Intel CONTROLLERS 413808 - Manual (Page 250)

Intel
®
413808 and 413812—Address Translation Unit (PCI Express)
Intel ® 413808 and 413812 I/O Controllers in TPER Mode
Developer’s Manual October 2007
250 Order Number: 317805-001US
3.3.2.3 Outbound DMA Transactions
The ATU provides all ADMA channels with a transparent path through the PCI Express
interface. The entire 64-bit Host I/O Interface address programmed in the DMA
descriptor is passed to the PCI Express link unmodified.
3.3.2.4 Outbound Function Number
The 4138xx is a multi-function device and the ATU associates each transaction with the
correct PCI Express function number according to the following algorithm:
• Outbound Configuration transactions use the function number field specified in the
“Outbound Configuration Cycle Function Number - OCCFN” on page 383 .
• Outbound I/O transactions use the function number field specified in the “Outbound
I/O Base Address Register - OIOBAR” on page 371 .
• Outbound transactions targeting the outbound memory windows utilize the
“Outbound Window x Function Number Mapping” programmed into bits 30:28 of
the associated OUMBARx registers
• Outbound ADMA transactions use the “Host I/O Interface Function Number”
programmed in the ADMA byte count register.