STAC9752A Datasheet, PDF (60/106 Pages) Integrated Device Technology – AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
PC AUDIO
Bit(s)
15
14
13
12:10
9
8
7
6:0
Reset
Value
0
0
0
0
0
0
0
0
Name
Description
POP BYPASS
Reserved
3D
Reserved
MIX
MS
LOOPBACK
Reserved
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 Loop Back Test
0 = Loopback Disabled
Do not send in conflicting data on AC-Link while running this.
Bit not used, should read back 0
7.1.16.
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
00
0 ( OFF )
01
3 ( LOW )
1 0 4.5 ( MED )
11
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, which allow the bits in register 22h to take effect.
The three separation ratios are implemented. The separation ratio defines a series of equations that
determine the amount of depth difference (High, Medium and Low) perceived during two-channel
playback. The ratios provide for options to narrow or widen the soundstage.
IDT™
60
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206