PCI Express* Registers (D1:F0)
6.1.53
VC0RSTS—VC0 Resource Status
B/D/F/Type:
Address Offset:
Default Value:
Access:
0/1/0/MMR
11A–11Bh
0002h
RO
16 bits
Size:
This register reports the Virtual Channel specific status.
Bit
15:2
1
Access &
Default
Description
Reserved
RO
0000h
VC0 Negotiation Pending (VC0NP):
RO
1b
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
0b
Reserved
Datasheet
209
INTEL [ INTEL ]
