Intel E7-8891 v2 CM8063601377422 User Manual

Intel

®

 Xeon

® 

Processor E7-2800/4800/8800 v2 Product Family

217

Datasheet Volume Two: Functional Description, February 2014

15:14

RV

-

Reserved. 

13:9

RO

0x0

interrupt_message_number:

Applies to root ports. This field indicates the interrupt message number that 

is generated for PM/Hot Plug/BW-change events. When there are more than 

one MSI interrupt Number allocated for the root port MSI interrupts, this 

register field is required to contain the offset between the base Message 

Data and the MSI Message that is generated when there are PM/Hot 

Plug/BW-change interrupts. IIO assigns the first vector for PM/Hot Plug/BW-

change events and so this field is set to 0.

8:8

RW_O

0x0

slot_implemented:

Applies only to the root ports.
1: indicates that the PCI Express link associated with the port is connected 

to a slot.
0: indicates no slot is connected to this port.

Notes:
This register bit is of type “write once” and is set by BIOS.

7:4

RO_V

0x4

device_port_type:

This field identifies the type of device. It is set to 0x4 for all the Express 

ports.

3:0

RW_O

0x2

capability_version:

This field identifies the version of the PCI Express capability structure, which 

is 2h as of now. This register field is left as RW_O to cover any unknowns 

with Gen3.