HP A2Y15AV Manuale Utente

326

Datasheet, Volume 2

This register specifies the fault event interrupt message control bits.

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Interrupt Mask (IM) 
0 = No masking of interrupt. When an interrupt condition is 

detected, hardware issues an interrupt message (using the 

Fault Event Data and Fault Event Address register values).

1 = This is the value on reset. Software may mask interrupt 

message generation by setting this field. Hardware is 

prohibited from sending the interrupt message when this 

field is set.

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Interrupt Pending (IP) 
Hardware sets the IP field whenever it detects an interrupt 

condition, which is defined as:
When primary fault logging is active, an interrupt condition 

occurs when hardware records a fault through one of the Fault 

Recording registers and sets the PPF field in Fault Status register.
When advanced fault logging is active, an interrupt condition 

occurs when hardware records a fault in the first fault record (at 

index 0) of the current fault log and sets the APF field in the Fault 

Status register.
Hardware detected error associated with the Invalidation Queue, 

setting the IQE field in the Fault Status register.
Hardware detected invalid Device-IOTLB invalidation completion, 

setting the ICE field in the Fault Status register.
Hardware detected Device-IOTLB invalidation completion time-

out, setting the ITE field in the Fault Status register.
If any of the status fields in the Fault Status register was already 

set at the time of setting any of these fields, it is not treated as a 

new interrupt condition.
The IP field is kept set by hardware while the interrupt message 

is held pending. The interrupt message could be held pending 

due to interrupt mask (IM field) being set or other transient 

hardware conditions.
The IP field is cleared by hardware as soon as the interrupt 

message pending condition is serviced. This could be due to 

either:
Hardware issuing the interrupt message due to either change in 

the transient hardware condition that caused interrupt message 

to be held pending, or due to software clearing the IM field.
Software servicing all the pending interrupt status fields in the 

Fault Status register as follows:

• When primary fault logging is active, software clearing the 

Fault (F) field in all the Fault Recording registers with faults, 

causing the PPF field in Fault Status register to be evaluated 

as clear.

• Software clearing other status fields in the Fault Status 

register by writing back the value read from the respective 

fields.

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