Intel CONTROLLERS 413808 - Manual (Page 127)

Intel ® 413808 and 413812 I/O Controllers in TPER Mode
October 2007 Developer’s Manual
Order Number: 317805-001US 127
Address Translation Unit (PCI-X)—Intel
®
413808 and 413812
2.10 Vital Product Data
Vital Product Data (VPD) provides detailed information to the system regarding the
hardware, software and microcode elements of a device. This information may include
Part Number, Serial Number or other detailed information. This information resides on a
non-volatile storage device (i.e., Flash Memory) attached to the 4138xx. In addition
VPD also provides a mechanism for storing information such as performance or failure
data on the device being monitored.
Support of VPD involves the implementation of the VPD Extended Capabilities List Item
in the Primary ATU. The VPD Extended capabilities header consists of five registers, the
“VPD Capability Identifier Register - VPD_Cap_ID” on page 185 , the “VPD Next Item
Pointer Register - VPD_Next_Item_Ptr” on page 185 , the “VPD Address Register -
VPDAR” on page 186 , and the “VPD Data Register - VPDDR” on page 186 .
Scheduled by Intel XScale
®
processor interrupts, the 4138xx may be used to retrieve
or store VPD information through the VPD extended capabilities list item.
Please consult Appendix I of the PCI Local Bus Specification, Revision 2.3 for the
definitions of compliant VPD format.
2.10.1 Configuring Vital Product Data Operation
By default, the 4138xx VPD functionality is not configured for operation. Specifically,
the VPD Extended Capabilities List Item is not discovered during a PCI bus scan and the
ATUs VPD interrupt status bit in the “ATU Interrupt Status Register - ATUISR” on
page 181 is masked by the “ATU Interrupt Mask Register - ATUIMR” on page 183 . The
following steps should be followed to properly configure the 4138xx support for VPD:
1. The 4138xx must be strapped to Retry Type 0 Configuration cycles following the
deassertion of P_RST# . Enabling this configuration cycle retry mechanism insures
that the Intel XScale
®
processor can make the VPD Extended Capabilities List Item
visible before the system configures the 4138xx. The configuration retry
mechanism is controlled through bit 2 of the “PCI Configuration and Status Register
- PCSR” on page 178 .
2. When the configuration retry mechanism is strapped enabled as described in step
1, typically, the 4138xx would also be strapped such that the Intel XScale
®
processor would immediately boot following the deassertion of P_RST# (bit 1 of
the PCSR), though this is not required.
3. The Intel XScale
®
processor writes E8H to the “PCI-X Next Item Pointer Register -
PCI-X_Next_Item_Ptr” on page 191 . This links the PCI-X Capabilities List Item to
the VPD Capabilities List Item.
4. The Intel XScale
®
processor clears bit 12 of the ATUIMR to enable the ATUs VPD
interrupt status bit.