STAC9271 datasheet(189/223 Pages) IDT

189 / 223 page

STAC9271/9272/9273/9274

10-CHANNEL HIGH DEFINITION AUDIO CODEC

PC AUDIO

IDT™

10-CHANNEL HIGH DEFINITION AUDIO CODEC

189

STAC9271/9272/9273/9274 V 1.0 MARCH2007

IDT CONFIDENTIAL

6.31. VolumeKnob Node (NID = 0x24)

6.31.1. VolumeKnob WCap

[4]

ADATFRMT

0x0

ADAT Sample Split Format Select 1: U user bits U3 and U2 in

the transmitted ADAT stream are supplied by bits 3:2 of this

verb (field ADAT), under software control. 0: U user bits U3

and U2 in the transmitted ADAT stream are controlled

automatically by hardware, derived according to the

sample-rate of the outgoing audio stream. Hardware support is

provided for the transfer of double- and quad-rate data

streams over the 48 KHz (nominal) 8-channel ADAT interface.

Two 2-channel (stereo) streams or one 4-channel audio

stream at double-rate or one 2-channel stream at quad-rate

will be sample-split over the appropriate ADAT channels. For

each mode, the ADAT channels are listed in the order of arrival

of the corresponding audio sample: ADAT_2CH_SGL C0,C1

(C2-C7 zero padded) ADAT_2CH_DBL C0,C2,C1,C3 (C4-C7

zero padded) ADAT_2CH_QUAD C0,C4,C1,C5,C2,C6,C3,C7

ADAT_4CH_SGL C0,C1,C2,C3 (C4-C7 zero padded)

ADAT_4CH_DBL C0,C2,C4,C6,C1,C3,C5,C7

ADAT_8CH_SGL C0,C1,C2,C3,C4,C5,C6,C7

[3.:0]

ADAT

0x0

ADAT Lightpipe Control Used in conjunction with the ADAT

Sample Rate in the stream converter to generate the 4 bit

ADAT control signals. ADAT0 (U0): Time Code FLAG ADAT1

(U1): MIDI FLAG ADAT2 (U2): 0 = 44.1/48 KHz audio (1X

operation) 1 = 88.2/96 KHz audio (2X operation) ADAT3 (U3):

1 = 176.4/192 KHz audio (4x operation) User bits U0 and U1

are always under software control. User bits U2 and U3 are

also under software control if ADATFRMT is set. If ADATFRMT

= 0, then bits 3:2 here are ignored and the bits transmitted as

U3:U2 are controlled by hardware according to the

sample-rate of the data stream.

Table 466. VolumeKnob WCap

Command Verb Format

Verb ID

Payload

Response

Get

F00

See bitfield table.

Table 465. ADATOut VCSR0

Command Response Format

Bit

Bitfield Name

Reset

Description

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