GS1503B datasheet(39/90 Pages) GENNUM

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GS1503B HD Embedded Audio CODEC

Data Sheet

37953 - 1

December 2009

39 of 90

4.10.2 Audio Control Packet DID Setting

To multiplex audio control packets for audio channels 1 to 4 (inputs AIN1/2 and AIN3/4),

the CTRONA bit 2 of Host Interface register 02Fh must be set HIGH. To multiplex audio

control packets for audio channels 5 to 8 (inputs AIN5/6 and AIN7/8), the CTRONB bit 2

of Host Interface register 020h must be set HIGH.

The audio control packet group DID for audio input channels 1 to 4 is set in CTRIDA[1:0]

bits 1-0 of Host Interface register 02Fh. The audio control packet group DID for audio

input channels 5 to 8 is set in CTRIDB[1:0] bits 3-2 of Host Interface register 020h.

Table 4-30 shows the 2-bit Host Interface setting for the corresponding audio control

packet group DID.

When CASCADE is set LOW (external pin or register), the GS1503B will default to audio

groups 1 and 2, where the audio control packet for AIN1/2 and AIN3/4 will be

multiplexed with group 1 DID, and AIN5/6 and AIN7/8 with group 2 DID.

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

Interface.

Table 4-29: Audio Control Packet Word Descriptions

Name

No of Words

Description

Data

Auto-Generation

ADF

Ancillary Data Flag

000h

3FFh

Yes

DID

Audio Group Data ID

1E3h

2E2h

2E1h

1E0h

See Table 4-30 in

Section 5.8.2

DBN

Data Block Number

200h

Yes

Data Count

10Bh

Yes

Audio Frame Number

–

9-bit Host Interface

Setting

RATE

Sampling Frequency

–

4-bit Host Interface

Setting

ACT

Active Channel

–

CHACT[7:0] setting

DEL1-2

Ch1/2 Delay Data

–

26-bit Host Interface

setting

DEL3-4

Ch3/4 Delay Data

–

26-bit Host Interface

setting

RSRV

Reserved Words

200h

18-bit Host Interface

setting

Checksum. Calculates

the sum of lower 9 bits

of 15 words from DID

–Yes

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