Analog Devices ADV7850 Hardware Manual page 180

fifo_underflo_raw, IO, Address 0x7E[6] (Read Only)
This readback indicates the status of audio FIFO underflow interrupt signal. When set to 1, it indicates the Audio FIFO read pointer has
reached the write pointer causing the audio FIFO to underflow. Once set, this bit remains high until it is cleared.
Function
fifo_underflo_raw
0 
1
fifo_overflo_raw, IO, Address 0x7E[5] (Read Only)
This readback indicates the status of the audio FIFO overflow interrupt signal. When set to 1, it indicates the audio FIFO write pointer
has reached the read pointer causing the audio FIFO to overflow. Once set, this bit remains high until it is cleared.
Function
fifo_overflo_raw
0 
1
fifo_near_uflo_raw, IO, Address 0x83[0] (Read Only)
This readback indicates the status of the audio FIFO near underflow interrupt signal. When set to 1, it indicates the audio FIFO near
underflow as the number of FIFO registers containing stereo data less or equal to the value set in audio_fifo_almost_empty_threshold.
Function
fifo_near_uflo_raw
0 
1
fifo_near_ovfl_raw, IO, Address 0x7E[7] (Read Only)
This readback indicates the status of the audio FIFO near overflow interrupt signal. When set to 1, it indicates the audio FIFO is near
overflow as the number of FIFO registers containing stereo data is greater or equal to the 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 
1
audio_fifo_almost_empty_threshold[6:0], Addr 68 (HDMI), Address 0x12[6:0]
This control is used to set the threshold used for fifo_near_uflo_raw. The fifo_near_uflo_st interrupt is triggered if audio FIFO goes
below this level.
Function
audio_fifo_almost_emp
ty_threshold[6:0]
0000010 
audio_fifo_almost_full_threshold[6:0], Addr 68 (HDMI), Address 0x11[6:0]
This control is used to set the threshold used for fifo_near_ovrfl_raw. The fifo_near_ovrfl_st interrupt is triggered if audio FIFO reaches
this level.
Rev. A May 2012
Description
Audio FIFO not underflowed
Audio FIFO underflowed
Description
Audio FIFO not overflowed
Audio FIFO overflowed
Description
Audio FIFO not reached low threshold defined in audio_fifo_almost_empty_threshold[5:0]
Audio FIFO reached low threshold defined in audio_fifo_almost_empty_threshold[5:0]
Description
Audio FIFO not reached high threshold defined in audio_fifo_almost_full_threshold[5:0]
Audio FIFO reached high threshold defined in audio_fifo_almost_full_threshold[5:0]
Description
Default
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ADV7850