Abit SG-71 User Manual page 76

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Allocate IRQ to USB:
Two options are available: Disabled
another IRQ, you can choose to disable this item to an IRQ. However, some situations in Windows
may cause the USB port to malfunction or experience other problems!
PCI Latency Timer(CLK):
The DEC (decimal) numbers from 0 to 255 are available, with the default setting at 32. This option
selects the controls for the amount of time that the SiS 962L arbiter allows a PCI initiator to perform
multiple back-to-back transactions on the PCI bus.
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
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 SiS 962L chipset), INT#
(means PCI slot IRQ signals) and devices, please refer to the table below:
SIGNALS
PIRQ_0 Assignment
PIRQ_1 Assignment
PIRQ_2 Assignment
PIRQ_3 Assignment
PCI slot 3 and LAN 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.
SG-71
Enabled. The default setting is Enabled. If you need free up
®
2000, you can simply specify the IRQ for the device installed on the new
PCI PCI PCI
Slot 1 Slot 2 Slot 3
INT B INT C INT D
INT C INT D INT A
INT D INT A INT B
INT A INT B INT C
LAN AGP
x INT A
INT A INT B
x x
x x
Note
Chapter 4
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