Figure 35, Figure 36, Figure 37 – Intel CONTROLLERS 413808 User Manual
Page 291
Intel
®
413808 and 413812 I/O Controllers in TPER Mode
October 2007
Developer’s Manual
Order Number: 317805-001US
291
Address Translation Unit (PCI Express)—Intel
®
413808 and 413812
The first byte at the Extended Configuration Offset D0H is the
Capability Identifier Register - Cap_ID” on page 429
. This identifies this Extended
Configuration Header space as the type defined by the PCI Local Bus Specification,
Revision 2.3.
Following the Capability Identifier Register is the single byte Next Item Pointer Register
which indicates the configuration offset of an additional Extended Capabilities Header,
when supported. In the ATU, the Next Item Pointer Register is set to D0H indicating
that there is an additional Extended Capabilities Headers supported in the ATUs
configuration space.
The first byte at the Extended Configuration Offset D0H is the PCI Express Capability
Identifier Register (
). This identifies this Extended Configuration Header
space as the type defined by the PCI Express Base Specification, Revision 1.0a.
Following the Capability Identifier Register is the single byte Next Item Pointer Register
) which indicates the configuration offset of an additional Extended
Capabilities Header, when supported. In the ATU, the Next Item Pointer Register is set
to 00H by default to indicate there are no additional Extended Capabilities Headers in
the ATUs configuration space. Software can set this pointer to 90H indicating that there
is an additional Extended Capabilities Headers supported in the ATUs configuration
space.
Figure 35. ATU Interface Extended Configuration Header Format (MSI Capability)
A0H
A4H
MSI Capability ID
MSI Next Item Pointer
MSI Message Control
MSI Message Address
MSI Message Upper Address
A8H
ACH
MSI Message Data
Reserved
Figure 36. ATU Interface Extended Configuration Header Format (PCI Express
Capability)
D8H
D0H
D4H
PCI Express Cap ID
Next Item Pointer
PCI Express Capabilities Register
PCI Express Device Capabilities
DCH
PCI Express Device Control
PCI Express Link Capabilities
E4H
E8H
PCI Express Slot Capabilities
PCI Express Slot Control
PCI Express Device Status
E0H
PCI Express Link Control
PCI Express Link Status
PCI Express Slot Status
PCI Express Root Status
ECH
PCI Express Root Control
Reserved
Figure 37. ATU Interface Extended Configuration Header Format (VPD Capability)
90H
94H
VPD Capability ID
Next Item Pointer
VPD Address
VPD Data