PCI IRQ Activated By

Common Options : Edge, Level

Quick Review

This BIOS feature allows you to set the method by which the IRQs for your PCI devices are activated or triggered.

ISA and old PCI devices are edge-triggered (using a single voltage level) while newer PCI and AGP devices are level-triggered (using multiple voltage levels). This is important mainly because PCI devices must be level-triggered to share IRQs.

Because all PCI devices currently in the market are level-triggered, it is recommended that you set this BIOS feature to Level so that your PCI devices can share IRQs.

But if you are still using old edge-triggered devices, select Edge to force the chipset to allow only edge-triggering of PCI devices. This may cause configuration problems if there are IRQ conflicts but it will prevent system lockups that can occur if the chipset erroneously attempts to level-trigger an edge-triggered PCI device.

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