode has changed.
Description
No L_PCM or IEC 61937 compressed audio sample packet received within the last 10 HSyncs
L_PCM or IEC 61937 compressed audio sample packet received within the last 10 HSyncs
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