Intel E7-8891 v2 CM8063601377422 사용자 설명서

306

Intel

®

 Xeon

® 

Processor E7-2800/4800/8800 v2 Product Family

Datasheet Volume Two: Functional Description, February 2014

DMI VCM Resource Control

Controls the resources associated with PCI Express Virtual Channel 0.

DMI VCM Resource Status

Reports the Virtual Channel specific status. 

31:31

RW_LB

0x0

vcme:

Virtual Channel M Enable  
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 reenabling the Virtual Channel. 

30:27

RV

-

Reserved  

26:24

RW_LB

0x4

vcmid:

VCm ID  

23:8

RV

-

Reserved  

7:7

RO

0x1

tc7vcpm:

Traffic Class 7/ Virtual Channel 0 Map  
Traffic Class 7 is always routed to VCm. 

6:1

RO

0x0

tcvcmm:

Traffic Class / Virtual Channel M Map  
No other traffic class is mapped to VCM 

0:0

RO

0x0

tc0vcmm:

Traffic Class 0 Virtual Channel Map  

15:2

RV

-

Reserved