Intel J1850 FH8065301455200 User Manual

Datasheet

75

Thermal trip points are of two types:

•

Hard Trip: The Catastrophic trip points generated by DTS’s based on predefined 
temperature setting defined in fuses.

•

Programmable Trips: four programmable trip settings (Hot, Aux2, Aux1, Aux0) 
that can be set by firmware/software. Default value for Hot Trip is from Fuses.

DTS accuracy is around 8 

o

C under 60 

o

C and around 6

o

C above 60 

o

C.

Catastrophic trip is generated by DTS whenever the ambient temperature around it 
reaches (or extends) beyond the maximum value (indicated by a fuse). Catastrophic 
trip will not trip unless enabled (DTS are enabled only after HFPLL is locked). Within 
each DTS, Catastrophic trips are flopped to prevent any glitches on Catastrophic signals 
from affecting the processor behavior. Catastrophic trips are reset, once set, during 
power cycles. 

Catastrophic trip signals from all DTS in the processor are combined to generate 
THERMTRIP function, which will in turn shut off all the PLLs and power rails to prevent 
processor breakdown. To prevent glitches from triggering shutdown events, 
Catastrophic trips from DTS’s are registered before being sent out. 

Programmable trips can be programmed to cause different actions when triggered to 
reduce temperature of the die.

By default, the Aux 3 (Hot Trip) point is set by fuses but the software/firmware has an 
option to set these to a different value.

This trip point is enabled by firmware to monitor and control the system temperature 
while the rest of the system is being set up.

These are fully programmable trip points for general hardware protection mechanisms. 
The programmable trips are only active after software/firmware enables the trip. 

Unlike Aux3, the Aux[2:0] trip registers are defaulted to zero. To prevent spurious 
results, software/firmware should program the trip values prior to enabling the trip 
point.