44
3.7.3 Reset Configuration Data
When enabled, the extended configuration data (ESCD) will be cleared during each boot time.
Options
Enabled
Disabled (*)
3.7.4 IRQ 3 / 4 / 5 / 7 / 9 / 10 / 11 / 12 / 14 / 15 assigned to
DMA 0 / 1 / 3 / 5 / 6 / 7 assigned to
If the Resources Controlled By field is set as Manual, these resource fields can be assigned by the
user.
Options
Description
Legacy ISA
Resource will not be assigned to any PnP device
PCI/ISA PnP
Resource is available to PnP devices
3.7.5 PCI IDE IRQ Map To
This field configures the IRQ channel for the add-in PCI IDE controller.
PCI devices are categorized as follows to specify their interrupt grouping:
INT A: By default, all add-in cards that require only one interrupt are in this category.
For almost all cards that require more than one interrupt, the first interrupt on the
card is also classified as INT A.
INT B: Generally, the secondary interrupt on add-in cards that require two or more
interrupts is classified as INT B.
INT C and INT D: A third interrupt on add-in cards is classified as INT C and a fourth
interrupt is classified as INT D.
The PCI-to-ISA bridge supports four programmable PIRQ signals and can connect each PIRQ
line internally to one of the IRQ signals (3, 4, 5, 7, 9, 10, 11, 12, 14, and 15). Any PCI interrupt
source (either onboard or from a PCI add-in card) connects to one of these PIRQ signals. Because
there are only four signals, some PCI interrupt sources are mechanically tied together on the
motherboard and share the same interrupt.
The following table describes the PCI interrupt routine of this motherboard:
PCI#1
PCI#2
PCI#3
PCI#4
PIRQA
INTA
INTB
INTC
INTD
PIRQB
INTB
INTC
INTD
INTA
PIRQC
INTC
INTD
INTA
INTB
PIRQD
INTD
INTA
INTB
INTC
