Detailed descriptions 
  16.3 System resources 
SIMATIC Box PC 627 
Operating Instructions, Release 05/2006, A5E00362052-03 
16-23 
16.3.2.2  Interrupt Assignments 
 
 
Interrupt  Description  Comment 
IRQ0  System timer  fixed 
IRQ1  Keyboard  fixed 
IRQ4  Serial port COM1 
2)
 
IRQ8  Real-time clock (RTC)  fixed 
IRQ9  Microsoft ACPI-Compliant System 
1) 
 
IRQ13  Numeric processor  fixed 
IRQ14  1. IDE channel (primary) 
2)
 
IRQ16  Mobile Intel 915GM/GMS, 910GML 
Express Chipset Family 
1)
 
IRQ16  Intel® 82801FB/FBM USB Universal 
Host Controller - 2658 
1)
 
IRQ 16  Intel® 82801FB/FBM USB Universal 
Host Controller -2659 
1)
 
IRQ 19  Intel® 82801FB Ultra ATA Storage 
Controllers - 2652 
1)
 
IRQ 20  VIA Rhine III Fast Ethernet Adapter 
2)
 
IRQ 22  Intel® 82801FB/FBM Universal Host 
Controller - 265A 
1)
 
IRQ 22  Intel® 82801FB/FBM Universal Host 
Controller -265B 
1)
 
IRQ 22  VIA Rhine III Fast Ethernet Adapter #2 
2)
 
IRQ 23  Intel® 82801FB/FBM USB2 Enhanced 
Host Controller - 265C 
1)
 
 
 
PCI Interrupt Lines  PCI devices interrupt assignment (PCI IRQ) 
INT – A  Graphics, USB A (channel 0+1), USB B (channel 2+ 3) 
INT – B  Slot 1 
INT – C  Slot 2 
INT – D  Serial ATA 
INT – E  Ethernet 1 
INT – F  MPI/DP 
INT – G  Ethernet 2, USB C (channel 4+5), USB D (channel 6 + 7) 
INT - H  USB 2.0 
 
1) 
The on-board PCI devices require PCI interrupt channels. These interrupt channels are 
sharable and plug and play compatible. This means several devices can share the same 
interrupt. Interrupts are assigned automatically (exception: see section, Exclusive PCI 
Hardware Interrupt).  
2) 
These functions can be disabled in the Setup This releases allocated resources.