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4-28
PCI Latency Timer:
The DEC (decimal) numbers from 0 to 255 are available, with the default setting at 32. This item can let
you set the PCI latency clock delay time. Which means, you can set how many clocks you want it delay.
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 (PCI slot
1 to PCI slot 5). 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 south brige 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
! 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.
! PCI slot 1 and slot 5 share IRQ signals with the Sil 3112A Serial ATA controller (supports Serial
ATA function). The driver for Sil 3112A Serial ATA controller supports IRQ sharing with other
PCI devices. But if you install a PCI card that doesn't allow IRQ sharing with other devices into
PCI slot 1 and 5, you may encounter problems. Furthermore, if your Operating System doesn't
allow peripheral devices to share IRQ signals with each other, such as Windows
you can't install a PCI card into PCI slot 1 and 5.
NF7/NF7-M/NF7-S
®
2000, you can simply specify the IRQ for the device installed on the new
PCI
PCI
Slot 1
Slot 2
INT C
INT B
INT D
INT C
INT A
INT D
INT B
INT A
PCI
PCI
Slot 3
Slot 4
INT A
INT D
INT B
INT A
INT C
INT B
INT D
INT C
Note
Chapter 4
PCI
Sil
Slot 5
3112A
INT C
X
INT D
X
INT A
INT A
INT B
X
®
NT for example,
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