Irq Assignments

Irq Assignments-45
The various 'INT' entries in the other columns relating to each of the PCI expansion slots are exactly the same as those I discussed in my feature — each slot has four physical connections to be allocated to up to four interrupt lines, generally given the letter-based names Int A, Int B, Int C and Int D rather than numbers to avoid confusing them with system IRQs.As I also said previously, if an interrupt is required by any expansion card, like your Powercore, Int A is nearly always assigned, leaving the other three for possible use in a multi-function device.So, for instance, the Audigy 2 soundcard uses A for its main audio/MIDI portion, and B for its IEEE 1394 Host Controller.

The various 'INT' entries in the other columns relating to each of the PCI expansion slots are exactly the same as those I discussed in my feature — each slot has four physical connections to be allocated to up to four interrupt lines, generally given the letter-based names Int A, Int B, Int C and Int D rather than numbers to avoid confusing them with system IRQs.As I also said previously, if an interrupt is required by any expansion card, like your Powercore, Int A is nearly always assigned, leaving the other three for possible use in a multi-function device.So, for instance, the Audigy 2 soundcard uses A for its main audio/MIDI portion, and B for its IEEE 1394 Host Controller.

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Basically every PCI device in your system is using an IRQ to allow access to the hardware.

On critical configurations it is best if your DSP24 PCI card us using a unique IRQ that has not been assigned to any other device in the same system.

The reason for that is that the PCI hardware itself and its driver are not affecting the IRQ assignment at all (if the hardware follows the PCI 2.1 specifications as the DSP24 series of cards).

The IRQ is assigned by the Plug and Play section of the BIOS on your mainboard.

Take note of IRQ13 (Numeric Data processor) that we will use in this example: 3.

Create a new DWORD value in this key, and call it IRQ#Priority, where # is the IRQ of the device you wish to prioritize (e.g., IRQ13Priority for IRQ 13, which is your numeric processor). Double-click the new value, and enter a number for its priority. Make sure not to enter the same priority number for two entries, and keep it simple by experimenting with only one or two values at first. Close the Registry Editor and reboot your computer when you’re done. If you still can't get a unique IRQ for your Powercore card, try setting your 'PNP OS Installed' BIOS parameter to 'No', so the BIOS will allocate IRQs, and then force the appropriate PIRQ to use your choice with the four 'PIRQ_X Use IRQ No' settings mentioned earlier. This however means that conflicts with other busmaster devices and PCI cards need to be avoided or you may get drop-outs when you record or playback audio signals with low latency.My Audiophile currently has an IRQ to itself and so I'm not touching it. In my BIOS, it's not immediately clear how to specify which IRQ is for which slot, since it only allows me to set each IRQ to 'PCI Slot' or 'Reserve'.I don't understand what reserving means, but I have all the IRQs assigned to PCI, so why do some PCI slots need to share?When we do this, we discover that: Even though you may have one or more 'spare' IRQs not allocated to anything, it's the hard-wiring of the slots that determines what shares with what, and you can't avoid this.The two USB ports provided by each USB Host Controller always share an IRQ, and the notes beneath the table suggest that this is shared with PCI slot 4, but, since slots 3 and 4 share, this isn't borne out by your Audiophile in slot 3 getting its own unique IRQ.Some users have gotten good results prioritizing IRQ 8 (for the system CMOS) and the IRQ corresponding to the video card, but the feedback is unconfirmed. My motherboard manual says PCI 4 shares an IRQ with the two USB ports, and that PCI 1 shares with the AGP.Unfortunately some Abit tables have subsequently proved to have printing errors (the AT7-MAX for instance), but let's assume yours is correct.The PIRQ signals in the left-hand column are those from the VIA VT8233 chip set on your motherboard — only four unique interrupts are available to PCI slots (PIRQ 0 to 3), but as explained elsewhere in your motherboard manual, you can if you wish assign whatever IRQ number you like to each one using the four 'PIRQ_X Use IRQ No' settings in your BIOS.

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