Intel B940 Datasheet Page 157

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Datasheet, Volume 2 157
Processor Configuration Registers
2.11.2 PVCCAP2—Port VC Capability Register 2
This register describes the configuration of PCI Express Virtual Channels associated
with this port.
2.11.3 PVCCTL—Port VC Control Register
B/D/F/Type: 0/1/0/MMR
Address Offset: 108–10Bh
Reset Value: 0000_0000h
Access: RO
Bit Attr
Reset
Value
Description
31:24 RO 00h
VC Arbitration Table Offset (VCATO)
This field indicates the location of the VC Arbitration Table. This field contains
the zero-based offset of the table in DQWORDS (16 bytes) from the base
address of the Virtual Channel Capability Structure. A value of 0 indicates
that the table is not present (due to fixed VC priority).
23:8 RO 0000h Reserved
7:0 RO 00h Reserved for VC Arbitration Capability (VCAC)
B/D/F/Type: 0/1/0/MMR
Address Offset: 10C–10Dh
Reset Value: 0000h
Access: RO, RW
Bit Attr
Reset
Value
Description
15:4 RO 000h Reserved
3:1 RW 000b
VC Arbitration Select (VCAS)
This field will be programmed by software to the only possible value as
indicated in the VC Arbitration Capability field. Since there is no other VC
supported than the default, this field is reserved.
0RO 0b
Reserved for Load VC Arbitration Table
This bit is used for software to update the VC Arbitration Table when VC
arbitration uses the VC Arbitration Table. As a VC Arbitration Table is never
used by this component this field will never be used.
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