Audio Codec '97

AC ‘97 Component Specification Revision 2.3 Rev 1.0

The default value for the mono registers is 8008h, which corresponds to 0 dB gain with mute on. The default value

for stereo registers is 8808h, which corresponds to 0 dB gain with mute on.

Mute Gx4...Gx0 Function

0 00000 +12 dB gain

0 01000 0 dB gain

0 11111 -34.5 dB gain

1 xxxxx −∞ dB gain

Table 22. Mixer Input Gain/Atten

5.7.6 Record Select Control Register (Index 1Ah)

Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

1Ah Record Select X X X X X SL2 SL1 SL0 X X X X X SR2 SR1 SR0 0000h

This register is used to select the record source independently for right and left. See table for legend. Several of the

analog mixer inputs are optional, selecting an unimplemented analog input has undefined results.

The default value is 0000h, which corresponds to Mic in.

SR2...SR0 Right Record Source

0 Mic

1 CD In (R)

2 Video In (R)

3 Aux In (R)

4 Line In (R)

5 Stereo Mix (R)

6 Mono Mix

7 Phone

SL2...SL0 Left Record Source

0 Mic

1 CD In (L)

2 Video In (L)

3 Aux In (L)

4 Line In (L)

5 Stereo Mix (L)

6 Mono Mix

7 Phone

Table 23. Left, Right Record Select