CMI9738 Datasheet, PDF (22/36 Pages) List of Unclassifed Manufacturers – Integrated Multi-channel AC97

CMI 9738
Integrated Multi-channel AC‘97
Analog Mixer Input Gain Registers (Index 0Eh - 18h) (R/W)
Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0Eh Mic Volume Mute X X X RM3 RM2 RM1 RM0 X 20dB X X GN3 GN2 GN1 GN0 8008h
LineIn
10h
Mute X X X GL3 GL2 GL1 GL0 X X X X GR3 GR2 GR1 GR0 8808h
Volume
12h CD Volume Mute X X X GL3 GL2 GL1 GL0 X X X X GR3 GR2 GR1 GR0 8808h
16h Aux Volume Mute X X X GL3 GL2 GL1 GL0 X X X X GR3 GR2 GR1 GR0 8808h
PCM Out
18h
Mute X X X GL3 GL2 GL1 GL0 X X X X GR3 GR2 GR1 GR0 8808h
Vol
The MSB of the register is the mute bit. When this bit is set to 1 the level for that channel is set at
∞ dB.
Register 0Eh (Mic Volume Register) has an extra bit that is for a 20 dB boost. When bit 6 is set to 1
the 20 dB boost is on. The default value is 8008, which corresponds to 0 dB gain with mute on.
Mute Mx3...Mx0
Function
0
0000
0 dB Attenuation
0
0001
2dB Attenuation
0
1111
32dB Attenuation
1
xxxx
∞ dB Attenuation
Record Select Control Register (Index 1Ah) (R/W)
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
The default value is 0000h, which corresponds to Mic in.
SR2...SR0
Right Record Source
0
Mic
1
CD In (R)
2
N/A
3
Aux In (R)
4
Line In (R)
5
Stereo Mix (R)
6
Mono Mix
7
N/A
XXX
SL2...SL0
0
1
2
3
4
5
6
7
X SR2 SR1 SR0 0000h
Left Record Source
Mic
CD In (L)
N/A
Aux In (L)
Line In (L)
Stereo Mix (L)
Mono Mix
N/A
C-MEDIA Electronics Inc.
6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106
TEL: [phone] FAX: [phone] E-mail:[e-mail]
Revision Date Apr./2002
Revision 1.1