Chapter 4
SG-71
4-26
Allocate IRQ to USB:
Two options are available: Disabled
Enabled. The default setting is
Enabled
. If you need free up
another IRQ, you can choose to disable this item to an IRQ. However, some situations in Windows
®
95
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
®
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 SiS 962L chipset), INT#
(means PCI slot IRQ signals) and devices, please refer to the table below:
SIGNALS
PCI
Slot 1
PCI
Slot 2
PCI
Slot 3
LAN AGP
PIRQ_0 Assignment
INT B
INT C
INT D
x
INT A
PIRQ_1 Assignment
INT C
INT D
INT A
INT A
INT B
PIRQ_2 Assignment
INT D
INT A
INT B
x
x
PIRQ_3 Assignment
INT A
INT B
INT C
x
x
Note
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.
Summary of Contents for SG-71
Page 2: ......
Page 50: ...Chapter 3 SG 71 3 18 ...
Page 84: ...Appendix A SG 71 A 4 ...
Page 88: ...Appendix B SG 71 B 4 ...
Page 92: ...Appendix C SG 71 C 4 ...
Page 110: ...Appendix H SG 71 H 6 ...
Page 114: ...Appendix I SG 71 I 4 ...