82801BA Datasheet, PDF (401/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

AC’97 Audio Controller Registers (D31:F5)
13.1.15 INTR_PN—Interrupt Pin Register (Audio—D31:F5)
Address Offset: 3Dh
Default Value: 02h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
This register indicates which PCI interrupt pin is used for the AC '97 module interrupt. The AC '97
interrupt is internally OR’ed to the interrupt controller with the PIRQB# signal.
Bit
Description
7:3 Reserved.
2:0 AC '97 Interrupt Routing—RO. Hardwired to 010b to select PIRQB#.
13.2 AC’97 Audio I/O Space (D31:F5)
The AC’97 I/O space includes Native Audio Bus Master Registers and Native Mixer Registers.
Table 13-2 shows the register addresses for the audio mixer registers.
Table 13-2. ICH2 Audio Mixer Register Configuration
Primary Secondary
offset
Offset
NAMBAR Exposed Registers (D31:F5)
00h
80h
Reset
02h
82h
Master Volume Mute
04h
84h
Headphone Volume Mute
06h
86h
Master Volume Mono Mute
08h
88h
Master Tone (R & L)
0Ah
8Ah
PC_BEEP Volume Mute
0Ch
8Ch
Phone Volume Mute
0Eh
8Eh
Mic Volume Mute
10h
90h
Line In Volume Mute
12h
92h
CD Volume Mute
14h
94h
Video Volume Mute
16h
96h
Aux Volume Mute
18h
98h
PCM Out Volume Mute
1Ah
9Ah
Record Select
1Ch
9Ch
Record Gain Mute
1Eh
9Eh
Record Gain Mic Mute
20h
A0h
General Purpose
22h
A2h
3D Control
24h
A4h
AC’97 RESERVED
26h
A6h
Powerdown Ctrl/Stat
28h
A8h
Extended Audio
2Ah
AAh
Extended Audio Ctrl/Stat
82801BA ICH2 and 82801BAM ICH2-M Datasheet
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