Audio Setup; Input Format; Table 92: Valid Configuration For Audio_Mode[1:0] - Analog Devices ADV7850 Hardware Manual

13.12 AUDIO SETUP

Input Format

13.12.1
The ADV7850 is capable of receiving audio data in I2S, SPDIF, DSD or High Bit Rate (HBR) formats for packetization and transmission
over the HDMI output interface.
audio_sel[2:0], audio_mode[1:0]
audio_sel[2:0], Addr B8 (Main), Address 0x0A[6:4]
This control is used to select the audio input format.
Function
audio_sel[2:0]
000 
001
010
011
100
i2sformat[1:0], Addr B8 (Main), Address 0x0C[1:0]
This control is used to select the I2S output format.
Function
i2sformat[1:0]
00 
01
10
11
audio_mode[1:0], Addr B8 (Main), Address 0x0A[3:2]
This control is used to set the audio mode selection. This is used in conjunction with audio_sel and i2sformat.
Function
audio_mode[1:0]
00 
01
10
11
audio_input_sel Value
0b010
0b011
Rev. A May 2012
and i2sformat[1:0] must be used to configure the Tx core according to the incoming audio input.
Description
I2S
SPDIF
One bit audio (DSD)
High bit rate (HBR) audio
DST
Description
I2S
Right justified
Left justified
AES3 direct mode
Description
DSD raw mode (DSD case), four streams with BPM encoding (HBR case)
DSD raw mode (DSD case), four streams, no BPM encoding (HBR case)
SPDIF mode (DSD case), one stream with BPM encoding (HBR case)
SPDIF mode (DSD case) one stream, no BPM encoding (HBR case)
Table 92: Valid Configuration for
audio_mode Value
Options
0b0x
0b1x
0b00
0b01
0b10
0b11
audio_mode[1:0]
Corresponding Configuration
DSD in Raw mode
DSD in SDIF-3 mode
HBR input as 4 streams, with Bi-Phase Mark (BPM) encoding
HBR input as 4 stream, without BPM encoding
HBR input as 4 stream, without BPM encoding
HBR input as 1 stream, without BPM encoding
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ADV7850