STAC9766 Datasheet, PDF (79/97 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
8.4.12. High Pass Filter Bypass (78h*)
To unlock portion of Register 78h, write 0xABBA to Register 76h.
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
RESERVED
D7
D6
D5
D4
D3
D2
D1
RESERVED
Bit(s) Reset Value
Name
Description
15:1
0
RESERVED Bits not used, should read back 0
0
0
ADC HPF BYP
0 = Normal operation, (ADC High Pass Filter active)
1 = ADC High Pass Filter Bypass
D8
D0
ADC HPF BYP
8.4.13. Stereo Mic Enable Register (78h*)
To unlock portion of Register 78h, write 0x7272 to Register 72h.
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
D8
RESERVED
D7
D6
D5
D4
D3
D2
D1
D0
RSVD
STEREO_
MIC
RESERVED
Bit(s) Reset Value
Name
Description
15:7
0
RESERVED Bits not used, should read back 0
6
0
STEREO_MIC
0 = Stereo Mic Disabled (default)
1 = Stereo Mic Enabled
8.5. Vendor ID1 and ID2 (Index 7Ch and 7Eh)
These two registers contain four 8-bit ID codes. The first three codes have been assigned by
Microsoft using their Plug and Play Vendor ID methodology. The fourth code is a IDT, Inc. assigned
code identifying the STAC9766/9767. The ID1 register (index 7Ch) contains the value 8384h, which
is the first (83h) and second (84h) bytes of the Microsoft ID code. The ID2 register (index 7Eh) con-
tains the value 7666h, which is the third (76h) byte of the Microsoft ID code, and 66h which is the
STAC9766/9767 ID code.
IDT™
79
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06