Intel i7-3920XM Extreme AW8063801009607 User Manual

Datasheet, Volume 2

225

Processor Configuration Registers 

This register controls the resources associated with the DMI Private Channel (VCp).

31

RW

0b

Uncore

Virtual Channel private Enable (VCPE) 
0 = Virtual Channel is disabled.
1 = Virtual Channel is enabled. See exceptions below.
Software must use the VC Negotiation Pending bit to check 

whether the VC negotiation is complete. When VC Negotiation 

Pending bit is cleared, a 1 read from this VC Enable bit indicates 

that the VC is enabled (Flow Control Initialization is completed for 

the PCI Express port). A 0 read from this bit indicates that the 

Virtual Channel is currently disabled.
BIOS Requirement:

1.

To enable a Virtual Channel, the VC Enable bits for that 

Virtual Channel must be set in both Components on a Link.

2.

To disable a Virtual Channel, the VC Enable bits for that 

Virtual Channel must be cleared in both Components on a 

Link.

3.

Software must ensure that no traffic is using a Virtual 

Channel at the time it is disabled.

4.

Software must fully disable a Virtual Channel in both 

Components on a Link before re-enabling the Virtual 

Channel.

30:27

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0h

26:24

RW

010b

Uncore

Virtual Channel private ID (VCPID) 
This field assigns a VC ID to the VC resource. This field cannot be 

modified when the VC is already enabled.

23:8

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0h

7

RO

0b

Uncore

6:1

RW

00h

Uncore

Traffic Class / Virtual Channel private Map (TCVCPM) 
It is recommended that private TC6 (01000000b) is the only 

value that should be programmed into this field for VCp traffic 

which will be translated by a virtualization engine, and TC2 

(00000010b) is the only value that should be programmed into 

this field for VCp traffic which will not be translated by a 

virtualization engine. This strategy can simplify debug and limit 

validation permutations.
BIOS Requirement: Program this field with the value 100010b, 

which maps TC2 and TC6 to VCp.

0

RO

0b

Uncore