LPC Interface Bridge Registers (D31:F0)
9-22
Intel
82801BA ICH2 Datasheet
9.1.35
FUNC_DIS—Function Disable Register (LPC I/F—D31:F0)
Offset Address:
Default Value:
Lockable:
F2h
00h
No
Attribute:
Size:
Power Well:
R/W
16-bit
Core
Bit
Description
15:9
Reserved
8
SMBus For BIOS (SMB_FOR_BIOS)
—R/W.
This bit is used in conjunction with bit 3 in this
register.
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
6
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
generation or any other functionality for functions that are to be disabled.
0 = AC’97 Modem is enabled
1 = AC’97 Modem is disabled
5
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
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
4
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
any other functionality for functions that are to be disabled.
0 = USB Controller #2 is enabled
1 = USB Controller #2 is disabled
3
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
generation or any other functionality for functions that are to be disabled.
0 = SMBus controller is enabled
1 = SMBus controller is disabled
2
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
any other functionality for functions that are to be disabled.
0 = USB Controller #1 is enabled
1 = USB Controller #1 is disabled
1
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
other functionality for functions that are to be disabled.
0 = IDE controller is enabled
1 = IDE controller is disabled
0
Reserved.
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