Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Integrated I/O (IIO) Configuration Registers
306
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
14.3.11 DMIVCMRCTL
DMI VCM Resource Control
Controls the resources associated with PCI Express Virtual Channel 0.
14.3.12 DMIVCMRSTS
DMI VCM Resource Status
Reports the Virtual Channel specific status. 
Type:
MEM
PortID:
8’h7e
Bus:
0
Device:
0Function:0
Offset:
0x38
Bit
Attr
Default
Description
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  
Type:
MEM
PortID:
8’h7e
Bus:
0
Device:
0Function:0
Offset:
0x3e
Bit
Attr
Default Description
15:2
RV
-
Reserved  
downloadlike
ArtboardArtboardArtboard
Report Bug