Intel E3815 FH8065301567411 데이터 시트
제품 코드
FH8065301567411
PCU – iLB – Interrupt Decoding and Routing
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
5283
40.1.2.1
Routing PCI Based Interrupts to 8259 PIC
The interrupt router can be programmed to allow PIRQA-PIRQH to be routed internally
to the 8259 as ISA compatible interrupts IRQ 3–7, 9–12 & 14–15. The assignment is
programmable through the 8 PIRQx Routing Control Registers: PIRQA, PIQRB, PIRQC,
PIRQD, PIRQE, PIRQF, PIRQG, PIRQH. One or more PIRQs can be routed to the same
IRQ input. If ISA Compatible Interrupts are not required, the Route registers can be
programmed to disable steering.
to the 8259 as ISA compatible interrupts IRQ 3–7, 9–12 & 14–15. The assignment is
programmable through the 8 PIRQx Routing Control Registers: PIRQA, PIQRB, PIRQC,
PIRQD, PIRQE, PIRQF, PIRQG, PIRQH. One or more PIRQs can be routed to the same
IRQ input. If ISA Compatible Interrupts are not required, the Route registers can be
programmed to disable steering.
The PIRQx# lines are defined as active low, level sensitive. When a PIRQx# is routed to
specified IRQ line, software must change the IRQ's corresponding ELCR bit to level
sensitive mode. The SoC internally inverts the PIRQx# line to send an active high level
to the PIC. When a PCI interrupt is routed onto the PIC, the selected IRQ can no longer
be used by an active high device (through SERIRQ). However, active low interrupts can
share their interrupt with PCI interrupts.
specified IRQ line, software must change the IRQ's corresponding ELCR bit to level
sensitive mode. The SoC internally inverts the PIRQx# line to send an active high level
to the PIC. When a PCI interrupt is routed onto the PIC, the selected IRQ can no longer
be used by an active high device (through SERIRQ). However, active low interrupts can
share their interrupt with PCI interrupts.
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