Introducing the BIOS

3-33

 

 

PIRQ_0 Use IRQ No. ~ PIRQ_3 Use IRQ No.:

Eleven options are available: Auto, 3, 4, 5, 7, 9, 10, 11, 12, 14, 15. Default setting is Auto. This item allows the system to automatically specify the IRQ number for the device installed on PCI slots. This means that the system can specify the fixed IRQ number for the device installed on the PCI slots (or onboard PCI devices). This is a useful function for when you want to fix the IRQ for a specific device.

For example, if you want to move your hard disk to another computer and don’t want to re-install Windows® NT or Windows® 2000, you can simply specify the IRQ for the device installed on the new computer to fit the original computer settings.

This feature is for the operating system that will record and fix the PCI configuration status if you want to change it.

For the relations between the hardware layout of PIRQ (the signals from the VIA VT8233A chipset), INT# (means PCI slot IRQ signals) and devices, please refer to the table below:

SIGNALS

PCI

PCI

PCI

USB

LAN

IEEE

HPT

AGP

Slot 1

Slot 2

Slot 3

2.0

 

1394

374

 

 

 

 

PIRQ_0 Assignment

INT B

INT A

INT D

x

INT A

x

x

INT A

PIRQ_1 Assignment

INT C

INT B

INT A

INT B

x

INT A

x

INT B

PIRQ_2 Assignment

INT D

INT C

INT C

INT C

x

x

INT A

x

PIRQ_3 Assignment

INT A

INT D

INT B

INT A

x

x

x

x

Note

!PCI slot 2 shares IRQ signals with the AGP slot.

!PCI slot 1 and USB controllers share an IRQ.

!If you want to install two PCI cards into those PCI slots that share IRQ with one another at the same time, you must make sure that your OS and PCI devices’ driver supports the IRQ sharing function.

User’s Manual