Intel B940 Datasheet Page 158

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Processor Configuration Registers
158 Datasheet, Volume 2
2.11.4 VC0RCAP—VC0 Resource Capability Register
2.11.5 VC0RCTL—VC0 Resource Control Register
This register controls the resources associated with PCI Express Virtual Channel 0.
B/D/F/Type: 0/1/0/MMR
Address Offset: 110–113h
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 (RSNPT)
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
B/D/F/Type: 0/1/0/MMR
Address Offset: 114–117h
Reset Value: 8000_00FFh
Access: RO, RW
Bit Attr
Reset
Value
Description
31 RO 1b
VC0 Enable (VC0E)
For VC0, this is hardwired to 1 and read only as VC0 can never be disabled.
30:27 RO 0h Reserved
26:24 RO 000b
VC0 ID (VC0ID)
This field assigns a VC ID to the VC resource. For VC0 this is hardwired to 0
and read only.
23:20 RO 0h Reserved
19:17 RW 000b
Port Arbitration Select (PAS)
This field configures the VC resource to provide a particular Port Arbitration
service. This field is valid for RCRBs, Root Ports that support peer to peer
traffic, and Switch Ports, but not for PCI Express Endpoint devices or Root
Ports that do not support peer to peer traffic.
The permissible value of this field is a number corresponding to one of the
asserted bits in the Port Arbitration Capability field of the VC resource.
16 RO 0b Reserved: Reserved for Load Port Arbitration Table
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