PPC7A Product Manual
1
st
Edition
Functional Description
8-36
External Interrupt (INT~)
The processor external interrupt pin (INT~) is asserted for a pending interrupt from the interrupt
controller in the South Bridge.
Interrupt priorities and modes are assigned as the firmware running on the PPC7A.
PCI Interrupts
There are 4 interrupt lines for the PMC expansion slots on the motherboard and the PMC carrier. These
are connected to the PIRQ~ inputs of the interrupt controller. The PIRQ~ inputs may be routed to any
IRQ that is set to level sensitive mode.
The interrupt routing follows the recommendations in the PCI specification and the PCI system design
guide with a “rotation” between each slot.
The interrupt lines for the two on-board PMC slots are routed as shown below:
Two single function PMCs (which always use INTA~) are able to use unique IRQs with appropriate
programming of the interrupt controller.
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