GS1582-IBE3 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

GS1582-IBE3

Multi-Rate Serializer with Cable Driver, Audio Multiplexer and ClockCleaner™

Semtech Corporation 

Table 4-9: Audio Control Packet Word Descriptions (Continued)

Name

RATE

ACT

DELA0-3

DELB0-3

RSRV

CS

No. of

Words

1

1

3

Description

Sampling Frequency

Active Channel

Ch1/2 Delay Data

3

Ch3/4 Delay Data

2

Reserved Words

1

Checksum. Calculates the sum of

lower 9 bits of 15 words from

DID

Data

–

–

–

–

200h

–

Auto-Generation

Yes

ACT[8:1] setting

27-bit Host Interface

setting

27-bit Host Interface

setting

Yes

Yes

4.7.9.3 Audio Control Packet Insertion

To multiplex audio control packets for audio group 1 channels 1 to 4 (inputs Ain_1/2 and

Ain_3/4), the CTRA_ON bit of the host interface must be set HIGH. To multiplex audio

control packets for audio group 2 channels 5 to 8 (inputs Ain_5/6 and Ain_7/8), the

CTRB_ON bit must be set HIGH. In addition, the multiplexer will only embed or replace

group 1 control packets if one or more of ACT1, ACT2, ACT3 and ACT4 are set. Similarly,

group 2 control packets will only be embedded or replaced if ACT5, ACT6, ACT7 or

ACT8 are set.

By default, the audio control packets are embedded. The audio frame sequence is also

embedded for 29.97fps video standards. Setting the AFNA_AUTO and AFNB_AUTO bits

in the host interface LOW disable the audio frame sequence insertion. When set LOW,

the audio frame number will be set to zero (200h). The RATE word is always set to zero

to denote 48kHz audio only.

Control packet data can be programmed via the corresponding registers in the host

interface.

Refer to Section 4.13.3 for HD and SD audio multiplexer status and configuration

registers.

4.7.10 Setting Packet DID

The audio group DID for audio group 1 input channels 1 to 4 (Ain_1/2 and Ain_3/4) is set

in the IDA[1:0] bits of the host interface. The audio group DID for audio group 2 input

channels 5 to 8 (Ain_5/6 and Ain_7/8) is set in IDB[1:0] of the host interface. Table 4-10

shows the 2-bit host interface setting for the corresponding audio group DID.

For 24-bit audio support using the SD core, the extended audio group DID for audio

group 1 input channels 1 to 4 is set to the same group in IDA[1:0] of the host interface.

The extended audio group DID for audio group 2 input channels 5 to 8 is set to the same

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

48 of 115

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