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Datasheet, Volume 2

137

Processor Configuration Registers 

This register reports the Virtual Channel specific status.

This register reports PCI Express* configuration control of PCI Express Completion 
Timeout related parameters that are not required by the PCI Express specification.

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

31:15

RO

000000000

00000000b

14:12

RW

111b

PCI Express Completion Timeout (PEG_TC)
This field determines the number of milliseconds the Transaction 

Layer will wait to receive an expected completion. To avoid hang 

conditions, the Transaction Layer will generate a dummy 

completion to the requestor if it does not receive the completion 

within this time period.
000 = Disable
001 = Reserved
010 = Reserved
100 = Reserved
101 = Reserved
110 = Reserved
x11 = 48 ms – for normal operation

11:0

RO

000000000

000b