Technical data

Server Software and Utilities
2-9
DIGITAL Server 5220
PCI IRQ Assignments
In the BIOS, the PCI slots are assigned PCI IRQ A, B, C, or D, using mnemonics
PIRQA, PIRQB, PIRQC, and PIRQD. PIRQD is reserved for the USB ports (USB
IRQ). The V-Net card is installed in the Proprietary slot and uses PIRQA for the
SVGA controller and PIRQB for the Ethernet controller. The on-board SCSI uses
PIRQC for both Channel A and Channel B. The interrupt assignments for the PCI
slots are shown in the following table.
NOTE:
PCI slots 7-10 have two different PIRQs assigned. If the
adapter installed uses only one IRQ, it will use the PIRQx in the first
column. If the adapter uses multiple IRQs (example: Adaptec 3940), it
will use the associated IRQs in both columns.
PCI Device Interrupt and Slot INT Routing
Slot Number INTA, INTB, INTC, INTD
Proprietary Slot PIRQB (E-NET) PIRQA (SVGA)
Slot 1 PIRQA PIRQA
Slot 2 PIRQA PIRQA
Slot 3 PIRQB PIRQB
Slot 4 PIRQB PIRQB
Slot 5 PIRQC PIRQC
Slot 6 PIRQC PIRQC
Slot 7 PIRQA PIRQC
Slot 8 PIRQB PIRQC
Slot 9 PIRQA PIRQB
Slot 10 PIRQA PIRQB
On-Board SCSI PIRQC (Ch.A) PIRQC (Ch.B)