LPC Interface Bridge Registers (D31:F0)
9-76
Intel
82801BA ICH2 Datasheet
9.9.3
TCO1_TMR—TCO Timer Initial Value Register
I/O Address:
Default Value:
Lockable:
TCOBASE +01h
0004h
No
Attribute:
Size:
Power Well:
R/W
8-bit
Core
9.9.4
TCO1_DAT_IN—TCO Data In Register
I/O Address:
Default Value:
Lockable:
TCOBASE +02h
0000h
No
Attribute:
Size:
Power Well:
R/W
8-bit
Core
9.9.5
TCO1_DAT_OUT—TCO Data Out Register
I/O Address:
Default Value:
Lockable:
TCOBASE +03h
0000h
No
Attribute:
Size:
Power Well:
R/W
8-bit
Core
9.9.6
TCO1_STS—TCO1 Status Register
I/O Address:
Default Value:
Lockable:
TCOBASE +04h
0000h
No
Attribute:
Size:
Power Well:
R/WC RO
16-bit
Core
(Except bit 7, in RTC)
Bit
Description
7:6
Reserved
5:0
TCO Timer Initial Value.
Value that is loaded into the timer each time the TCO_RLD register is
written. Values of 0h–3h will be ignored and should not be attempted. The timer is clocked at
approximately 0.6 seconds, and this allows time-outs ranging from 2.4 seconds to 38 seconds.
Bit
Description
7:0
TCO Data In Value.
Data Register for passing commands from the OS to the SMI handler. Writes
to this register will cause an SMI and set the OS_TCO_SMI bit in the TCO_STS register.
Bit
Description
7:0
TCO Data Out Value.
Data Register for passing commands from the SMI handler to the OS.
Writes to this register will set the TCO_INT_STS bit in the TCO_STS register. It will also cause an
interrupt, as selected by the TCO_INT_SEL bits.
Bit
Description
15:13
Reserved
12
Hub Interface SERR Status (HUBSERR_STS)
—R/WC.
1 = ICH2 received an SERR# message via the hub interface. The software must read the memory
controller hub (or its equivalent) to determine the reason for the SERR#.
0 = Software clears this bit by writing a 1 to the bit position.
11
Hub Interface NMI Status (HUBNMI_STS)
—R/WC.
1 = ICH2 received an NMI message via the hub interface. The software must read the memory
controller hub (or its equivalent) to determine the reason for the NMI.
0 = Software clears this bit by writing a 1 to the bit position.
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