Memory Configuration and BIOS Settings 6-19
DMA 0/1/3/5/6/7
assigned to
These items define the DMA assigned to the ISA
buses. It is not available for PCI slots.
The available settings are Legacy ISA and
PCI/ISA PnP.
Assign IRQ for USB
Specifies whether to assign an IRQ line to the
on-board USB controller.
Since the on-board controller is always enabled ,
if no IRQ line is assigned to it, an error will be
reflected on the system device under windows 95
Device Manager.
PCI Latency Timer
The PCI Latency Timer is used to ensure that the
PCI agents are given a minimum amount of the
system resource.
The number of clocks programmed in the PCI
Latency Timer represents the guaranteed time
slice allocated to the 440BX, after which it must
complete the current data transfer phase and
surrender the bus as soon as its bus grant is
removed.
The default setting is 64 PCI clocks.
MS IRQ Routing
Table
Specifies whether the BIOS IRQ Routing Table is
enabled or disabled.
PCI IDE IRQ Map to
This item defines the type of IDE disk controller
in use in your system. By default, Setup assumes
that your controller is an ISA device rather than a
PCI controller.
If you have equipped your system with a PCI
controller, changing this setting allows you to
specify which slot has the controller and which
PCI interrupt (A, B, C or D) is associated with the
connected hard drives.
Remember that this setting refers to the hard disk
drive itself, rather than individual partitions.
Since each IDE controller supports two separate
hard disk drives, you can select the INT# for each.
Note that the Primary has a lower interrupt than
the Secondary as described in “Slot x Using
INT#” above.
Selecting the PCI Auto setting allows the system
to automatically determine the configuration of
your IDE disk system.
Table 6-8:
The PnP/PCI Configuration Screen items.
Item
Description