GS1582 datasheet(49/115 Pages) SEMTECH

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GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

49 of 115

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.

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.

Table 4-10: Audio Group DID Host Interface Settings

Audio Group

Data DID

Extended DID

Data DID

Control DID

Host Interface

Setting (2-bit)

2FFh

1FEh

2E7h

1EFh

1E3h

00b

1FDh

2FCh

1E6h

2EEh

2E2h

01b

1FBh

2FAh

1E5h

2EDh

2E1h

10b

2F9h

1F8h

2E4h

1ECh

1E0h

11b

Table 4-11: Audio Data and Control Packet DID Setting Register

Name

Description

Default CASCADE

set LOW

Default CASCADE

set HIGH

IDA[1:0]

Group 1 audio data and control

packet DID setting

00b

10b

IDB[1:0]

Group 2 audio data and control

packet DID setting

01b

11b

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