HP A2Y15AV User Manual

210

Datasheet, Volume 2

This register provides the first part of a Link Entry that declares an internal link to 
another Root Complex Element.

This register provides the second part of a Link Entry that declares an internal link to 
another Root Complex Element.

31:24

RO

00h

Uncore

Target Port Number (TPN)
Specifies the port number associated with the element targeted 

by this link entry (Egress Port). The target port number is with 

respect to the component that contains this element as specified 

by the target component ID.
00h is the egress port (memory). 

23:16

RW-O

00h

Uncore

Target Component ID (TCID)
Identifies the physical or logical component that is targeted by 

this link entry.
BIOS Requirement: This field must be initialized according to 

guidelines in the PCI Express* Isochronous/Virtual Channel 

Support Hardware Programming Specification (HPS).

15:2

RO

0h

1

RO

0b

Uncore

Link Type (LTYP)
Indicates that the link points to memory-mapped space (for 

RCRB). The link address specifies the 64-bit base address of the 

target RCRB.

0

RW-O

0b

Uncore

Link Valid (LV)
0 = Link Entry is not valid and will be ignored.
1 = Link Entry specifies a valid link.
BIOS should write "1' to this bit once it has programmed Link 

Entry 1 Address (LE1A) and while it writes the TCID in this 

register

31:12

RW-O

00000h

Uncore

Link Address (LA)
Memory mapped base address of the RCRB that is the target 

element (Egress Port) for this link entry.
BIOS Requirement: This field is inserted by BIOS such that it 

matches PXPEPBAR.

11:0

RO

0h