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  1. #1
    ROG Member Array harrysun PC Specs
    harrysun PC Specs
    MotherboardASUS ROG Crosshair VI Hero
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    IRQ assignment explaint

    I'm studing the manuals and do not understand the IRQ assignment examples.

    Could someone explain me in details what those rows and columns does mean?
    I would like to have a motherbord where the important components do not share the IRQs, e.g. sound, net, storage and graphics.

    ASUS Z170 PRO GAMING


    ASUS Z170 PRO


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  2. #2
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
    ProcessorHaswell-EP E5-1680-3 SR20H/R2 (4.4GHz)
    Memory (part number)Vengeance LPX 4x8GB SS DDR4-3000 (CMK32GX4M4C3000C15)
    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
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    Sound CardJDS Labs O2+ODAC (RevB), USB2 UAC1
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    Storage #1Samsung 850 PRO 512GB SSDs, 4xSATA3 RAID0
    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
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    Short answer:
    Those tables are of no real importance, the mobo manufacturer provides them mostly to document their product for hardware developers, if you don't know what they mean then you can safely ignore them.

    Somewhat detailed answer:
    Those charts explain the hierarchy of IRQ priorities which are hardwired or hardcoded into the product. There's a limited number of IRQ lines which can be fed into each processor or subprocessor so they get lumped together as complexity and component counts rise.

    It's really not of much concern anyhow, unless you're trying to troubleshoot IRQ conflicts caused by legacy hardware. I haven't had to manually configure IRQ settings since somewhen around Windows 98, and even then it was only when using old modems or SoundBlaster cards which weren't fully Plug-n-Play compliant. I can't recall seeing an IRQ conflict in a Windows PC for over a decade, lol, aside from those I manually (and very deliberately) misconfigured for device testing. (And even when such conflicts occur, they are typically resolved through other layers of hardware and software fault-tolerance, chances are things will appear to work flawlessly, the user remains unaware of any issues, and it's so minor that it won't even appear in system status logs.)
    Last edited by Korth; 10-19-2015 at 06:34 PM.

  3. #3
    ROG Member Array harrysun PC Specs
    harrysun PC Specs
    MotherboardASUS ROG Crosshair VI Hero
    ProcessorAMD R7 1800X 8x@3975MHz
    Memory (part number)G.Skill Trident Z DIMM Kit 2x16GB (F4-3200C14D-32GTZ)
    Graphics Card #1VTX3D Radeon R9 390X
    Sound CardFiiO Olympus 2 E10K
    MonitorNEC MultiSync PA301W 2560x1600
    Storage #1Samsung SSD 960 EVO 1TB, M.2
    Storage #2Western Digital WD Red Pro 6TB, 3.5", SATA 6Gb/s
    CPU CoolerNoctua NH-D15 SE-AM4
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    This tables are part of the motherboard manual, without one sentense explaining them. So why ASUS is doing that if there is no need to concern about IRQ assignments?

    It's not true to have IRQ lines today. Refer to https://en.wikipedia.org/wiki/Messag...led_Interrupts

    I do not understand the colums in this tables. In witch case columns B-F are relevant? What have I todo in order the columns B-F become the case?
    Last edited by harrysun; 10-19-2015 at 07:07 PM.

  4. #4
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
    ProcessorHaswell-EP E5-1680-3 SR20H/R2 (4.4GHz)
    Memory (part number)Vengeance LPX 4x8GB SS DDR4-3000 (CMK32GX4M4C3000C15)
    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Graphics Card #2NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Sound CardJDS Labs O2+ODAC (RevB), USB2 UAC1
    MonitorASUS PG278Q
    Storage #1Samsung 850 PRO 512GB SSDs, 4xSATA3 RAID0
    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
    CPU CoolerRaijintek NEMESIS/TISIS, AS5, 2xNH-A14
    CaseObsidian 750D (original), 6xNH-A14
    Power SupplyZalman/FSP ZM1250 Platinum
    Headset Pilot P51 PTT *modded*
    OS Arch, Gentoo, Win7x64, Win10x64
    Network RouterActiontec T3200M VDSL2 Gateway
    Accessory #1 TP-Link AC1900 Archer T9E, 1xPCIe
    Accessory #2 ASUS/Infineon SLB9635 TPM (TT1.2/FW3.19)
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    Just follow the instructions your mobo's User Manual, plug your GPU card(s) and such into the proper slots, and you won't need to worry about exactly how the hardware layer operates. Those charts are provided for troubleshooting and development, if your hardware has no IRQ trouble (and it won't if it's plugged into the spots the mobo designers want it to be plugged into) and you're not a hardware developer then you can safely ignore these IRQ charts.

