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PCU – iLB – 8259 Programmable Interrupt Controllers (PIC)
Intel
®
Atom™ Processor E3800 Product Family
5290
Datasheet
42
PCU – iLB – 8259
Programmable Interrupt
Controllers (PIC)
The SoC provides an ISA-compatible programmable interrupt controller (PIC) that
incorporates the functionality of two, cascaded 8259 interrupt controllers.
incorporates the functionality of two, cascaded 8259 interrupt controllers.
42.1
Features
In addition to providing support for ISA compatible interrupts, this interrupt controller
can also support PCI based interrupts (PIRQs) by mapping the PCI interrupt onto a
compatible ISA interrupt line. Each 8259 controller supports eight interrupts, numbered
0–7.
can also support PCI based interrupts (PIRQs) by mapping the PCI interrupt onto a
compatible ISA interrupt line. Each 8259 controller supports eight interrupts, numbered
0–7.
Note:
The SoC does not implement any external PIRQ# signals. The PIRQs referred to in this
chapter originate from the interrupt routing unit.
chapter originate from the interrupt routing unit.
I
O
I
O
I
O
I
O
I
O
I
O
I
O
O
Platform Control Unit
UAR
T
LPC
GP
IO
IO
RT
C
C
HPET
82
59
59
AP
IC
IC
82
54
54
SMB
iLB
SP
I
I
PMC