AD1985

Rev. A | Page 27 of 48

Extended Audio ID Register (Index 0x28)

Reg

Num

Name

D15 D14 D13 D12 D11 D10 D9

D8

D7

D6

D5

D4

D3 D2

D1

D0

Default

0x28 Extended

Audio ID

AID1 AID0 X

X

REV1 REV0 AMAP AIDLDAC AIDSDAC AIDCDAC DSA1 DSA0 X

AIDSPDIF DRA

AIDVRA 0xXBC7

The extended audio ID register identifies which extended audio features are supported. A nonzero extended audio ID value indicates that

one or more of the extended audio features are supported.

AIDVRA

Variable Rate PCM Audio Support (Read-Only). This bit returns a 1 when read to indicate that variable rate PCM audio is

supported.

AIDSPDIF

SPDIF Support (Read-Only). This bit returns a 1 when read to indicate that SPDIF transmitter is supported (IEC958).

DRA

Double Rate Audio (Read-Only). This bit returns a 1 when read to indicate that the optional double rate PCM audio is supported

for PCM L and PCM R.

DAC Slot Assignments. (Read/Write; Reset Default = 00.)

00: DACs 1, 2 = 3 and 4

DACs 3, 4 = 7 and 8

DACs 5, 6 = 6 and 9

01: DACs 1, 2 = 7 and 8

DACs 3, 4 = 6 and 9

DACs 5, 6 = 10 and 11

10: DACs 1, 2 = 6 and 9

DACs 3, 4 = 10 and 11

DACs 5, 6 = 3 and 4

DSA[1:0]

11: DACs 1, 2 = 10 and 11

DACs 3, 4 = 3 and 4

DACs 5, 6 = 7 and 8

AIDCDAC

PCM Center DAC Support (Read-Only). This bit returns a 1 when read to indicate that PCM Center DAC is supported.

AIDSDAC

PCM Surround DAC Support (Read-Only). This bit returns a 1 when read to indicate that PCM surround left and right DACs are

supported.

AIDLDAC

PCM LFE DAC Support (Read-Only). This bit returns a 1 when read to indicate that PCM LFE DAC is supported.

AMAP

Slot DAC Mappings Based on Codec ID (Read-Only). This bit returns a 1 when read to indicate that slot/DAC mappings based on

codec ID is supported.

REV[1:0]

REV[1:0] = 10 Indicates That Codec Is AC ’97 Revision 2.3 Compliant (Read-Only).

AID[1:0]

Indicates Codec Configuration (Read-Only).

00 = Primary.

01, 10, 11 = Secondary.