LPC Interface Bridge Registers (D31:F0)
538 Datasheet
13.9.6 TCO1_CNT—TCO1 Control Register
I/O Address: TCOBASE +08h Attribute: R/W, R/WLO, R/WC
Default Value: 0000h Size: 16-bit
Lockable: No Power Well: Core
Bit Description
15:13 Reserved
12
TCO_LOCK — R/WLO. 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
TCO Timer Halt (TCO_TMR_HLT) — R/W.
0 = The TCO Timer is enabled to count.
1 = The TCO Timer will halt. It will not count, and thus cannot reach a value that will
cause an SMI# or set the SECOND_TO_STS bit. When set, this bit will prevent
rebooting and prevent Alert On LAN event messages from being transmitted on the
SMLink (but not Alert On LAN* heartbeat messages).
10 Reserved
9
NMI2SMI_EN — R/W.
0 = Normal NMI functionality.
1 = Forces all NMIs to instead cause SMIs. The functionality of this bit is dependent
upon the settings of the NMI_EN bit and the GBL_SMI_EN bit as detailed in the
following table:
8
NMI_NOW — R/WC.
0 = Software clears this bit by writing a 1 to it. The NMI handler is expected to clear
this bit. Another NMI will not be generated until the bit is cleared.
1 = Writing a 1 to this bit causes an NMI. This allows the BIOS or SMI handler to force
an entry to the NMI handler.
7:0 Reserved
NMI_EN GBL_SMI_EN Description
0b 0b No SMI# at all because GBL_SMI_EN = 0
0b 1b SMI# will be caused due to NMI events
1b 0b No SMI# at all because GBL_SMI_EN = 0
1b 1b No SMI# due to NMI because NMI_EN = 1
To Next Page
Loading...