Intel B940 Datasheet Page 165

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Datasheet, Volume 2 165
Processor Configuration Registers
2.12.7 DMIVC0RSTS—DMI VC0 Resource Status Register
This register reports the Virtual Channel specific status.
2.12.8 DMIVC1RCAP—DMI VC1 Resource Capability Register
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 1A–1Bh
Reset Value: 0002h
Access: RO
Bit Attr
Reset
Value
Description
15:2 RO 0000h
Reserved: Reserved and Zero for future R/WC/S implementations. Software
must use 0 for writes to these bits.
1RO 1b
Virtual Channel 0 Negotiation Pending (VC0NP)
0 = The VC negotiation is complete.
1 = The VC resource is still in the process of negotiation (initialization or
disabling).
This bit indicates the status of the process of Flow Control initialization. It is
set by default on Reset, as well as whenever the corresponding Virtual
Channel is Disabled or the Link is in the DL_Down state.
It is cleared when the link successfully exits the FC_INIT2 state.
BIOS Requirement: Before using a Virtual Channel, software must check
whether the VC Negotiation Pending fields for that Virtual Channel are
cleared in both Components on a Link.
0RO 0bReserved
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 1C–1Fh
Reset Value: 00008001h
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 1b
Reject Snoop Transactions (REJSNPT)
0 = Transactions with or without the No Snoop bit set within the TLP header
are allowed on this VC.
1 = When Set, 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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