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2 System Board
Assigned Device Interrupts
Assigned Device Interrupts
Input/Output Controller Hub Interrupts
PCI 64-bit Hub Interrupts
Interrupt Controllers
The system has an Interrupt controller which is equivalent in function to
that of two 82C59 interrupt controllers. The following table shows how the
interrupts are connected to the APIC controller. The Interrupt Requests
(IRQ) are numbered sequentially, starting with the master controller, and
followed by the slave (both of 82C59 type).
Device
Reference
Name
REQ/
GNT
ID
IDSEL
AD[xx]
Chip-set Interrupt Connection
INTA INTB INTC INTD
AC’97 Audio Controller
CS4280 4 (ICH) 5 21 — A — —
USB Controller
— — — — A — — —
AGP slot
J34 — 0 16 A B — —
PCI 32-bit slot #1
J37 1 (ICH) 6 22 C D A B
PCI 32-bit slot #2
J38 0 (ICH) 8 24 A B C D
PCI 32-bit slot #5 (LAN card)
J42 5 (ICH) 11 27 B C D A
Device
Reference
Name
REQ/
GNT
ID
IDSEL
AD[xx]
Interrupt Requests (IRQ)
0 1 2 3 4 5 6 7 8
Ultra-wide SCSI U160 Controller
AIC-7892 2 (P64H) 9 25 — — — — — — — — A
PCI 64-bit slot #3
J39 1 (P64H) 4 20 — — — — A B C D —
PCI 64-bit slot #4
J40 0 (P64H) 7 23 A B C D — — — — —