JETWAY P4X40DAR2A User Manual

JETWAY P4X40DAR2A User Manual Manual pdf 13 page image

112-5-2 Assigning IRQs For Expansion CardSome expansion cards need an IRQ to operate. Generally, an IRQ must exclusively assign toone use. In a standard design, there are 16 IRQs available but most of them are already in use.Standard Interrupt AssignmentsIRQ Priority Standard function0 N/A System Timer1 N/A Keyboard Controller2 N/A Programmable Interrupt3 * 8 Communications Port (COM2)4 * 9 Communications Port (COM1)5 * 6 Sound Card (sometimes LPT2)6 * 11 Floppy Disk Controller7 * 7 Printer Port (LPT1)8 N/A System CMOS/Real Time Clock9 * 10 ACPI Mode when enabled10 * 3 IRQ Holder for PCI Steering11 * 2 IRQ Holder for PCI Steering12 * 4 PS/2 Compatible Mouse Port13 N/A Numeric Data Processor14 * 5 Primary IDE Channel15 * 1 Secondary IDE Channel* These IRQs are usually available for ISA or PCI devices.2-5-3 Interrupt Request Table For This MotherboardInterrupt request are shared as shown the table below:INT A INT B INT C INT D INT E INT F INT G INT HSlot 1 √Slot 2 √Slot 3 √Slot 4 √Slot 5 √Onboard USB 1 √Onboard USB 2 √1394 √AC97/MC97 √IMPORTANT! If using PCI cards on shared slots, make sure that the drivers support“Shared IRQ” or that the cards don’t need IRQ assignments. Conflicts willarise between the two PCI groups that will make the system unstable orcards inoperable.