Acer Veriton 9100, Системное руководство

Страница: 112 / 131

BIOS Utility 3-31
Onboard SCSI2
This item allows you to manually assign the interrupt for the second
onboard SCSI device when the PCI IRQ Setting parameter is set to
Manual
. This parameter is grayed and not user-configurable when
the PCI IRQ Setting is set to
Auto
and when the second Onboard
SCSI parameter under the Onboard Devices Configuration screen is
set to
Disabled .
PCI Device Latency Timer
This parameter allows you to set the length of time for a PCI device
to use the PCI bus.
A PCI master can burst indefinitely as long as the target can
source/sink the data, and no other agent requests for the bus. If
another PCI device requests for the use of the PCI bus, a PCI bus
arbitration takes place, and the tenure of the device currently using
the PCI bus cannot go over the PCI latency time set in BIOS. This
setting depends on your application. For example, if you install a
high bandwidth block I/O card, e.g., FDDI, the longer the latency time
the better. This setting only affects the primary PCI components (PCI
slots 1, 2, 3, and onboard LAN). The secondary PCI components
(PCI slots 4, 5, and onboard SCSI1 and onboard SCSI2) are always
set to 20 PCI clocks.
PCI IRQ Sharing
Setting this parameter to
Yes
allows you to assign the same IRQ to
two different devices. To disable the feature, select No .
If there are no IRQs available to assign for
the remaining device function, we
recommend that you enable this parameter.