APPENDIX
64
MB990 User’s Manual
B. Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the service
required. The following table shows the IRQ used by the devices on
board.
Level
Function
IRQ0
System Timer
IRQ3
Serial Port #2
IRQ4
Serial Port #1
IRQ5
Serial Port #3
IRQ7
Serial Port #4
IRQ8
Real Time Clock
IRQ 10
Serial Port #5
IRQ 11
Serial Port #6
IRQ 11
Intel(R) 100 Series/C230 Series Chipset Family
Integrated Sensor Hub - A135
IRQ 11
Intel(R) 100 Series/C230 Series Chipset SMBus -
A123
IRQ 11
Intel(R) 100 Series/C230 Series Chipset Thermal
subsystem - A131
IRQ 13
Numeric data processor
IRQ 16
High Definition Audio Controller
IRQ 16
Standard SATA AHCI Controller
IRQ 17
Intel(R) 100 Series/C230 Series Chipset Family PCI
Express Root Port #6 - A115
IRQ 19
Intel(R) Active Management Technology - SOL
(COM7)
IRQ 19
PCI standard PCI-to-PCI bridge
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