STAC9758 Datasheet, PDF (57/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
8.2.8.2. Mic Volume Register in Stereo Mode (Reg 0Eh)
Enabled when Stereo Mic Enable Bit (STMICEN), Reg 72h, Page 0, Bit D0 = 1
Default: 8008h.
D15
LMute
D7
RMute
D14
D13
RESERVED
D6
D5
BOOSTEN RESERVED
D12
GNL4
D4
GNR4
D11
GNL3
D3
GN3
D10
GNL2
D2
GNR2
D9
GNL1
D1
GNR1
D8
GNL0
D0
GNR0
Bit(s) Reset Value R/W Name
Description
0 = no mute
1 = mute
15
1
RW
LMute
The channels to be affected are determined by the SPLITMUTE bit
(Reg 72, Page 0, D6)
If SPLITMUTE = 0, both Left and Right channels are muted
If SPLITMUTE = 1, only the Left Channel is muted
14:13
0
RO RESERVED Bit not used, should read back 0
STEREO Mic Left Volume Control
00h = 00000b = +12.0 dB gain
01h = 00001b = +10.5 dB gain
12:8
0
RW GNL<4:0> .....
08h = 01000b = 0 dB - unity gain
.....
1Fh = 11111b = -34.5 dB attenuation
Mutes Right Channel independent of Left Channel
0 = unmute
1 = muted
7
0
RW RMute The SPLITMUTE bit (Reg 72, Page 0, Bit D6) must be set to 1 in order for
the RMute bit to have an effect on the sound.
The RMute bit is R/W. The RMute bit may be written and read regardless
of the state of the SPLITMUTE bit.
Turns on 20dB of boost in the Microphone Preamp
Works in conjunction with MICGAINVAL (Register 6Eh, Page 0, Bit D2)
which provides a 10dB boost in the Microphone preamp.
6
0
RW
BOOSTEN
BOOSTEN
0
MICGAINVAL
0
= 0 dB
0
1
= 10 dB
1
0
= 20 dB
1
1
= 30 dB
5
0
RO RESERVED Bit not used, should read back 0
STEREO Mic Right Channel Volume Control
00h = 00000b = +12.0 dB gain
01h = 00001b = +10.5 dB gain
4:0
0
RW GNR<4:0> .....
08h = 01000b = 0 dB - unity gain
.....
1Fh = 11111b = -34.5 dB attenuation
IDT™
57
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206