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Bitfields for Intel 82371FB/82371SB/82371MX motherboard IRQ Route Control

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Bit Description

7

disable IRQ routing

6

enable MIRQx/IRQx sharing

5

(82371SB only) enable IRQ0 output

4

reserved (0)

3 - 0

ISA IRQ number to which to route the PCI IRQ

Note:

IRQs 0-2, 8, and 13 are reserved.
Interrupt sharing should only be enabled when the device connected to the MIRQ line and the device connected to the IRQ line both produce active high, level triggered interrupts.

See Also:

#01167,#01168,#01216,#01219