STAC9750 datasheet(39/73 Pages) IDT

39 / 73 page

STAC9750/9751

VALUE-LINE TWO-CHANNEL AC’97 CODECS

PC AUDIO

IDT™

STAC9750/9751

V 5.8 103106

VALUE-LINE TWO-CHANNEL AC’97 CODECS

Used to select the record source independently for right and left.

6.5.6.

Record Gain (1Ch)

Default: 8000h (corresponding to 0 dB gain with mute on)

The 1Ch register adjusts the stereo input record gain. Each step corresponds to 1.5dB. 22.5dB cor-

responds to 0F0Fh. The MSB of the register is the mute bit. When this bit is set to 1, the level for that

channel(s) is set at -

∞dB.

6.5.7.

General Purpose (20h)

Default: 0000h

Table 19. Record Select Control Registers

Bit(s)

Reset

Name

Description

15:11

Reserved

Bits not used, should read back 0

10:8

SL2:SL0

Left Channel Input Select

000 = Mic

001 = CD In (left)

010 = Video In (left)

011 = Aux In (left)

100 = Line In (left)

101 = Stereo Mix (left)

110 = Mono Mix

111 = Phone

7:3

Reserved

Bits not used, should read back 0

2:0

SR2:SR0

Right Channel Input Select

000 = Mic

001 = CD In (right)

010 = Video In (right)

011 = Aux In (right)

100 = Line In (right)

101 = Stereo Mix (right)

110 = Mono Mix

111 = Phone

D15

D14

D13

D12

D11

D10

Mute

Reserved

GL3

GL2

GL1

GL0

Reserved

GR3

GR2

GR1

GR0

Table 20. Record Gain Registers

Mute

Gx3… Gx0

Function

1111

+22.5 dB gain

0000

0 dB gain

1xxxx

∞ gain

D15

D14

D13

D12

D11

D10

POP BYP

RSRVD

Reserved

MIX

LPBK

Reserved

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