Introduction

1.8Interrupt Routing

Table 6 shows the ORing of interrupts. 12 interrupts are connected to each of three secondary bus PCI slots but four (4) interrupts are driven to the card edge. The 12 incoming interrupts must be combined. Interrupt ORing is in accordance with the PCI-to-PCI Bridge Architecture Specification revision 1.1.

Table 6. Interrupt ORing

Device Number

Interrupt Pin on

Interrupt Pin on Board

Device

Connector

 

 

 

 

 

INTA#

INTB#

5

INTB#

INTC#

(Optional slot J101)

INTC#

INTD#

 

INTD#

INTA#

 

 

 

 

INTA#

INTA#

6

INTB#

INTB#

(PICMG slot J101)

INTC#

INTC#

 

INTD#

INTD#

 

 

 

 

INTA#

INTD#

7

INTB#

INTA#

(Top slot J7)

INTC#

INTB#

 

INTD#

INTC#

 

 

 

21555 PCI-to-PCI Bridge Evaluation Board User’s Guide

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Intel 21555 manual Interrupt Routing, Interrupt ORing, Device Number Interrupt Pin on Interrupt Pin on Board

21555 specifications

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