Exclusive Pci Hardware Interrupt - Siemens SIMATIC IPC847D Operating Instructions Manual

Technical specifications
8.5 Hardware description
Note
As long as no modules are plugged into slots 1, 2, 3, IRQs 17, 18, 19 are not used by the
PCIe switch, the display only shows that these IRQs would be used if modules were plugged
in.
The PCIe switch is displayed in Windows Device Management as "PCI standard PCI-to-PCI
bridge".
8.5.2.4

Exclusive PCI hardware interrupt

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 set and used for PCI slot 5 or 8 and 6 or 9. Further
exclusive interrupts for use at the slots are not available. PCI slots 5 and 6 are only available
with the bus module option with 5 PCI slots.
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 free
interrupt is then assigned to the slots. The lower free IRQ is assigned to the lower slot
number.
If a conflict arises due to the assignment, it is signaled accordingly. The alarm must be
acknowledged:
Resources Conflict. Please re-select [ok]
The interface that causes the conflict is automatically "disabled". For more information,
please refer to the chapter "Assignment of interrupts".
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Operating Instructions, 01/2014, A5E32997454-AA
SIMATIC IPC847D