82801FB Datasheet, PDF (154/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
Table 5-27 shows which events can cause an SMI# and SCI. Note that some events can be
programmed to cause either an SMI# or SCI. The usage of the event for SCI (instead of SMI#) is
typically associated with an ACPI-based system. Each SMI# or SCI source has a corresponding
enable and status bit.
Table 5-27. Causes of SMI# and SCI (Sheet 1 of 2)
Cause^1-5
SCI SMI
Additional Enables
PME#
Yes Yes PME_EN=1
PME_B0 (internal EHCI controller) Yes Yes PME_B0_EN=1
PCI Express* PME Messages
PCI_EXP_EN=1
Yes Yes
(Not enabled for SMI)
HOT_PLUG_EN=1
PCI Express Hot Plug Message Yes Yes
(Not enabled for SMI)
Power Button Press
Yes Yes PWRBTN_EN=1
Power Button Override (Note 6) Yes No
None
RTC Alarm
Yes Yes RTC_EN=1
Ring Indicate
Yes Yes RI_EN=1
AC ’97 wakes
Yes Yes AC97_EN=1
USB#1 wakes
Yes Yes USB1_EN=1
USB#2 wakes
Yes Yes USB2_EN=1
USB#3 wakes
Yes Yes USB3_EN=1
USB#4 wakes
Yes Yes USB4_EN=1
THRM# pin active
Yes Yes THRM_EN=1
ACPI Timer overflow (2.34 sec.) Yes Yes TMROF_EN=1
Any GPI⁷
GPI[x]_Route=10 (SCI)
Yes Yes GPI[x]_Route=01 (SMI)
GPE0[x]_EN=1
TCO SCI Logic
Yes No
TCOSCI_EN=1
TCO SCI message from (G)MCH Yes No
none
TCO SMI Logic
No
Yes TCO_EN=1
TCO SMI — Year 2000 Rollover No
Yes none
TCO SMI — TCO TIMEROUT
No
Yes none
TCO SMI — OS writes to
TCO_DAT_IN register
No
Yes none
TCO SMI — Message from
(G)MCH
No
Yes none
TCO SMI — NMI occurred (and
NMIs mapped to SMI)
No
Yes NMI2SMI_EN=1
TCO SMI — INTRUDER# signal
goes active
No
Yes INTRD_SEL=10
TCO SMI — Change of the
BIOSWP bit from 0 to 1
No
Yes BLD=1
TCO SMI — Write attempted to
BIOS
No
Yes BIOSWP=1
Where Reported
PME_STS
PME_B0_STS
PCI_EXP_STS
HOT_PLUG_STS
PWRBTN_STS
PRBTNOR_STS
RTC_STS
RI_STS
AC97_STS
USB1_STS
USB2_STS
USB3_STS
USB4_STS
THRM_STS
TMROF_STS
GPI[x]_STS
GPE0_STS
TCOSCI_STS
MCHSCI_STS
TCO_STS
NEWCENTURY_STS
TIMEOUT
OS_TCO_SMI
MCHSMI_STS
NMI2SMI_STS
INTRD_DET
BIOSWR_STS
BIOSWR_STS
154
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet