EP80579 Datasheet, PDF (1090/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Note:
Note:
27.8.6
27.8.7
If the processor is running extremely hot and is heating up, it is possible (although very
unlikely) that components around it, such as the IICH, are no longer executing cycles
properly. Therefore, if THRMTRIP# goes active, and IICH is relying on state machine
logic to perform the power down, the state machine may not be working, and the
system will not power down.
CMI will follow this flow for THRMTRIP#.
1. At boot (PLTRST# low), THRMTRIP# ignored.
2. After power-up (PLTRST# high), if THRMTRIP# sampled active, SLP_S3#,
SLP_S4#, and SLP_S5# fire, and normal sequence of sleep machine starts.
3. Until sleep machine enters the S5 state, SLP_S3#, SLP_S4#, and SLP_S5# stay
active, even if THRMTRIP# is now inactive. This is the equivalent of “latching” the
thermal trip event.
4. When S5 state reached, go to step #1, otherwise stay here. If CMI never gets to
S5, CMI does not reboot until power is cycled.
During boot, THRMTRIP# is ignored until SLP_S3#, PWROK, VRMPWRGD, and PLTRST#
are all ‘1’. During entry into a powered-down state (due to S3,S4, S5 entry, power cycle
reset, etc.) THRMTRIP# is ignored until either SLP_S3# = 0, or PWROK = 0, or
VRMPWRGD = 0.
A processor thermal trip event will
1. Set the AFTERG3_EN bit
2. Clear the PWRBTN_STS bit
3. Clear all the GPE0_EN register bits
4. Clear the SMB_WAK_STS bit only if SMB_WAK_STS was set due to SMBus slave
receiving message and not set due to SMBAlert.
The THRMTRIP# pin must be glitch free.
SATA SCI
The SATA logic can cause an SCI, but not an SMI or wake event. When the SATA logic
causes an SCI, the SATA_SCI_STS bit will be set. The SCI handler enables the SCI and
clears the SCI via bits in the SATA unit.
PCI Express* PME Event Message
PCI Express* ports and the IMCH have the ability to cause PME using messages. When
a PME messages is receive, CMI will set the PCI-EXP-STS bit.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1090
August 2009
Order Number: 320066-003US