Audio Infoframe; Figure 133: Definition Of Channel Status Bits 20 To 23 - Analog Devices ADV7850 Hardware Manual

Audio InfoFrame

13.12.11
The audio InfoFrame allows the sink to identify the characteristics of an audio stream before the channel status information is available.
The ADV7850 can be configured to transmit audio InfoFrame by setting
is enabled, the ADV7850 transmits an audio InfoFrame once every two video fields.
used to configure audio InfoFrames.
audioif_pkt_en, Addr B8 (Main), Address 0x44[3]
This control is used to enable an audio InfoFrame.
Function
audioif_pkt_en
0
1 
Rev. A May 2012
S t a r t
Au d i o Sa mp l e Pa cke t H e a d e r
L a yo u t b i t
1
Au d i o Sa mp l e Pa cke t H e a d e r
sa mp l e _ p re se n t . sp X b i t
1
Au d i o Sa mp l e Su b p a cke t X
C l [ 2 3 : 2 0 ] = 2 ( X ) + 1
C r [ 2 3 : 2 0 ] = 2 ( X ) + 2
Au d i o Sa mp l e Su b p a cke t X

Figure 133: Definition of Channel Status Bits 20 to 23

Description
Disable audio InfoFrame
Enable audio InfoFrame
0
Au d i o Sa mp l e Pa cke t H e a d e r
sa mp l e _ p re se n t . sp X b i t
1
0
Au d i o Sa mp l e Su b p a cke t X
C l [ 2 3 : 2 0 ] = 1
C r [ 2 3 : 2 0 ] = 2
N o t Pre se n t
audioif_pkt_en to 1. When the transmission of audio InfoFrame
Table 99
377
provides a list of the registers that can be
ADV7850