Detailed descriptions
16.4 System resources
SIMATIC IPC647C
176 Operating Instructions, 12/2010, A5E02669337-02
16.4.2.2 Interrupt assignments
The functions are assigned different interrupts, depending on the operating system. A
distinction is made between the PIC and APIC modes.
IRQ number
Comment
The functions are assigned different interrupts, depending on the operating system. A distinction is made between the PIC and APIC modes.
X = Interrupt in PIC and APIC mode, Y = Interrupt in APIC mode, Z = BIOS default interrupt in PIC mode (e.g. DOS)
Fixed
Fixed
Fixed
Can be switched off
Cannot be switched off
Can be switched off
Free
Can be switched off
Cannot be switched off
Can be switched off
Can be switched off
Can be switched off
Cannot be switched off
Can be switched off
Can be switched off
Can be switched off
Fixed
Fixed
Fixed
Fixed, can be switched off
Can be switched off
Function
Timer 0
PS/2 keyboard
Serial port 2
FD controller
PS/2 mouse
Numeric co-processor
HD controller 1 (prim.)
SATA
VGA
Profibus or Profinet
Thermal controller
Audio
USB ports 0 to 7
Ethernet 1 (phy.)
Cascaded (IRQ9)
Serial port 1
Parallel interface 1
Real-time clock (RTC)
HD controller 2 (sec.)
USB ports 8 to 13
Ethernet 2 (controller)
IRQ (ACPI mode)
IRQ (PIC mode)
Host PCI IRQ line
1) Host PCI-IRQ A to H is permanently assigned to IRQ 16 to 23 in APIC mode.
Host PCI-IRQ A to H is automatically assigned to IRQ 0 to 15 in PIC mode by the BIOS.
1)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A B C D E F G H
X
Z
Z
Y
Y
Y
Y
Y
Z
Z
X
X
X
X
X
X
X
X
X
X
X
Y
Z
Z
Z
Z
Y
Y
Y
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