Intel i7-3612QM AV8063801130704 User Manual

Datasheet, Volume 1

87

Signal Description 

PREQ#

PREQ# is used by debug tools to request debug operation of the 

processor.

I

Asynchronous 

CMOS

TCK

TCK (Test Clock): This signal provides the clock input for the 

processor Test Bus (also known as the Test Access Port). TCK 

must be driven low or allowed to float during power on Reset.

I

CMOS

TDI

TDI (Test Data In): This signal transfers serial test data into 

the processor. TDI provides the serial input needed for JTAG 

specification support.

I

CMOS

TDO

TDO (Test Data Out): This signal transfers serial test data out 

of the processor. TDO provides the serial output needed for JTAG 

specification support.

O

Open Drain

TMS

TMS (Test Mode Select): A JTAG specification support signal 

used by debug tools.

I

CMOS

TRST#

TRST# (Test Reset): This signal resets the Test Access Port 

(TAP) logic. TRST# must be driven low during power on Reset. 

I

CMOS

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. 
On the processor, CATERR# is used for signaling the following 

types of errors:

• Legacy MCERRs – CATERR# is asserted for 16 BCLKs.
• Legacy IERRs – CATERR# remains asserted until warm or 

cold reset.

O

CMOS

PECI

PECI (Platform Environment Control Interface): A serial 

sideband interface to the processor, it is used primarily for 

thermal, power, and error management. 

I/O

Asynchronous

PROCHOT#

Processor Hot: 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 (TCC) has been 

activated, if enabled. This signal can also be driven to the 

processor to activate the TCC.

CMOS Input/

Open-Drain 

Output

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 130 °C. 

This is signaled to the system by the THERMTRIP# signal. 

O

Asynchronous 

CMOS