SQ578
4-19
4.7.9
PCI Slots IRQ Priority
These options specify the IRQ priority for PCI devices installed in the PCI expansion
slots. The settings are
Auto, (IRQ) 3, 4, 5, 7, 9, 10,
and
11,
in priority order. The
default setting is
Auto.
§
PCI Slot1 IRQ Priority
§
PCI Slot2 IRQ Priority
§
PCI Slot3 IRQ Priority
4.7.10
DMA Channels
These options allow you to specify the bus type used by each DMA channel. The
settings are
PnP
or
ISA/EISA .
The default setting is
PnP.
§
DMA Channel 0
§
DMA Channel 1
§
DMA Channel 3
§
DMA Channel 5
§
DMA Channel 6
§
DMA Channel 7
4.7.11
IRQs Settings
These options specify the bus that the specified IRQ line is used on. These options
allow you to reserve IRQs for legacy ISA adapter cards. These options determine if
AMIBIOS should remove an IRQ from the pool of available IRQs passed to devices that
are configurable by the system BIOS. The available IRQ pool is determined by reading
the ESCD NVRAM. If more IRQs must be removed from the pool, the end user can use
these options to reserve the IRQ by assigning an
ISA/EISA
setting to it. Onboard I/O is
configured by AMIBIOS. All IRQs used by onboard I/O are configured as
PCI/PnP.
IRQ12
only appears if the
Mouse Support
option in Advanced Setup is set to
Disabled.
IRQ14 and 15 will not be available if the onboard PCI IDE is enabled. If all
IRQs are set to ISA/EISA and IRQ14 and 15 are allocated to the onboard PCI IDE,
IRQ9 will still be available for PCI and PnP devices, because at least one IRQ must be
available for PCI and PnP devices. The settings are
ISA/EISA
or
PCI/PnP.
The Optimal
and Fail-Safe default settings are
PCI/PnP.
§
IRQ3
§
IRQ4
§
IRQ5
§
IRQ7
§
IRQ9
Summary of Contents for SQ578
Page 1: ...SQ578 Pentium PCI Mainboard User s Manual...
Page 4: ......
Page 28: ......
Page 48: ...SQ578 4 20 IRQ10 IRQ11 IRQ12 IRQ14 IRQ15...
Page 57: ...SQ578 Documentation Rev Number A02 September 1997...
