Functional Description
Table 5-28. Causes of SMI# and SCI (Sheet 1 of 2)
Cause
SCI
Yes
SMI
Additional Enables
Where Reported
PME#
Yes
PME_EN=1
PME_STS
PME_B0 (Internal, Bus 0,
PME-Capable Agents)
Yes
Yes
Yes
Yes
PME_B0_EN=1
PME_B0_STS
PCI_EXP_STS
PCI_EXP_EN=1
PCI Express* PME Messages
(Not enabled for SMI)
HOT_PLUG_EN=1
PCI Express Hot Plug Message Yes
Yes
Yes
No
HOT_PLUG_STS
PWRBTN_STS
PRBTNOR_STS
(Not enabled for SMI)
Power Button Press
Yes
Yes
PWRBTN_EN=1
None
Power Button Override (Note
7)
RTC Alarm
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
RTC_EN=1
RI_EN=1
RTC_STS
Ring Indicate
USB#1 wakes
USB#2 wakes
USB#3 wakes
USB#4 wakes
USB#5 wakes
USB#6 wakes
THRM# pin active
RI_STS
USB1_EN=1
USB2_EN=1
USB3_EN=1
USB4_EN=1
USB5_EN=1
USB6_EN=1
THRM_EN=1
USB1_STS
USB2_STS
USB3_STS
USB4_STS
USB5_STS
USB6_STS
THRM_STS
ACPI Timer overflow (2.34
sec.)
Yes
Yes
TMROF_EN=1
TMROF_STS
GPI[x]_Route=10
(SCI)
GPI[x]_Route=01
(SMI)
GPI[x]_STS
GPE0_STS
Any GPI
Yes
Yes
GPE0[x]_EN=1
TCO SCI Logic
Yes
Yes
No
No
No
TCOSCI_EN=1
none
TCOSCI_STS
MCHSCI_STS
TCO SCI message from
(G)MCH
TCO SMI Logic
Yes
Yes
Yes
TCO_EN=1
none
TCO_STS
TCO SMI — Year 2000 Rollover No
NEWCENTURY_STS
TIMEOUT
TCO SMI — TCO TIMEROUT
No
No
none
TCO SMI — OS writes to
TCO_DAT_IN register
Yes
Yes
Yes
Yes
Yes
none
OS_TCO_SMI
MCHSMI_STS
NMI2SMI_STS
INTRD_DET
TCO SMI — Message from
(G)MCH
No
No
No
No
none
TCO SMI — NMI occurred (and
NMIs mapped to SMI)
NMI2SMI_EN=1
INTRD_SEL=10
BC.LE=1
TCO SMI — INTRUDER# signal
goes active
TCO SMI8 — Change of the
BIOSWP bit from 0 to 1
BIOSWR_STS
146
Datasheet
INTEL [ INTEL ]
