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6.9
Error and Thermal Protection
Table 6-11. Error and Thermal Protection
Signal Name
CATERR#
PECI
PROCHOT#
PSI#
THERMTRIP#
56
Description
Catastrophic Error: This signal indicates that the system
has experienced a catastrophic error and cannot continue
to operate. The processor will set this for non-recoverable
machine check errors or other unrecoverable internal
errors. Since this is an I/O pin, external agents are allowed
to assert this pin that will cause the processor to take a
machine check exception.
CATERR# is used for signaling the following types of errors:
• Legacy MCERR: CATERR# is asserted for 16 BCLKs.
• Legacy IERR: CATERR# remains asserted until warm or
cold reset.
PECI (Platform Environment Control Interface) is the serial
sideband interface to the processor and is used primarily
for thermal, power, and error management.
PROCHOT# goes active when the processor temperature
monitoring sensor(s) detects that the processor has
reached its maximum safe operating temperature. This
indicates that the processor Thermal Control Circuit has
been activated, if enabled. This signal can also be driven to
the processor to activate the Thermal Control Circuit. This
signal does not have on-die termination and must be
terminated on the system board.
Processor Power Status Indicator: This signal is asserted
when maximum possible processor core current
consumption is less than 15 A. Assertion of this signal is an
indication that the VR controller does not currently need to
be able to provide I
above 15 A, and the VR controller
CC
can use this information to move to more efficient
operating point. This signal will de-assert at least 3.3 s
before the current consumption will exceed 15 A. The
minimum PSI# assertion and de-assertion time is 1 BCLK.
Thermal Trip: The processor protects itself from
catastrophic overheating by use of an internal thermal
sensor. This sensor is set well above the normal operating
temperature to ensure that there are no false trips. The
processor will stop all execution when the junction
temperature exceeds approximately 125 °C. This is
signaled to the system by the THERMTRIP# pin.
Signal Description
Direction
Type
I/O
GTL
I/O
Asynch
Asynch
I/O
GTL
Asynch
O
CMOS
Asynch
O
GTL
Datasheet, Volume 1
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