REV. 0

AD1980

–13–

CD Volume Register (Index 12h)

Reg

No. Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

12h CD Volume

CVM

X

X

LCV4 LCV3

LCV2 LCV1 LCV0 CDRM

* XX

RCV4 RCV3

RCV2

RCV1

RCV0

8808h

*For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.

If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table IV for examples.

Line-In Volume Register (Index 10h)

Reg

No. Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

10h Line-In Volume LVM

X

X

LLV4 LLV3

LLV2

LLV1 LLV0

LVRM

* XX

RLV4 RLV3

RLV2

RLV1 RLV0 8808h

*For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.

If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table IV for examples.

RLV[4:0]

Right Line-In Volume. Allows setting the Line-In Right channel attenuator in 32 volume levels with 31 steps of

1.5 dB each. The LSB represents 1.5 dB, and the range is +12 dB to –34.d dB. The default value is 0 dB, mute enabled.

RM

Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately

from the LIM bit. Otherwise, this bit will always read “0” and will have no effect when set to “1.”

LLV[4:0]

Left Line-In Volume. Allows setting the Line-In left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each.

The LSB represents 1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.

LVM

Line-In Mute. When this bit is set to “1,” both the left and the right channels are muted, unless the MSPLT bit in

Register 76h is set to “1,” in which case this mute bit will only affect the left channel.

RCV[4:0]

Right CD Volume. Allows setting the CD right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each.

The LSB represents 1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.

RM

Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the Right channel separately

from the CVM bit. Otherwise this bit will always read “0” and will have no effect when set to “1.”

LCV[4:0]

Left CD Volume. Allows setting the CD left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each.

The LSB represents 1.5 dB, and the range is +12 dB to –24.5 dB. The default value is 0 dB, mute enabled.

CVM

CD Volume Mute. When this bit is set to “1,” both the left and the right channels are muted, unless the MSPLT bit

in Register 76h is set to “1,” in which case this mute bit will affect only the left channel.

RAV[4:0]

Right AUX Volume. Allows setting the AUX right channel attenuator in 32 volume levels with 31 steps of 1.5 dB

each. The LSB represents 1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.

RM

Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately

from the AVM bit. Otherwise, this bit will always read “0” and will have no affect when set to “1.”

LAV[4:0]

Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents

1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.

AVM

PCM Out Volume Mute. When this bit is set to “1,” both the left and the right channels are muted, unless the

MSPLT bit in Register 76h is set to “1,” in which case this mute bit will affect only the left channel.

AUX Volume Register (Index 16h)

Reg

No. Name

D15

D14 D13 D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

16h AUX Volume

AVM

X

X

LAV4 LAV3

LAV2

LAV1

LAV0

AVRM

* XX

RAV4 RAV3 RAV2 RAV1 RAV0 8808h

*For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.

If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table IV for examples.