EP80579 Datasheet, PDF (1914/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Note:
50.2.2
50.2.2.1
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 the S5 state reached, return to step 1 above, otherwise stay here. If the
EP80579 never gets to S5, the EP80579 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 any of the following occurs:
• SLP_S3# = 0
• PWROK = 0
• VRMPWRGD = 0
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.
Thermal Sensor Features
PROCHOT# is asserted when the silicon temperature has reached the maximum
operating limit. If the EP80579 reaches the trip temperature indicated in Table 50-1,
“EP80579 Thermal Design Power (TDP) and Maximum Case Temperature Specifications
(TC-MAX)” , then PROCHOT# is asserted and the EP80579 initiates a SMI# or SCI.
PROCHOT# provides platform visibility of a thermal condition determined by the
thermal sensor. PROCHOT# should be implemented in the platform design as a thermal
warning, by initiating passive cooling, turning on fans or power management.
When PROCHOT# is asserted, Intel recommends that power management software
begins a processor-initiated passive cooling routine, which is described in Section
50.2.2.2, “Processor Passive Cooling”.
For platform thermal sensor designs, on-demand throttling is provided. Section
50.2.2.3, “On-Demand Passive Cooling” provides more information.
PROCHOT# Control Sequence
The PROCHOT# signal is a status output pin from the thermal sensor. The signal
indicates that the EP80579 has reached the maximum operating limit. When this
maximum operating temperature is reached, power management software or pre-boot
firmware should take action to reduce the temperature. The EP80579 follows these
behaviors with regard to the PROCHOT# signal:
• Based on the PROCHOT# signal activation, the EP80579 generates an SMI# or SCI
(depending on SCI_EN).
• If the PROCHOT_POL bit is set low, when PROCHOT# goes low, the PROCHOT_STS
bit will be set. This indicates that the thermal threshold has been exceeded. If the
PROCHOT_EN bit is set, then when PROCHOT_STS goes active, either an SMI# or
SCI# will be generated (depending on the SCI_EN bit being set). The power
management software (pre-boot firmware or ACPI) can then take measures to start
reducing the temperature. Examples include shutting unneeded subsystems or
halting the processor. Another method to reduce the temperature is processor-
Intel^® EP80579 Integrated Processor Product Line Datasheet
1914
August 2009
Order Number: 320066-003US