Detailed descriptions
16.3 System resources
SIMATIC IPC427C
136 Operating Instructions, 04/2009, A5E02414743-01
16.3.2 System resources used by the BIOS/DOS
The following tables and pictures describe the system resources for the factory state of the
device.
16.3.2.1 PCI Interrupt Lines
The interrupts are assigned to devices by BIOS. Exclusive non-shared interrupts are
available for the first two PCI-104 or PC/104-
Plus
slots as well as for DP12 and the first
Ethernet interface.
This means that applications or realtime operating system extensions can operate these
devices exclusively and with high-performance without having to share the interrupt with
other devices.
Table 16- 1 Interrupt sharing in APIC mode
Interrupt Interrupt type
IRQ0 System Timer / HPET ISA exclusive
IRQ1 PS/2 keyboard controller emulation ISA exclusive
IRQ2 Interrupt controller 2 ISA exclusive
IRQ3 Reserved for Com Port 2 (COM2) ISA exclusive (COM2)
IRQ4 Com Port 1 (COM1) ISA exclusive
IRQ5 Free
IRQ6 Reserved
IRQ7 Free
IRQ8 Realtime clock / HPET ISA exclusive
IRQ9 ACPI-SCI (system control interrupt)
IRQ10 CAN (optional) or free ISA exclusive (CAN)
IRQ11 Free
IRQ12 PS/2 mouse controller emulation ISA exclusive
IRQ13 Coprocessor ISA exclusive
IRQ14 Primary IDE Channel (enhanced mode) ISA exclusive
IRQ15 Secondary IDE Channel (enhanced mode) ISA exclusive
IRQ16 Graphics, PCI-Express Bridge, LAN2, SATA
Controller 2 (enhanced / native IDE mode)
PCI shared
IRQ17 LAN1 exclusive PCI exclusive
IRQ18 SATA-AHCI Controller (AHCI mode), SATA
Controller 1 (native IDE mode)
PCI shared
IRQ19 DP12/MPI or PROFINET (optional) PCI exclusive
IRQ20 PCI104 Slot 1 PCI exclusive
IRQ21 PCI104 Slot 2 PCI exclusive
IRQ22 PCI104 Slot 3, USB-UHCI Controller 1-3 (USB1.1),
USB-EHCI Controller 1 (USB2.0)
PCI shared
IRQ23 PCI104 Slot 3, USB-UHCI Controller 4-6 (USB1.1),
USB-EHCI Controller 2 (USB2.0)
PCI shared
