Datasheet

XIO2001
SCPS212G –MAY 2009–REVISED DECEMBER 2012 www.ti.com
3.7 PCI Interrupt Conversion to PCI Express Messages
The bridge converts interrupts from the PCI bus sideband interrupt signals to PCI Express interrupt
messages.
Table 3-7, Figure 3-7, and Figure 3-8 illustrate the format for both the assert and deassert INTx
messages.
Table 3-7. Interrupt Mapping
In The Code Field
INTERRUPT CODE FIELD
INTA 00
INTB 01
INTC 10
INTD 11
Figure 3-7. PCI Express ASSERT_INTX Message
Figure 3-8. PCI Express DEASSERT_INTX Message
3.8 PME Conversion to PCI Express Messages
When the PCI bus PME input transitions low, the bridge generates and sends a PCI Express PME
message upstream. The requester ID portion of the PME message uses the stored value in the secondary
bus number register as the bus number, 0 as the device number, and 0 as the function number. The Tag
field for each PME message is 00h. A PME message is sent periodically until the PME signal transitions
high.
Figure 3-9 illustrates the format for a PCI Express PME message.
32 Feature/Protocol Descriptions Copyright © 2009–2012, Texas Instruments Incorporated
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