15

1b

RO

PRG Response PASID Required (PRPR)

If set, the Function expects a PASID TLP Prefix on PRG Response Messages when the corresponding page requests had a PASID TLP Prefix.
If Clear, the function does not expect PASID TLP Prefixes on any PRG Response Message.
Function behavior is undefined if this bit is Clear and the Function receives a PRG Response Message with a PASID TLP Prefix.
Function behavior is undefined if this bit is Set and the Function receives a PRG Response Message with no PASID TLP Prefix when the corresponding Page Requests had a PASID TLP Prefix.
This bit is RsvdZ if the Function does not support the PASID TLP Prefix.

14:9

0h

RO

Reserved

8

1b

RO

Stopped (S)

When this field is Set, the associated page request interface has stopped issuing additional Page requests and that all previously issued Page requests have completed. When this field is clear the associate Page request interface either has not stopped or has stopped issuing new Page requests but has outstanding Page requests.

7:2

0h

RO

Reserved

1

0b

RW/V

Unexpected Page Request Group Index (UPGRI)

When Set, indicates the function received a PRG response message containing a PRG index that has no matching request, a response failure. This field is Set by the Function and cleared when a 1b is written to the field.

0

0b

RW/V

Response Failure (RF)

When Set, indicates the function received a PRG response message indicating a response failure. The function expects no further response from the host (any received are ignored). This field is Set by the Function and cleared when a 1b is written to this field.