Intel B940 Datasheet Page 328

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Processor Configuration Registers
328 Datasheet, Volume 2
2.20 Device 6 Extended Configuration Registers
Note: Device 6 is not supported on all SKUs.
2.20.1 PVCCAP1—Port VC Capability Register 1
This register describes the configuration of PCI Express Virtual Channels associated
with this port.
Table 2-15. Device 6 Extended Configuration Register Address Map
Address
Offset
Register
Symbol
Register Name Reset Value Access
104–107h PVCCAP1 Port VC Capability Register 1 00000000h RO
108–10Bh PVCCAP2 Port VC Capability Register 2 00000000h RO
10C–10Dh PVCCTL Port VC Control 0000h RO, RW
110–113h VC0RCAP VC0 Resource Capability 00000001h RO
114–117h VC0RCTL VC0 Resource Control 800000FFh RO, RW
11A–11Bh VC0RSTS VC0 Resource Status 0002h RO
140–143h RCLDECH Root Complex Link Declaration Enhanced 00010005h RO
B/D/F/Type: 0/6/0/MMR
Address Offset: 104–107h
Reset Value: 0000_0000h
Access: RO
Bit Attr
Reset
Value
Description
31:12 RO 00000h Reserved
11:10 RO 00b Reserved: Reserved for Port Arbitration Table Entry Size
9:8 RO 00b Reserved: Reserved for Reference Clock
7RO 0bReserved
6:4 RO 000b
Low Priority Extended VC Count (LPEVCC)
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 RO 000b
Extended VC Count (EVCC)
Indicates the number of (extended) Virtual Channels in addition to the
default VC supported by the device.
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