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XIO2001IPNP Datenblatt(PDF) 33 Page - Texas Instruments

Teilenummer XIO2001IPNP
Bauteilbeschribung  XIO2001 PCI Express to PCI Bus Translation Bridge
PDF  145 Pages
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XIO2001IPNP Datenblatt(HTML) 33 Page - Texas Instruments

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8.3.5 PCI Interrupt Conversion to PCI Express Messages
The bridge converts interrupts from the PCI bus sideband interrupt signals to PCI Express interrupt messages.
Table 8-7, Figure 8-3, and Figure 8-4 illustrate the format for both the assert and deassert INTx messages.
Table 8-7. Interrupt
Mapping In The Code
Field
INTERRUPT
CODE FIELD
INTA
00
INTB
01
INTC
10
INTD
11
Figure 8-3. PCI Express ASSERT_INTX Message
Figure 8-4. PCI Express DEASSERT_INTX Message
8.3.6 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 8-5 illustrates the format for a PCI Express PME message.
Figure 8-5. PCI Express PME Message
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XIO2001
SCPS212J – MAY 2009 – REVISED JANUARY 2021
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