Intel B940 Datasheet Page 163

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Datasheet, Volume 2 163
Processor Configuration Registers
2.12.4 DMIPVCCTL—DMI Port VC Control Register
2.12.5 DMIVC0RCAP—DMI VC0 Resource Capability Register
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: C–Dh
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.
The value 000b when written to this field will indicate the VC arbitration
scheme is hardware fixed (in the root complex). This field cannot be modified
when more than one VC in the LPVC group is enabled.
000 = Hardware fixed arbitration scheme. (such as, Round Robin)
Others = Reserved
See the PCI express specification for more details.
0RO 0bReserved for Load VC Arbitration Table
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 10–13h
Reset Value: 0000_0001h
Access: RO
Bit Attr
Reset
Value
Description
31:24 RO 00h Reserved for Port Arbitration Table Offset
23 RO 0b Reserved
22:16 RO 00h Reserved for Maximum Time Slots
15 RO 0b
Reject Snoop Transactions (REJSNPT)
0 = Transactions with or without the No Snoop bit set within the TLP header
are allowed on this VC.
1 = Any transaction for which the No Snoop attribute is applicable but is not
set within the TLP Header will be rejected as an Unsupported Request.
14:8 RO 00h Reserved
7:0 RO 01h
Port Arbitration Capability (PAC)
Having only bit 0 set indicates that the only supported arbitration scheme for
this VC is non-configurable hardware-fixed.
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