Intel E3815 FH8065301567411 Data Sheet

Intel

®

 Atom™ Processor E3800 Product Family

3182

Datasheet

A root port is capable of handling interrupts and events from an end point device. A 
root port can also generate its own interrupts for some events, including power 
management and hot plug events, but also including error events.

There are two interrupt types a root port will receive from an end point device: INTx 
(legacy), and MSI. MSI’s are automatically passed upstream by the root port, just as 
other memory writes would be. INTx messages are delivered to the Legacy block’s 
interrupt router/controller by the root port.

Events and interrupts that are handled by the root port are shown with the possible 
interrupts they can deliver to the interrupt decoder/router.

 lists the possible interrupts and events generated based on Packets received, 

or events generated in the root port. Configuration needed by software to enable the 
different interrupts as applicable.

When INTx interrupts are received by an end point, they are mapped to the following 
interrupts and sent to the interrupt decoder/router in the iLB:

Interrupts generated from events within the root port are not swizzled.

Express Card Hot Plug is available based on Presence Detection for each root port.

INTx

Packet

X

X

PM_PME

Packet

X

X

Power Management (PM)

Event

X

X

X

X

Hot Plug (HP)

Event

X

X

X

X

ERR_CORR

Packet

X

ERR_NONFATAL

Packet

X

ERR_FATAL

Packet

X

Internal Error

Event

X

VDM

Packet

X

Root Port 1

INTA#

INTB#

INTC#

INTD#

Root Port 2

INTD#

INTA#

INTB#

INTC#

Root Port 3

INTC#

INTD#

INTA#

INTB#

Root Port 4

INTB#

INTC#

INTD#

INTA#