MSI MS-6580-060 User Guide - Page 50
PCI Interrupt Request Routing
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MS-6580 ATX Mainboard PCI Interrupt Request Routing The IRQ, abbreviation of interrupt request line and pronounced I-R-Q, are hardware lines over which devices can send interrupt signals to the microprocessor. The "AGP/PCI/USB/LAN" IRQ pins are typically connected to the PCI bus INT A# ~ INT H# pins as follows: Order 1 Order 2 Order 3 Order 4 AGP INT A# INT B# PCI Slot 1 INT A# INT B# INT C# INT D# PCI Slot 2 INT B# INT C# INT D# INT A# PCI Slot 3 INT C# INT D# INT A# INT B# PCI Slot 4 INT D# INT A# INT B# INT C# PCI Slot 5 INT B# INT C# INT D# INT A# PCI Slot 6 INT A# INT B# INT C# INT D# USB1.1 Controller 1 INT A# USB1.1 Controller 2 INT D# USB1.1 Controller 3 INT C# USB2.0 Controller INT H# LAN Controller INT E# AGP & PCI Slot 1 & PCI Slot 6 & USB1.1 Controller 1 shared INT A#. PCI Slot 2 & PCI Slot 5 shared INT B#. PCI Slot 3 & USB1.1 Controller 3 shared INT C#. PCI Slot 4 & USB1.1 Controller 2 shared INT D#. 2-30
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