AD1881 查看數據表（PDF） - Analog Devices

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AD1881

AC'97 SoundMAX® Codec

Analog Devices 

ANALOGDEVICESfAK-ON-DEHANDHOTLINE - Page 22

AD1881

PC Beep Register (Index OAh)

Reg NBD1e

015

Nwn

OAh PC_BEEP Vohu:ne PCM

014 013 012 011 010 09 08 07 06 05 04

03

02

01

DO DefaulT

X

X

X

X

X

XX

X PCV3 PCV2 PCVI PCVO X 8000h

PCV[3:0]

PCM

PC Beep Volume Control. The least significant bit represents 3 dB attenuation. This register controls the output

from 0 dB to a maximum attenuation of --45 dB. The PC Beep is routed to Left and Right line outputs even when

the RESET pin is asserted. This is so that Power on Self-Test (POST) codes can be heard by the user in case of a

hardware problem with the Pc.

PC Beep Mute. When this bit is set to "1," the channel is muted.

OBSOLETE PCM

0

0

1

. . . PCV3

PCVO

0000

1111

xxxx

Function

0 dB Attenuation

--45 dB Attenuation

-00 dB Attenuation

Phone Volume (Index OCh)

Reg

Nwn

NlUDe

015 014 013 012 011 010 09 08 07 06 OS 04 03 02 01 DO OefBu1

OCh Phone Vohu:ne

PHM X

X

X

X

X

XX

X PHV4 PHV3 PHYZ PHVI PHVO 8008h

PHV[4:0]

PHM

Phone Volume. Allows setting the Phone Volume Attenuator in 32 steps. The LSB represents 1.5 dB, and the

range is + 12 dB to -34.5 dB. The default value is 0 dB, mute enabled.

Phone Mute. When this bit is set to "1," the channel is muted.

MIC Volume (Index OEh)

Reg

Nwn

N BIDe

015 014 013 012 011 010 09 08 07 06 OS 04

03

02

01

00

OetBuIt

OEh Mic Volume MCM X X X X X X X X MIO X MCV4 MCV3 MCYZ MCVI MCVO 800Sh

MCV[4:0]

MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 steps. The LSB represents 1.5 dB, and the

range is + 12 dB to -34.5 dB. The default value is 0 dB, mute enabled.

M20

MCM

Microphone 20 dB Gain Block

= = 0 Disabled; Gain 0 dB.

= = 1 Enabled; Gain 20 dB.

MIC Mute. When this bit is set to "I," the channel is muted.

lineIn Volume (Index IOh)

Reg

Nwn

Nmne

015 014 013 012 011 010 09 08 07 06 05 04 03 02 01 DO OeCau1

10h Une InVolwne LM X X LLV4 LLV3 LLV2 LLVI LLVO X X X RLV4 RLV3 RLV2 RLVI RLVO 8808h

RLV[4:0]

ILV[4:0]

1M

Right line In Volume. Allows setting the line In right channel attenuator in 32 steps. The LSB represents 1.5 dB,

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

line In Volume Left. Allows setting the line In left channel attenuator in 32 steps. The LSB represents 1.5 dB,

and the 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," the channel is muted.

REV. 0

-13-

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