Intel B940 Datasheet Page 162

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Processor Configuration Registers
162 Datasheet, Volume 2
2.12.2 DMIPVCCAP1—DMI Port VC Capability Register 1
Describes the configuration of PCI Express Virtual Channels associated with this port.
2.12.3 DMIPVCCAP2—DMI Port VC Capability Register 2
This register describes the configuration of PCI Express Virtual Channels associated
with this port.
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 4–7h
Reset Value: 0000_0000h
Access: RO, RW-O
Bit Attr
Reset
Value
Description
31:7 RO 0000000h Reserved
6:4 RO 000b
Low Priority Extended VC Count (LPEVCC)
This field indicates the number of (extended) Virtual Channels in addition to
the default VC belonging to the low-priority VC (LPVC) group that has the
lowest priority with respect to other VC resources in a strict-priority VC
Arbitration.
The value of 0 in this field implies strict VC arbitration.
3RO 0bReserved
2:0 RW-O 000b
Extended VC Count (EVCC)
This field indicates the number of (extended) Virtual Channels in addition to
the default VC supported by the device.
For DMI, only the default Virtual Channel (VC0) is advertised in the Extended
VC Capability structure.
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 8–Bh
Reset Value: 0000_0000h
Access: RO
Bit Attr
Reset
Value
Description
31:24 RO 00h Reserved for VC Arbitration Table Offset
23:8 RO 0000h Reserved
7:0 RO 00h Reserved for VC Arbitration Capability (VCAC)
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