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AD1985

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Line In Volume (Index 0x10)

Reg Num

Name

D15 D14 D13 D12 D11 D10 D9

D6 D5 D4

Default

0x10

Line In Volume

LLV4 LLV3 LLV2 LLV1 LLV0 LVRM1

RLV4 RLV3 RLV2 RLV1 RLV0 0x8808

1 For AC ’97 compatibility, Bit D7 (LVRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right

channels.

RLV[4:0]

Right Line In Volume. Allows setting the line in right channel gain/attenuator to one of 32 levels. The LSB

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

LVRM

Right Channel Mute. Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel

separately from the LM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1.

LLV[4:0]

Line In Volume Left. Allows setting the line in left channel gain/attenuator to one of 32 levels. The LSB

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

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

Volume Settings for Line In, CD Volume, AUX, and PCM Out

Reg. 0x76

Control Bits

Line In (0x10), CD (0x12), AUX (0x16), and PCM Out (0x18)

Left Channel Volume D[12:8]

Right Channel Volume D[4:0]

MSPLT1

D15

Write

Readback

Function

D71

Write

Readback

Function

0 0000

12 dB Gain

0 0000

12 dB Gain

0 1000

0 dB Gain

0 1000

0 dB Gain

1 1111

–34.5 dB Gain

1 1111

–34.5 dB Gain

x xxxx

–∞ dB Gain, Muted

x xxxx

–∞ dB Gain, Muted

1 1111

–34.5 dB Gain

x xxxx

–∞ dB Gain, Only Right Muted

x xxxx

–∞ dB Gain, Only Left Muted

1 1111

–34.5 dB Gain

x xxxx

–∞ dB Gain, Left Muted

x xxxx

–∞ dB Gain, Right Muted

1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels. If

MSPLT is not set, RM bit has no effect.

Note that the x in the above table is a wild card, meaning the value has no effect.

CD Volume Register (Index 0x12)

Reg Num

Name

D15 D14 D13 D12

D11

D10

D6 D5 D4

Default

0x12

CD Volume

CM X

LCV4 LCV3 LCV2 LCV1 LCV0 CDRM1

RCV4 RCV3 RCV2 RCV1 RCV0 0x8808

1 For AC97 compatibility, Bit D7 (CDRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right

channels. See the Volume Settings for Line In, CD Volume, AUX, and PCM Out table.

RCV[4:0]

Right CD Volume. Allows setting the CD right channel gain/attenuator to one of 32 levels. The LSB represents

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

CDRM

Right Channel Mute. Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel

separately from the CM 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 gain/attenuator to one of 32 levels. The LSB represents

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

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

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