AD1881 查看數據表（PDF） - Analog Devices

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AD1881

AC'97 SoundMAX® Codec

Analog Devices 

ANALOGDEVICESfAX-ON-DEMANDHOTLINE - Page 25

AD1881

General Purpose Register (Index 20h)

Reg NBlDe

NUID

ZOh General Purpose

D15 D14 D13 DU

POP X 3D X

Dl1 Dl0 D9 D8

X X MIX MS

D7 D6 D5 D4 D3 DZ Dl DO Default

LPBK X X X X X X X OOOOh

Note: This register should be read before writing to generate a mask for only the bites) that need to be changed. The function de-

fault value is OOOOhwhich is all off.

LPBK

Loopback Control. ADC/DAC Digital Loopback Mode

MS

MIC Select

0 =MIC!.

1 =MIC2.

OBSOLETE MIX

Mo0n=o MOiuxt.put Select

1 = MIe.

3D

3D Fhat Stereo Enhancement

= 0 Fhat Stereo is off.

= 1 Fhat Stereo is on.

POP

PCM Output Path and Mute. The POP bit controls the optional PCM out 3D bypass path (the pre- and post-3D

= PCM out paths are mutually exclusive).

0 pre-3D.

= 1 post-3D.

3D Control Register (Index 22h)

Reg

NUID

NBlDe

ZZh* 3D Control

D15 D14 DU D1Z Dl1 Dl0 D9 D8 D7 D6 D5 D4 D3 DZ Dl DO Default

X X X X X X X X X X X X DP3 DPZ DPI DPO OOOOh

DP[2:0]

Depth Control. Sets 3D "Depth" Phat Stereo enhancement according to table below.

DP3 . . . DPO

Depth

0000

0001

0%

6.67%

1110

1111

93.33%

100%

-16-

REV. 0

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