AC82G41SLGQ3 Datasheet, PDF (225/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

Direct Memory Interface Registers (DMIBAR)
Bit
Access
31
R/W
30:27
26:24
23:20
RO
R/W
RO
19:17
R/W
16:8
RO
7:1
R/W
0
RO
Default
Value
0b
0h
001b
0h
000b
000h
00h
0b
RST/PWR
Description
Core
Core
Core
Core
Core
Core
Core
Core
Virtual Channel 1 Enable (VC1E):
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.
Reserved
Virtual Channel 1 ID (VC1ID): Assigns a VC ID to the
VC resource. Assigned value must be non-zero. This field
can not be modified when the VC is already enabled.
Reserved
Port Arbitration Select (PAS): This field configures the
VC resource to provide a particular Port Arbitration
service. 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.
Reserved
Traffic Class / Virtual Channel 1 Map (TCVC1M): 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.
Traffic Class 0 / Virtual Channel 1 Map (TC0VC1M):
Traffic Class 0 is always routed to VC0.
Datasheet
225