82801BA Datasheet, PDF (284/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

LPC Interface Bridge Registers (D31:F0)
9.1.35
FUNC_DIS—Function Disable Register (LPC I/F—D31:F0)
Offset Address: F2h
Default Value: 00h
Lockable:
No
Attribute:
Size:
Power Well:
R/W
16-bit
Core
Bit
Description
15:9 Reserved
SMBus For BIOS (SMB_FOR_BIOS)—R/W. This bit is used in conjunction with bit 3 in this
register.
8
0 = No effect.
1 = Allows the SMBus I/O space to be accessible by software when bit 3 in this register is set. The
PCI configuration space is hidden in this case. Note that if bit 3 is set alone, the decode of both
SMBus PCI configuration and I/O space will be disabled.
7 Reserved
AC’97 Modem Disable (F6_Disable)—R/W. Software sets this bit to disable the AC’97 modem
controller function. BIOS must not enable I/O or memory address space decode, interrupt
6
generation or any other functionality for functions that are to be disabled.
0 = AC’97 Modem is enabled
1 = AC’97 Modem is disabled
AC’97 Audio Controller Disable (F5_Disable)—R/W. Software sets this bit to disable the AC’97
audio controller function. BIOS must not enable I/O or memory address space decode, interrupt
5
generation or any other functionality for functions that are to be disabled.
0 = AC’97 audio controller is enabled
1 = AC’97 audio controller is disabled
USB Controller 2 Disable (F4_Disable)—R/W. Software sets this bit to disable the USB Controller
#2 function. BIOS must not enable I/O or memory address space decode, interrupt generation or
4
any other functionality for functions that are to be disabled.
0 = USB Controller #2 is enabled
1 = USB Controller #2 is disabled
SMBus Controller Disable (F3_Disable)—R/W. Software sets this bit to disable the SMBus Host
Controller function. BIOS must not enable I/O or memory address space decode, interrupt
3
generation or any other functionality for functions that are to be disabled.
0 = SMBus controller is enabled
1 = SMBus controller is disabled
USB Controller 1 Disable (F2_Disable)—R/W. Software sets this bit to disable the USB Controller
#1 function. BIOS must not enable I/O or memory address space decode, interrupt generation or
2
any other functionality for functions that are to be disabled.
0 = USB Controller #1 is enabled
1 = USB Controller #1 is disabled
IDE Controller Disable (F1_Disable)—R/W. Software sets this bit to disable the IDE controller
function. BIOS must not enable I/O or memory address space decode, interrupt generation or any
1
other functionality for functions that are to be disabled.
0 = IDE controller is enabled
1 = IDE controller is disabled
0 Reserved.
9-22
82801BA ICH2 and 82801BAM ICH2-M Datasheet