Intel Xeon X3460 BX80605X3460 Benutzerhandbuch

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Intel® Xeon® Processor 3400 Series Datasheet, Volume 2

 details IIO behavior for configuration requests from Intel QuickPath 

Interconnect and peer-to-peer completions from Intel QuickPath Interconnect.

1.

Note that when forwarding to DMI, Type 0 transaction with any device number is required to be forwarded 

by IIO (unlike the standard PCI Express root ports)

2.

If a downstream port is a standard PCI Express root port, then PCI Express specification requires that all 

non-zero-device numbered Type0 transactions are master aborted by the root port. If the downstream port 

is non-legacy DMI, then Type 0 transaction with any device number is allowed/forwarded.

3.

Note that when forwarding to DMI, Type 0 transaction with any device number is required to be forwarded 

by IIO (unlike the standard PCI Express root ports).

 details IIO behavior when no target has been positively decoded for an 

outgoing I/O transaction from Intel QuickPath Interconnect Inbound Address Decoding.

Bus 0

Bus 0 and legacy IIO and device number 

matches one of internal device numbers

Forward to that internal device.

Bus 0 and legacy IIO and device number does 

NOT match one of IIO’s internal device 

numbers

Forward to the downstream subtractive 

decode port, that is, the legacy DMI port
If the transaction is a configuration request, 

the request is forwarded as a Type 0

1

 

configuration transaction to the subtractive 

decode port

Bus 0 and NOT legacy IIO

Master Abort

Bus 1–255

Bus 1–255 and it matches the IIOBUSNO and 

device number matches one of IIO’s internal 

device numbers

Forward to that internal device. 

Bus 1–255 and it matches the IIOBUSNO and 

device number does NOT match any of IIO’s 

internal device numbers

Master Abort

Bus 1–255 and it does not match the 

IIOBUSNO but positively decodes to one of 

the downstream PCIe ports

Forward to that port. 
Configuration requests are forwarded as a 

Type 0

2

 (if bus number matches secondary 

bus number of port) or a Type 1.

Bus 1–255 and it does not match the 

IIOBUSNO and does not positively decode to 

one of the downstream PCIe ports and DMI is 

the subtractive decode port

Forward to DMI

3

.

Forward configuration request as Type 0/1, 

depending on secondary bus number register 

of the port.

Bus 1–255 and it does not match the 

IIOBUSNO and does not positively decode to 

one of the downstream PCIe ports and DMI is 

not the subtractive decode port

Master Abort

Any I/O 

address not 

positively 

decoded

No valid target decoded and one of the 

downstream ports is the subtractive decode port

Forward to downstream subtractive 

decode port

No valid target decoded and none of the 

downstream ports is the subtractive decode port

Master Abort