STAC9766 Datasheet, PDF (77/97 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
Bit(s) Reset Value
Name
Description
15:13
0
RESERVED Bits not used, should read back 0
12
1
AC97MIX
0 = mixer record contains a mix of all mono and stereo analog input signals,
not the DAC (ALL ANALOG mode)
1 = mixer record contains a mix of all mono and stereo analog input signals
plus the DAC signal (AC97 mode)
This bit only has an effect when either Stereo Mix or Mono Mix is selected as
the record source in Reg. 1Ah.
The “ALL” mode is useful in conjunction with the POP BYPASS mode (Reg.
20h;D15) to record all analog sources, perform further processing in the
digital domain, including combining with other PCM data, and routing through
the DACs directly to Line Out, Headphone Out, or Mono Out.
A Stereo Mix recording will be affected by the setting of the 3D Effects bit
(Reg. 20h;D13)
11:7
0
RESERVED Bits not used, should read back 0
6
0
MUTEFIX
DISABLE
0 = MUTE FIX Enabled
1 = MUTE FIX Disabled
When this bit is zero, and either channel is set to -46.5dB attenuation, 1Fh,
then that channel is fully muted. When this bit is one, then operation is per
AC’97 specification.
5:4
0
ADCSLT1:0
Select slots for ADC data on ACLINK
00 = left slot 3, right slot 4
01 = left slot 7, right slot 8
10 = left slot 6, right slot 9
11 = left slot 10, right slot 11
3
0
RESERVED Reserved
Adds +10dB gain to the selected MIC input. Use in conjunction with
BOOSTEN (Reg. 0Eh;D6)
BOOSTEN MICGAINVAL
2
0
MIC GAIN VAL 0
0
= 0 dB
0
1
= 10 dB
1
0
= 20 dB
1
1
= 30 dB
Supply Override bit allows override of the supply detect.
1
0
SPLYOVR_EN
0 = no override on supply detect
1 = override supply detect with bit 0
Supply Override Value provides the analog voltage operation values.
SPLYOVR_VA
0
0
L
0 = force 3.3V operation
1 = force 5V operation
8.4.10. Analog Current Adjust (72h)
To unlock Register 72h, write 0xABBA to Register 70h.
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
D8
RESERVED
D7
D6
D5
D4
D3
D2
D1
D0
INT APOP
RESERVED
IDT™
77
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06