307013-003 Datasheet, PDF (157/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Functional Description
In systems using the APIC, the SCI can be routed to interrupts 9, 10, 11, 20, 21, 22, or
23. The interrupt polarity changes depending on whether it is on an interrupt shareable
with a PIRQ or not (see Section 10.1.14). The interrupt remains asserted until all SCI
sources are removed.
Table 5-28 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 5-28. Causes of SMI# and SCI (Sheet 1 of 2)
Cause^1-5
SCI SMI Additional Enables
Where Reported
PME#
Yes Yes PME_EN=1
PME_STS
PME_B0 (internal EHCI
controller)
Yes Yes PME_B0_EN=1
PME_B0_STS
PCI Express* PME Messages
(Desktop and Mobile)
Yes
Yes
PCI_EXP_EN=1
(Not enabled for SMI)
PCI_EXP_STS
PCI Express Hot Plug
Message (Desktop and
Mobile)
Yes Yes
HOT_PLUG_EN=1
(Not enabled for SMI)
HOT_PLUG_STS
Power Button Press
Power Button Override⁶)
Yes Yes PWRBTN_EN=1
Yes No
None
PWRBTN_STS
PRBTNOR_STS
RTC Alarm
Yes Yes RTC_EN=1
RTC_STS
Ring Indicate
Yes Yes RI_EN=1
RI_STS
AC ’97 wakes (Desktop and
Mobile)
Yes
Yes
AC97_EN=1
AC97_STS
USB#1 wakes
Yes Yes USB1_EN=1
USB1_STS
USB#2 wakes
Yes Yes USB2_EN=1
USB2_STS
USB#3 wakes
Yes Yes USB3_EN=1
USB3_STS
USB#4 wakes
Yes Yes USB4_EN=1
USB4_STS
THRM# pin active
Yes Yes THRM_EN=1
THRM_STS
ACPI Timer overflow (2.34
sec.)
Yes
Yes
TMROF_EN=1
TMROF_STS
Any GPI⁷
GPI[x]_Route=10 (SCI) _{GPI[x]_STS}
Yes Yes GPI[x]_Route=01 (SMI)
GPE0[x]_EN=1
GPE0_STS
TCO SCI Logic
Yes No
TCOSCI_EN=1
TCOSCI_STS
TCO SCI message from
(G)MCH
Yes No
none
MCHSCI_STS
TCO SMI Logic
No
Yes TCO_EN=1
TCO_STS
TCO SMI — Year 2000
Rollover
No
Yes none
NEWCENTURY_STS
TCO SMI — TCO TIMEROUT No
Yes none
TIMEOUT
TCO SMI — OS writes to
TCO_DAT_IN register
No
Yes none
OS_TCO_SMI
TCO SMI — Message from
(G)MCH
No
Yes none
MCHSMI_STS
Intel ^® ICH7 Family Datasheet
157