B. interrupt request lines (irq) – IBASE SI-83 User Manual
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SI-83 User 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
IRQ4
Serial Port #1
IRQ8
System CMOS / real time clock
IRQ11
Intel(R) 8 Series/C220 Series SMBus Controller
-8C22
IRQ13
Numeric data processor
IRQ16
Intel(R) 8 Series/C220 Series USB EHCI#2 -8C2D
IRQ19
Intel(R) 8 Series 4 port Serial ATA Storage Controller
-8C01
IRQ22
High Definition Audio
Controller
IRQ23
Intel(R) 8 Series/C220 Series USB EHCI#1-8C26
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