Technical data

Server Software and Utilities
2-9
DIGITAL Server 3220/3220R
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. The interrupt assignments for the PCI slots are shown in the table below.
PCI Device Interrupt and Slot INT Routing
Slot Number INTA, INTB, INTC, INTD
Proprietary Slot PIRQB(E-NET)
PIRQA(SVGA)
Slot 1 PIRQA
Slot 2 PIRQA
Slot 3 PIRQB
Slot 4 PIRQB
Slot 5 PIRQC
Slot 6 PIRQC
On-Board SCSI PIRQC (Channels A and B)
In BIOS Setup [F2], PCI IRQ lines 1 to 4 can be mapped to any one of the IRQs (3,
4, 5, 7, 9, 10, 11, 12, 14, 15) that are displayed in the Setup menu. However, there
are certain rules that must be followed to avoid IRQ conflicts.
1.
Use “Auto Select” (the default) for most Window NT installations, unless an ISA
legacy card is installed. Do not choose “Auto Select” if an ISA legacy card is
installed in the server.