STAC9766 Datasheet, PDF (56/97 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

STAC9766/9767
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
PC AUDIO
8.1.15. General Purpose (20h)
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
D8
POP BYP RESERVED
3D
RESERVED
MIX
MS
D7
D6
D5
D4
D3
D2
D1
D0
LOOPBACK
RESERVED
Bit(s)
15
14
13
12:10
9
8
7
6:0
Reset
Value
0
0
0
0
0
0
0
0
Name
POP BYPASS
RESERVED
3D
RESERVED
MIX
MS
LOOPBACK
RESERVED
Description
0 = Normal
1 = DAC bypasses mixer and connects directly to Line Out, Headphone
Out and Mono Out.
Bit not used, should read back 0
0 = 3D Effect Disabled
1 = 3D Effect Enabled
Bit not used, should read back 0
Mono Output select (0 = Mix, 1 = Mic)
Mic select (0 = Mic1, 1 = Mic2)
1 = Enables ADC to DAC loopback test
0 = Loopback Disabled
Do not send in conflicting data on AC-LINK while running this.
Bit not used, should read back 0
8.1.16. 3D Control (22h)
Default: 0000h
D15
D14
D13
D7
D6
D5
RESERVED
Bit(s) Reset Value
15:4
0
Name
RESERVED
3:2
0
DP3,DP2
1:0
0
RESERVED
D12
D11
D10
RESERVED
D4
D3
D2
DP3
DP2
Description
Bits not used, should read back 0
LINE_OUT SEPARATION RATIO
DP3 DP2 effect
0 0 0 ( OFF )
0 1 3 ( LOW )
1 0 4.5 ( MED )
1 1 6 ( HIGH )
Bits not used, should read back 0
D9
D8
D1
D0
RESERVED
This register is used to control the 3D stereo enhancement function, IDT Surround 3D (SS3D), built
into the AC'97 component. Note that register bits DP3-DP2 are used to control the separation ratios
in the 3D control for LINE_OUT. SS3D provides for a wider soundstage extending beyond the nor-
mal 2-speaker arrangement. Note that the 3D bit in the general purpose register (20h) must be set to
1 to enable SS3D functionality to allow the bits in 22h to take effect.
IDT™
56
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06