Introduction

Using Interrupt Mode, IRQ resource limitations must be considered.

...

This Application Note explains, how the Interrupt Number is assigned by the System and how to search for a free interrupt number in case of shared IRQ.

Physical Interrupt Number

With PCI / PCIE hardware, interrupt numbers are distributed to the hardware either by the BIOS or the operating system.

...

By changing the view in the device manager to "resources by type", the assigned IRQ number for each device is shown:

Assign exclusive Interrupt

Since it is part of the BIOS and the operating system to distribute hardware resources, there is no way to do this manually.

Searching for a free Interrupt

Changing card slots can work to a limited extent.

...

Nevertheless, it could happen that next time the system is started, it reconfigures another device in such a way, that there is a shared interrupt again.

Interrupt and CIFX Device Driver (INtime)

If the driver identifies a CIFX Card, the CIFX Card will be integrated to its administrative structure.

...

or: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cifXDrv\DeviceConfig\Slot\(Slot_Number)

Activate Interrupt Mode

For the interrupt to be enabled, there must be an Interrupt assigned to the Hardware.

...