Dst Audio Interface And Output Controls; Figure 71: Dst Timing Diagram For Dst_Double = 0; Table 22: Dst Interface Description - Analog Devices ADV7850 Hardware Manual

Function
mux_dsd_out
0 
1

DST Audio Interface and Output Controls

7.28.3
The ADV7850 incorporates a DST interface that outputs audio data extracted from DST packets. The transfer rate of the DST packets
is indicated via dst_double.
dst_double, Addr 68 (HDMI), Address 0x19[2] (Read Only)
This readback indicates when the DST audio is double data rate.
Function
dst_double
0 
1
Important:
• The bit clock frequency equals 64 times the audio sampling frequency, that is, 64 fs
• dst_double indicates the transfer rate set by the latest DST packet processed by the ADV7850
A control is provided to change the mapping between the audio output ports and DST signals.
dst_map_rot[2:0], Addr 68 (HDMI), Address 0x6E[2:0]
This control is used to select the arrangement of the DST interface on the audio output port pins.
Function
dst_map_rot[2:0]
000
001
010
011
100 
101
110
111
Rev. A May 2012
Description
Override by outputting I2S data
Override by outputting DSD/DST data
Description
No DST double data rate audio detected
DST double data rate audio detected
Description
[DST_S on AP0] [DST_FF on AP5]
[DST_S on AP1] [DST_FF on AP5]
[DST_S on AP2] [DST_FF on AP5]
[DST_S on AP3] [DST_FF on AP5]
[DST_S on AP4] [DST_FF on AP5]
Reserved
Reserved
Reserved

Table 22: DST Interface Description

DST Interface IO
DST_S
SCLK
DST_FF
MCLKOUT
DST_CLK
DST_S
DST_FF

Figure 71: DST Timing Diagram for DST_DOUBLE = 0

Function
DST stream
Bit clock
DST frame flag
Audio master clock output
Frame n
189
ADV7850
Frame n + 1