Audio Fifo; Table 16: Selectable Coast Conditions - Analog Devices Advantiv ADV7604 Hardware Manual

Bit Name
AC_MSK_VCLK_CH
NG
AC_MSK_VPLL_UN
LOCK
AC_MSK_NEW_CTS
AC_MSK_NEW_N
AC_MSK_CHNG_PO
RT
AC_MSK_VCLK_DE
T

7.16.2 Audio FIFO

The audio FIFO can store up to 64 audio stereo data from the audio sample, DSD or HBR packets.
Stereo audio data are added into the FIFO from the audio packet received. Audio stereo data are
retrieved from the FIFO at a rate corresponding to 128 times the audio sampling frequency, f
The audio FIFO is reset any time an audio unmute is generated – either internally generated or
manually unmuted. After then audio FIFO reset, data is not extracted from the audio FIFO until it has
reached half full level.
The status of the audio FIFO can be monitored through the status flags FIFO_UNDERFLO_RAW,
FIFO_OVERFLO_RAW, FIFO_NEAR_OVFL_RAW, and FIFO_NEAR_UFLO_RAW.
Rev. F August 2010

Table 16: Selectable Coast Conditions

HDMI
Map Description
Address
0x13[6] When set to 1, audio DPLL coasts if
TMDS clock has any
irregular/missing pulses
0x13[5] When set to 1, audio DPLL coasts if
TMDS PLL unlocks
0x13[3] When set to 1, audio DPLL coasts if
CTS changes by more than threshold
set in
CTS_CHANGE_THRESHOLD[5:0]
0x13[2] When set to 1, audio DPLL coasts if
N changes
0x13[1] When set to 1, audio DPLL coasts if
active port is changed
0x13[0] When set to 1, audio DPLL coasts if
TMDS clock is not detected
133
ADV7604
Corresponding
Status Registers(s)
VCLK_CHNG_RA
W
VIDEO_PLL_LCK_
RAW
CTS_PASS_THRSH
_RAW
CHANGE_N_RAW
HDMI_PORT_SEL
ECT
TMDS_CLK_A_RA
W,
TMDS_CLK_B_RA
W,
TMDS_CLK_C_RA
W
.
s