Pci Hardware Interrupts - Siemens SIMATIC IPC647D Operating Instructions Manual

8.5.2.2

PCI hardware interrupts

Applications demanding high-performance interrupt handling require high-speed hardware
interrupt reaction. The PCI hardware interrupt should only be used by one resource in order
to ensure high-speed reaction of the hardware.
Setting up an exclusive interrupt on the device (only APIC mode)
An exclusive interrupt can only be used with bus board 2 × PCI with piggyback 2 x PCIe at
PCI slot 2 and PCI slot 3. Further exclusive interrupts for use at the slots are not available.
Assigning exclusive interrupts in BIOS Setup (PIC mode only)
The interrupts are automatically assigned to the slots at system startup due to the default
settings in system BIOS.
Several slots may share the same interrupt, depending on the system configuration. This
functionality is known as interrupt sharing. Exclusive interrupts are not available in PIC
mode. Disable specific system resources in order to obtain exclusive interrupts. The resulting
free interrupt is then assigned to the slots. The lower free IRQ is assigned to the lower Slot
No.
If a conflict arises through the assignment, a message will be displayed and has to be
acknowledged.
Message: "Resources Conflict. Please re-select [ok]"
The interface that causes the conflict is disabled automatically. Additional information is
available in the section Interrupt assignments (Page 162).
Example
If you want to use "IRQ 3" for a slot, you have to disable the "Internal COM 2" by using
Advanced > Peripheral Configuration. IRQ 3 is then assigned automatically to the slot that
has the lowest slot number.
Ethernet 1
Ethernet 2
PROFIBUS/MPI
PCI slot 1
PCI slot 2
PCI Express slot
1)
2)
3)
SIMATIC IPC647D
Operating Instructions, 01/2014, A5E32996306-AA
IRQ assignments for Windows (APIC mode)
Requirement: The modules in the PCI slots each require only one interrupt
Requirement: VGA and PCI Express do not require an interrupt
Requirement: VGA does not require an interrupt and Ethernet1 is disabled
Technical specifications
8.5 Hardware description
16
1, 2
17
1
19
1
20
1
21
1
16
1, 3
155