HP A2Y15AV Manuale Utente

208

Datasheet, Volume 2

This register reports the Virtual Channel specific status.

This capability declares links from this element (PEG) to other elements of the root 
complex component to which it belongs. See PCI Express* specification for 
link/topology declaration requirements.

15:2

RO

0h

1

RO-V

1b

Uncore

VC0 Negotiation Pending (VC0NP)
0 = The VC negotiation is complete.
1 = The VC resource is still in the process of negotiation 

(initialization or disabling).

This bit indicates the status of the process of Flow Control 

initialization. It is set by default on Reset, as well as whenever 

the corresponding Virtual Channel is Disabled or the Link is in the 

DL_Down state. It is cleared when the link successfully exits the 

FC_INIT2 state.
Before using a Virtual Channel, software must check whether the 

VC Negotiation Pending fields for that Virtual Channel are cleared 

in both Components on a Link.

0

RO

0h

31:20

RO

0h

19:16

RO

1h

Uncore

Link Declaration Capability Version (LDCV)
Hardwired to 1 to indicate compliances with the 1.1 version of 

the PCI Express specification.
Note: This version does not change for 2.0 compliance.

15:0

RO

0005h

Uncore

Extended Capability ID (ECID)
Value of 0005 h identifies this linked list item (capability 

structure) as being for PCI Express Link Declaration Capability.
See corresponding Egress Port Link Declaration Capability 

registers for diagram of Link Declaration Topology.