GS2971A Datasheet, PDF (93/152 Pages) Gennum Corporation – Integrated audio clock generator

Table 4-23 shows the host interface default settings for the Audio Channel Status block.
The audio de-embedder automatically generates the CRC word.
Table 4-23: Audio Channel Status Information Registers
Name
ACSR[7-0]
ACSR[15-8]
ACSR[23-16]
ACSR[31-24]:
ACSR[183-176]
ACS_REGEN
ACS_APPLY
ACS_APPLY_W
AIT[A:D]
ACS[7-0]:
ACS[183-176]
Description
Default
Audio channel status block byte 0 set. Used when ACS_REGEN is set HIGH
Audio channel status block byte 1 set. Used when ACS_REGEN is set HIGH
Audio channel status block byte 2 set. Used when ACS_REGEN is set HIGH
Audio channel status block data for bytes 3 to 22. Used when ACS_REGEN is set HIGH
85h
08h
28h (SD) 2Ch (HD)
00h
Audio channel status regenerate
0
Apply new ACSR data
0
Waiting to apply new ACSR data
0
Audio channel status block data for bytes 0 to 22
00h: 00h
Table 4-24:Audio Channel Status Block for Regenerate Mode Default Settings
Name
PRO
Emphasis
Sample Frequency
Channel Mode
AUX
Source Word Length
Byte
0
0
0
1
2
2
Bit
Default
Mode
0
1b
Professional use of channel status block
2-4
100b
100b None. Rec. manual override disabled
6-7
01b
48kHz. Manual override or auto disabled
0-3
0001b
Two channels. Manual override disabled
0-2
000b
SD Modes: Maximum audio word length is 20 bits
001b
HD Mode: Maximum audio word length is 24 bits
3-5
101b
Maximum word length (based on AUX setting).
24-bit for HD Mode; 20-bit for SD Modes
All other bits set to zero
4.19.3.7 Audio Mute
When the MUTE bits in the host interface are set HIGH, the audio outputs are muted (all
audio sample bits are set to zero). To set all the audio output channels to mute, set the
host interface MUTE_ALL bit HIGH.
GS2971A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54311 - 2
September 2012
93 of 152