STAC9750 Datasheet, PDF (39/73 Pages) Integrated Device Technology – VALUE-LINE TWO-CHANNEL AC’97 CODECS

STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
Used to select the record source independently for right and left.
Bit(s)
15:11
Reset
0
10:8
0
7:3
0
2:0
0
Table 19. Record Select Control Registers
Name
Reserved
SL2:SL0
Reserved
SR2:SR0
Description
Bits not used, should read back 0
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
Bits not used, should read back 0
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
6.5.6.
Record Gain (1Ch)
Default: 8000h (corresponding to 0 dB gain with mute on)
D15
Mute
D7
D14
D13
D12
Reserved
D6
D5
D4
Reserved
D11
GL3
D3
GR3
D10
GL2
D2
GR2
D9
GL1
D1
GR1
D8
GL0
D0
GR0
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.
Mute
0
0
1
Table 20. Record Gain Registers
Gx3… Gx0
1111
0000
xxxx
+22.5 dB gain
0 dB gain
-∞ gain
Function
6.5.7.
General Purpose (20h)
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
D8
POP BYP RSRVD
3D
Reserved
MIX
MS
D7
D6
D5
D4
D3
D2
D1
D0
LPBK
Reserved
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
39
STAC9750/9751
V 5.8 103106