Specifications

PC BIOS
PP 41x/03x 10-7
Table 10-3 lists the typical interrupt structure in APIC mode. A total of 24 interrupts are available.
The 6300ESB ICH interrupt inputs PIRQA – PIRQH are mapped to IRQ16 – IRQ23 respectively.
Interrupt Device(s)
IRQ0 Legacy PIC Interrupt
IRQ1 Keyboard
IRQ2 Timer 0
IRQ3 Serial Port COM2
IRQ4 Serial Port COM1
IRQ5 Combined Interrupt (IPMI + PIT + CompactPCI
M66EN transition + CompactPCI ENUM#)
IRQ6 Floppy Disk Controller (AD PP5/001 Super I/O)
IRQ7 Parallel Port (AD PP5/001 Super I/O)
IRQ8 Real Time Clock
IRQ9
IRQ10
IRQ11 Serial Ports COM3 + COM4 (AD PP5/001 Super I/O)
IRQ12 Mouse
IRQ13 Floating Point Error
IRQ14 Primary IDE
IRQ15 Secondary IDE
IRQ16 USB 1 UHCI Controller #1
PIRQA
IRQ17 AC’97 Audio, Modem, option for SMBus
PIRQB
IRQ18 SATA
PIRQC
IRQ19 USB 1 UHCI Controller #2
PIRQD
IRQ20 PIRQE
IRQ21 PIRQF
IRQ22 PIRQG
IRQ23
USB 2.0 EHCI Controller
PIRQH
Table 10-3 Interrupt Structure in APIC Mode