Intel G870 CM8062307260115 User Manual

60

Datasheet, Volume 1

CATERR#

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.

I/O

GTL

PECI

PECI (Platform Environment Control Interface) is the serial 

sideband interface to the processor and is used primarily 

for thermal, power, and error management. 

I/O

Asynch

PROCHOT#

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.

I/O

Asynch GTL

PSI#

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

CC

 above 15 A, and the VR controller 

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.

O

Asynch 

CMOS

THERMTRIP#

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. 

O

Asynch GTL