MSI K7N2 User Guide - Page 55
ACR Advanced Communication Riser Slot, PCI Interrupt Request Routing
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MS-6570 ATX Mainboard ACR (Advanced Communication Riser) Slot The ACR slot allows you to insert the ACR expansion cards. The ACR specification supports modem, audio, Local Area Network (LAN), and Gigital Subscriber Line (DSL). The ACR interface combines existing communications buses, and introduces new and advanced communications buses answering industry demand for low-cost, high-performance communications peripherals. PCI Interrupt Request Routing The IRQ, acronym of interrupt request line and pronounced I-R-Q, are hardware lines over which devices can send interrupt signals to the microprocessor. The PCI IRQ pins are typically connected to the PCI bus PIRQ A# ~ PIRQ D# pins as follows: PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4 PCI Slot 5 AGP Onboard Serial ATA Order 1 PIRQ D# PIRQ A# PIRQ B# PIRQ D# PIRQ D# PIRQ D# PIRQ C# Order 2 PIRQ A# PIRQ B# PIRQ C# PIRQ A# PIRQ A# Order 3 PIRQ B# PIRQ C# PIRQ D# PIRQ B# PIRQ B# Order 4 PIRQ C# PIRQ D# PIRQ A# PIRQ C# PIRQ C# 2-34
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