82801BA Datasheet, PDF (414/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

AC’97 Modem Controller Registers (D31:F6)
14.1.7
SCC—Sub Class Code Register (Modem—D31:F6)
Address Offset: 0Ah
Default Value: 03h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
Bit
Sub Class Code Value—RO.
7:0
03h = Generic Modem.
Description
14.1.8
BCC—Base Class Code Register (Modem—D31:F6)
Address Offset: 0Bh
Default Value: 07h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
Bit
Description
Base Class Code Value—RO.
7:0
07h = Simple Communications Controller.
14.1.9
HEDT—Header Type Register (Modem—D31:F6)
Address Offset: 0Eh
Default Value: 00h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
Bit
7:0
Header Value—RO.
Description
14.1.10
MMBAR—Modem Mixer Base Address Register
(Modem—D31:F6)
Address Offset: 10h–13h
Default Value: 00000001h
Attribute:
Size:
R/W
32 bits
The Native PCI Mode Modem uses PCI Base Address register #1 to request a contiguous block of
I/O space that is to be used for the Modem Mixer software interface. The mixer requires 256 bytes
of I/O space. All accesses to the mixer registers are forwarded over the AC-link to the codec where
the registers reside.
In the case of the split codec implementation accesses to the different codecs are differentiated by
the controller by using address offsets 00h–7Fh for the primary codec and address offsets 80h–FEh
for the secondary codec.
14-4
82801BA ICH2 and 82801BAM ICH2-M Datasheet