Functional Description
164 Datasheet
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 13.1.3). The interrupt remains asserted until all SCI
sources are removed.
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 SCI SMI Additional Enables Where Reported
PME# Yes Yes PME_EN=1 PME_STS
PME_B0 (Internal, Bus 0, PME-
Capable Agents)
Yes Yes PME_B0_EN=1 PME_B0_STS
PCI Express* PME Messages Yes Yes
PCI_EXP_EN=1
(Not enabled for SMI)
PCI_EXP_STS
PCI Express Hot Plug Message Yes Yes
HOT_PLUG_EN=1
(Not enabled for SMI)
HOT_PLUG_STS
Power Button Press Yes Yes PWRBTN_EN=1 PWRBTN_STS
Power Button Override (Note 7) Yes No None PRBTNOR_STS
RTC Alarm Yes Yes RTC_EN=1 RTC_STS
Ring Indicate Yes Yes RI_EN=1 RI_STS
ACPI Timer overflow (2.34 sec.) Yes Yes TMROF_EN=1 TMROF_STS
Any GPI[15:0] Yes Yes
GPI[x]_Route=10;
GPI[x]_EN=1
(SCI)
GPI[x]_Route=01;
ALT_GPI_SMI[x]_EN=1
(SMI)
GPI[x]_STS
ALT_GPI_SMI[x]_STS
GPIO[27] Yes Yes GP27_EN=1 GP27_STS
TCO SCI Logic Yes No TCOSCI_EN=1 TCOSCI_STS
TCO SCI message from processor Yes No none CPUSCI_STS
TCO SMI Logic No Yes TCO_EN=1 TCO_STS
TCO SMI
– 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 processor No Yes none CPUSMI_STS
TCO SMI
– NMI occurred (and NMIs
mapped to SMI)
No Yes NMI2SMI_EN=1 NMI2SMI_STS
TCO SMI
– INTRUDER# signal goes
active
No Yes INTRD_SEL=10 INTRD_DET
TCO SMI
– Change of the BIOSWE
(D31:F0:DCh, Bit 0) bit from 0 to 1
No Yes BLE=1 BIOSWR_STS
TCO SMI
– Write attempted to BIOS No Yes BIOSWE=1 BIOSWR_STS
BIOS_RLS written to Yes No GBL_EN=1 GBL_STS
GBL_RLS written to No Yes BIOS_EN=1 BIOS_STS
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