Thermal Alert - Intel BX80569Q9550 - Core 2 Quad 2.83 GHz Processor Datasheet

A Corrected Machine Check Interrupt (CMCI) is issued when processor enters
and exits SIM.
If T>= T
factor maximum limit is already reduced, then the thermal management
system will assert PROCHOT_N and the processor will enter Single Issue Mode
(SIM) and transition to the lowest P-state.
The Intel
9500 Series will remain in this low power mode until the temperature
decreases and drops below (TPROCHOT - THYSTERESIS). The processor will be
in this low power mode for a minimum of 1 second and after 1 second will
resume normal operation as soon as the temperature has decreased
sufficiently.
c. If T>=T
will remain asserted; the thermal management controller becomes non-
functional. The processor cannot recover except via cold reset. The processor
will continue to throttle if T>=T
Data integrity is not guaranteed beyond T
d. If T>= T
THERMTRIP_N and halt processor clocks.
T
Cold reset is required to recover.
5.1.2.2 Implementation
The Intel
thermal management features are designed to operate independently of software,
including the operating system. The thermal sensors are on the die of the processor
and the frequency and voltage control resides completely on the processor. In order to
reduce the processor power while throttling, some execution units on the processor are
shut down, limiting the processor to executing only one instruction per cycle.
When the PROCHOT threshold is crossed and the processor enters low power mode, a
CMCI is sent to the OS and to the System Abstraction Layer (SAL). This interrupt is
sent out when entering throttling (CMCI entry) and also when the processor is exiting
the SIM phase (CMCI exit) to inform the system of the performance status. Note that
the temperature could cool below the throttle trip point but exiting SIM is still subject to
the minimum time of 1 second. Information on the CMCI interrupt can be found in the
®
Intel Itanium
There is a mechanism to bypass the PROCHOT setpoint. When it is bypassed, both the
THERMALERT_N and THERMTRIP_N signals, as well as THERMWARN threshold, still
operate as normal. There is also a mode that emulates PROCHOT setpoint for testing.
The processor can be placed in this mode by a Processor Abstraction Layer (PAL) call.
Another PAL call will return the processor to normal operation. These special modes are
intended for debug purposes only.
5.1.3

Thermal Alert

THERMALERT_N is a programmable thermal alert signal which is part of the Intel Intel
®
Itanium
management system. THERMALERT_N is asserted when the measured temperature
from the processor's digital thermometer (DT) is equal to or exceeds
QR_CSR_IPF_THERM_CONFIG.thermalert_assert_hot_thresh below PROCHOT.
THERMALERT_N will deassert after the DT readout is below PROCHOT by the sum of the
values in QR_CSR_IPF_THERM_CONFIG.thermalert_assert_hot_thresh and
136
the Intel® Itanium® Processor 9500 Series and the activity
PROCHOT
® ®
Itanium Processor 9300 Series and Intel
, then the processor will issue a fatal MCA and PROCHOT_N
THERMWARN
, then the thermal management system will assert
THERMTRIP
is enforced to prevent physical damage to the processor.
THERMTRIP
® Itanium ® Processor 9300 Series and Intel
®
Processor Family Interrupt Architecture Guide.
Processor 9300 Series and Intel
when it comes out of reset.
PROCHOT
THERMWARN
® Itanium
® ®
Itanium Processor 9500 Series' thermal
® ®
Intel Itanium Processor 9300 Series and 9500 Series Datasheet
Thermal Specifications
® ®
Itanium Processor
.
® Processor 9500 Series
®