  5. #5
    ROG Member Array harrysun PC Specs
    harrysun PC Specs
    MotherboardASUS ROG Crosshair VI Hero
    ProcessorAMD R7 1800X 8x@3975MHz
    Memory (part number)G.Skill Trident Z DIMM Kit 2x16GB (F4-3200C14D-32GTZ)
    Graphics Card #1VTX3D Radeon R9 390X
    Sound CardFiiO Olympus 2 E10K
    MonitorNEC MultiSync PA301W 2560x1600
    Storage #1Samsung SSD 960 EVO 1TB, M.2
    Storage #2Western Digital WD Red Pro 6TB, 3.5", SATA 6Gb/s
    CPU CoolerNoctua NH-D15 SE-AM4
    CaseFractal Design Define R5 Blackout Win
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    Mouse Roccat Kone XTD, USB

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    I've no doubt about technical discrepancies with these boards, but nobody can explain to me what this charts describe.

  6. #6
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
    ProcessorHaswell-EP E5-1680-3 SR20H/R2 (4.4GHz)
    Memory (part number)Vengeance LPX 4x8GB SS DDR4-3000 (CMK32GX4M4C3000C15)
    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Graphics Card #2NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Sound CardJDS Labs O2+ODAC (RevB), USB2 UAC1
    MonitorASUS PG278Q
    Storage #1Samsung 850 PRO 512GB SSDs, 4xSATA3 RAID0
    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
    CPU CoolerRaijintek NEMESIS/TISIS, AS5, 2xNH-A14
    CaseObsidian 750D (original), 6xNH-A14
    Power SupplyZalman/FSP ZM1250 Platinum
    Headset Pilot P51 PTT *modded*
    OS Arch, Gentoo, Win7x64, Win10x64
    Network RouterActiontec T3200M VDSL2 Gateway
    Accessory #1 TP-Link AC1900 Archer T9E, 1xPCIe
    Accessory #2 ASUS/Infineon SLB9635 TPM (TT1.2/FW3.19)
    Accessory #3 ASUS OC Panel I (FW0501)
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    IRQ = Interrupt Request.

    It's a special signal which can be sent to a processor to force an interrupt, to make it halt whatever it was doing and execute new instructions instead. It's implemented at the electrical level, various other hardware subprocessors can send interrupts straight to the main CPU through dedicated pins (so a failed hard drive can send an error code, for example). It's evolved into a fairly complex thing on PCs, there are now entire hierarchies of IRQ priorities, maskable, nonmaskable, there's many flavours of interrupts of varying importance (some even interrupt each other) and they're embedded all throughout the electrical and logical layers. And there's all sorts of fault-tolerance, fallbacks, and failsafes which can shift electrical functions around so that even the interrupts can be passed along from chip to chip - the CPU gets all the glory but there's actually dozens of dedicated processors in a typical computer and they all need a "master" signalling standard to properly interact.

    Those charts describe a top-level IRQ prioritization, it's basically the "master" signalling standard, it's designed and hardwired into the mobo, it's for resolving (or at least identifying) hardware signalling conflicts. The need for users to worry about hardware IRQs largely disappeared with the last of the Pentiums - Asus provides this table to explain their motherboard "architecture" as part of the background documentation for the product. Mostly so that other hardware manufacturers (the people who make things like GPU cards, PCIe cards, SSDs, etc) can make things which work with this mobo,

    In the real world it's of no consequence unless you're using non-compliant hardware (something ancient, or modded, or prototyped, or entirely home-grown) which can't play nice with all the other IRQs - and even then, it's easier to reconfigure/reprogram the troublesome device than to shuffle all the other hardware around. You'd have a hard time selecting off-the-shelf PC hardware which creates hardware-level IRQ conflicts - let alone one which your BIOS and OS won't autocorrect. But PCs are supposed to be compatible with an astonishing array of hardware devices which even Asus cannot imagine, in theory even hardware which is over a quarter-century old, so Asus must provide the basic documentation.

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