GS1582 Datasheet, PDF (49/115 Pages) Gennum Corporation – Multi-Rate Serializer with Cable Driver, Audio Multiplexer and ClockCleaner™

group in IDB[1:0] of the host interface. 24-bit support is selected by setting the 24BIT bit
of host interface HIGH.
When the host interface CASCADE bit is set LOW, the audio core defaults to audio
groups 1 and 2, where Ain_1/2 and Ain_3/4 are multiplexed with audio group 1 DID,
and Ain_5/6 and Ain_7/8 with audio group 2 DID.
Table 4-10: Audio Group DID Host Interface Settings
Audio Group
SD
Data DID
SD
Extended DID
HD
Data DID
1
2FFh
1FEh
2E7h
2
1FDh
2FCh
1E6h
3
1FBh
2FAh
1E5h
4
2F9h
1F8h
2E4h
SD
Control DID
1EFh
2EEh
2EDh
1ECh
HD
Control DID
1E3h
2E2h
2E1h
1E0h
Host Interface
Register
Setting (2-bit)
00b
01b
10b
11b
Table 4-11: Audio Data and Control Packet DID Setting Register
Name
IDA[1:0]
IDB[1:0]
Description
Group 1 audio data and control
packet DID setting
Group 2 audio data and control
packet DID setting
Default CASCADE
set LOW
00b
01b
Default CASCADE
set HIGH
10b
11b
When the CASCADE bit is set HIGH, the GS1582 defaults to audio groups 3 and 4, where
Ain_1/2 and Ain_3/4 are multiplexed with audio group 3 DID, and Ain_5/6 and Ain_7/8
with audio group 4 DID.
NOTE: If IDA and IDB are set to the same value, these bits will automatically revert to
their default values.
Any other configurations can be programmed for the audio groups as required.
4.7.11 Audio Group Replacement
Audio group replacement mode allows the multiplexing of new audio groups, whilst
replacing existing embedded audio with the same group DID. All other embedded audio
groups will remain in the video stream. Up to two groups of audio (and extended audio
for SD formats) can be replaced at once.
The first function performed by the GS1582 is deleting the audio group or groups to be
replaced. The next step is removing and storing any other audio packets that are to be
preserved. The final step is to embed the new and stored audio data packets so they are
contiguous from the EAV (for HD formats, they will be contiguous after the line CRC
words). See Figure 4-17.
GS1582 Multi-Rate Serializer with Cable Driver, Audio
Multiplexer and ClockCleaner^TM
Data Sheet
40117 - 4
December 2011
49 of 115