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324

Datasheet, Volume 2

This register indicates the various error status.

31:16

RO

0h

15:8

ROS-V

00h

Powergood

Fault Record Index (FRI) 
This field is valid only when the PPF field is set.
The FRI field indicates the index (from base) of the fault 

recording register to which the first pending fault was recorded 

when the PPF field was set by hardware.
The value read from this field is undefined when the PPF field is 

clear.

7

RO

0h

6

RO

0b

Uncore

Invalidation Time-out Error (ITE) 
Hardware detected a Device-IOTLB invalidation completion 

time-out. At this time, a fault event may be generated based on 

the programming of the Fault Event Control register.
Hardware implementations not supporting device Device-

IOTLBs implement this bit as RsvdZ.

5

RO

0b

Uncore

Invalidation Completion Error (ICE) 
Hardware received an unexpected or invalid Device-IOTLB 

invalidation completion. This could be due to either an invalid 

ITag or invalid source-id in an invalidation completion response. 

At this time, a fault event may be generated based on the 

programming of the Fault Event Control register.
Hardware implementations not supporting Device-IOTLBs 

implement this bit as RsvdZ.

4

RW1CS

0b

Powergood

Invalidation Queue Error (IQE) 
Hardware detected an error associated with the invalidation 

queue. This could be due to either a hardware error while 

fetching a descriptor from the invalidation queue, or hardware 

detecting an erroneous or invalid descriptor in the invalidation 

queue. At this time, a fault event may be generated based on 

the programming of the Fault Event Control register.
Hardware implementations not supporting queued invalidations 

implement this bit as RsvdZ. 

3

RO

0b

Uncore

Advanced Pending Fault (APF) 
When this field is clear, hardware sets this field when the first 

fault record (at index 0) is written to a fault log. At this time, a 

fault event is generated based on the programming of the Fault 

Event Control register.
Software writing 1 to this field clears it. Hardware 

implementations not supporting advanced fault logging 

implement this bit as RsvdZ.