Справочник Пользователя для HP A2Y15AV

Datasheet, Volume 2

135

Processor Configuration Registers 

31:24

RO

00h

Uncore

23

RO

0h

22:16

RO

00h

Uncore

15

RO

0b

Uncore

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

0h

7:0

RO

01h

Uncore

Port Arbitration Capability (PAC)
This field indicates types of Port Arbitration supported by the VC 

resource. This field is valid for all Switch Ports, Root Ports that 

support peer-to-peer traffic, and RCRBs, but not for PCI Express 

Endpoint devices or Root Ports that do not support peer-to-peer 

traffic. 
Each bit location within this field corresponds to a Port Arbitration 

Capability defined below. When more than one bit in this field is 

set, it indicates that the VC resource can be configured to provide 

different arbitration services. 
Software selects among these capabilities by writing to the Port 

Arbitration Select field (see below). 
Defined bit positions are:
Bit 0

Non-configurable hardware-fixed arbitration scheme, 

such as., Round Robin (RR)

Bit 1

Weighted Round Robin (WRR) arbitration with 32 

phases

Bit 2

WRR arbitration with 64 phases

Bit 3

WRR arbitration with 128 phases

Bit 4

Time-based WRR with 128 phases

Bit 5

WRR arbitration with 256 phases

Bits 6-7 Reserved 
Processor only supported arbitration indicates "Non-configurable 

hardware-fixed arbitration scheme".