Intel N2820 FH8065301616603 データシート
製品コード
FH8065301616603
Datasheet
1043
PCU - Power Management Controller (PMC)
20.7.15
TCO_TMR: TCO Timer Register (TCO_TMR)—Offset 70h
Access Method
Default: 00040000h
§ §
Bit
Range
Default &
Access
Description
31:22
0b
RO
reserved: Reserved.
21:20
0b
RW
OS_POLICY (os_policy): OS-based software writes to these bits to select the policy
that the BIOS will use after the platform resets due the WDT. The following convention is
recommended for the BIOS and OS: 00 Boot normally 01 Shut down 10 Dont load OS.
Hold in pre-boot state and use LAN to determine next step 11 Reserved
19:13
0b
RO
reserved (reserved2): Reserved.
12
0b
RW
TCO Lock (TCO_LOCK) (tco_lock): When set to 1, this bit prevents writes from
changing the TCO_EN bit (in offset 30h of Power Management I/O space). Once this bit
is set to 1, it can not be cleared by software writing a 0 to this bit location. A core-well
reset is required to change this bit from 1 to 0. This bit defaults to 0.
11
0b
RW
TCO Timer Halt (TCO_TMR_HALT) (tco_tmr_halt): 1 = The TCO timer will halt. It
will not count, and thus cannot reach a value that would cause an SMI# or to cause the
SECOND_TO_STS bit to be set. This will also prevent rebooting. 0 = The TCO timer is
enabled to count. This is the default.
10:0
0b
RO
reserved1: Reserved.
Type: I/O Register
(Size: 32 bits)
TCO_TMR: [ACPI_BASE_ADDRESS] + 70h
ACPI_BASE_ADDRESS Type: PCI Configuration Register (Size:
32 bits)
ACPI_BASE_ADDRESS Reference: [B:0, D:31, F:0] + 40h
ACPI_BASE_ADDRESS Reference: [B:0, D:31, F:0] + 40h
31
28
24
20
16
12
8
4
0
0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
re
se
rv
ed
1
tc
o
_
tr
ld
_
va
l
re
se
rv
ed
Bit
Range
Default &
Access
Description
31:26
0b
RO
reserved (reserved1): Reserved.
25:16
004h
RW
TCO Timer reload value (TCO_TRLD_VAL) (tco_trld_val): Value that is loaded into
the timer each time the TCO_RLD register is written. Values of 0000h or 0001h will be
ignored and should not be attempted. The timer is clocked at approximately 0.6
seconds, and thus allows timeouts ranging from 1.2 second to 613.8 seconds. Note: The
timer has an error of +/- 1 tick (0.6s). The TCO Timer will only count down in the S0
state.
15:0
0b
RO
reserved: Reserved.