STAC9758 Datasheet, PDF (65/119 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
8.2.15. Record Gain (1Ch)
Default: 8000h (corresponding to 0 dB gain with mute on)
D15
Mute
D7
RMute
D14
D13
D12
RESERVED
D6
D5
D4
RESERVED
D11
GL3
D3
GR3
D10
GL2
D2
GR2
D9
GL1
D1
GR1
D8
GL0
D0
GR0
Bit(s) Reset Value R/W Name
Description
0 = no mute
1 = mute
15
1
RW
Mute
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
14:12
0
RO RESERVED Bits not used, should read back 0
LEFT ADC VOLUME CONTROL
00h = 0000 = 0 dB gain
11:8
0
RW GL<3:0> 01h = 0001 = +1.5 dB gain
....
0Fh = 1111 = +22.5 dB gain
Mutes Right Channel independent of Left Channel
0 = unmute
1 = muted
7
0
RW RMute The SPLITMUTE bit (Reg 72 (Page 0), 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.
6:4
0
RO RESERVED Bits not used, should read back 0
RIGHT ADC VOLUME CONTROL
00h = 0000 = 0 dB gain
3:0
0
RW GR<3:0> 01h = 0001 = +1.5 dB gain
....
0Fh = 1111 = +22.5 dB gain
Note: Most signals coming from external line-level sources will not need any additional gain.
Signals coming from the MicMux (see Reg 66h) will have the Mic Boost values (0, 10, 20, or 30
dB) added to the values indicated by the GL and GR bits in Reg 1Ch
IDT™
65
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206