HP A2Y15AV Manual Do Utilizador

Datasheet, Volume 2

221

Processor Configuration Registers 

This register controls the resources associated with PCI Express* Virtual Channel 0.

31

RO

1b

Uncore

Virtual Channel 0 Enable (VC0E) 
For VC0, this is hardwired to 1 and read only as VC0 can never be 

disabled.

30:27

RO

0h

26:24

RO

000b

Uncore

Virtual Channel 0 ID (VC0ID) 
This field assigns a VC ID to the VC resource. For VC0, this is 

hardwired to 0 and read only.

23:20

RO

0h

19:17

RW

000b

Uncore

Port Arbitration Select (PAS) 
This field configures the VC resource to provide a particular Port 

Arbitration service. A valid value for this field is a number 

corresponding to one of the asserted bits in the Port Arbitration 

Capability field of the VC resource. Because only bit 0 of that field 

is asserted.
This field will always be programmed to '1'.

16:8

RO

0h

7

RO

0b

Uncore

6:1

RW

3Fh

Uncore

Traffic Class / Virtual Channel 0 Map (TCVC0M) 
This field indicates the TCs (Traffic Classes) that are mapped to 

the VC resource. Bit locations within this field correspond to TC 

values.
For example, when bit 7 is set in this field, TC7 is mapped to this 

VC resource. When more than one bit in this field is set, it 

indicates that multiple TCs are mapped to the VC resource. In 

order to remove one or more TCs from the TC/VC Map of an 

enabled VC, software must ensure that no new or outstanding 

transactions with the TC labels are targeted at the given Link.

0

RO

1b

Uncore

Traffic Class 0 / Virtual Channel 0 Map (TC0VC0M) 
Traffic Class 0 is always routed to VC0.