Intel Xeon X3460 BX80605X3460 User Manual

Intel® Xeon® Processor 3400 Series Datasheet, Volume 2

289

 provides a list of all the target decoder entries in IIO, such as PCIe port, 

required by the outbound target decoder to positively decode towards a target

.

1.

This is listed as 4+1 entries because each of the 4 local peer-to-peer bridges have their own VGA decode 

enable bit and local IIO has to comprehend this bit individually for each port, and local IIO’s 

QPIPVGASAD.Valid bit is used to indicate the dual IIO has VGA port or not.

Throughout the tables in this section, a reference to a PCIe port generically refers to a 
standard PCIe port or a DMI port.

Integrated I/O Module will support configurations cycles that originate only from the 

processor. It may support inbound CFG for debug only.

VGA (Memory space A_0000h–

B_FFFFh and I/O space 3B0h–

3BBh and 3C0h–3DFh)

4+1

1

Fixed. 

TPM/TXT/FW ranges (E/F segs 

and 4 G–16 M to 4 G)

1

Fixed. 

MMIOL

4

Variable. From peer-to-peer Bridge Configuration 

Register Space

MMIOH

4

Variable. From peer-to-peer Bridge Configuration 

Register Space (upper 32 bits PM BASE/LIMIT)

CFGBUS

1

Legacy IIO internal bus number should be set to bus 0.

4

Variable. From peer-to-peer Bridge Configuration 

Register Space for PCIe bus number decode.

VTBAR

1

Variable. Decodes the Intel VT-d chipset registers.

IO

4

Variable. From four local peer-to-peer Bridge 

Configuration Register Space of the PCIe port.

CB DMA BAR, 

I/OxAPIC BAR, 

ABAR, VTBAR

CB_BAR, ABAR, MBAR, VTBAR and remote 

peer-to-peer access

Completer Abort

CB_BAR, ABAR, MBAR, VTBAR and not 

remote peer-to-peer access

Forward to that target

TPM, FED4_0xxx - 

FED4_7xxx

Processor has no Intel TPM.

Forward to DMI as TXT_* cycle assuming 

Intel TPM is not supported.

All other memory 

accesses

! (CB_BAR, ABAR, MBAR, VTBAR, TPM) 

and one of the downstream ports 

positively claimed the address

Forward to that port

! (CB_BAR, ABAR, MBAR, VTBAR, TPM) 

and none of the downstream ports 

positively claimed the address and DMI is 

the subtractive decode port

Forward to DMI

! (CB_BAR, ABAR, MBAR, VTBAR, TPM) 

and none of the downstream ports 

positively claimed the address and DMI is 

not the subtractive decode port

Master Abort