Audio Packet Type Flags - Analog Devices Advantiv ADV7619 Hardware User's Manual

Hardware User Guide
Function
FIFO_OVERFLO_RAW
0 (default)
1
FIFO_NEAR_UFLO_RAW, IO, Address 0x83[0] (Read Only)
Status of audio FIFO near underflow interrupt signal. When set to 1, it indicates the audio FIFO is near underflow as the number of FIFO
registers containing stereo data is less or equal to value set in AUDIO_FIFO_ALMOST_EMPTY_THRESHOLD. Once set, this bit will
remain high until it is cleared via FIFO_NEAR_UFLO_CLR.
Function
FIFO_NEAR_UFLO_RAW
0 (default)
1
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 ADV7619 can receive the following audio packets:
•
Audio sample packets—receive and process
•
HBR packets—receive and process
•
DSD packets— receive and process
•
DST packets—detection only
The following flags are provided to monitor the type of audio packets received by the ADV7619. Figure 18 shows the algorithm that can
be implemented to monitor the type of audio packet processed by the ADV7619.
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
Description
Audio FIFO has not overflowed.
Audio FIFO has overflowed.
Description
Audio FIFO has not reached low threshold defined in AUDIO_FIFO_ALMOST_EMPTY_THRESHOLD [5:0].
Audio FIFO has reached low threshold defined in AUDIO_FIFO_ALMOST_EMPTY_THRESHOLD [5:0].
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.
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