Chapter 2 AMIBIOS Setup
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Section 5
PCI/PnP Setup
Choose PCI/PnP Setup AMIBIOS Setup main menu. All PCI/PnP Setup
options are described in this section.
Plug and Play-Aware OS Set this option to Yes if the operating system in this computer
follows the Plug and Play specification. Windows 95 is PnP-aware. The
settings are Yes or No. The Optimal and Fail-Safe default settings are No.
PCI VGA Palette Snoop When this option is set to Enabled, multiple VGA devices operating
on different buses can handle data from the CPU on each set of palette
registers on every video device. Bit 5 of the command register in the PCI
device configuration space is the VGA Palette Snoop bit (0 is disabled). For
example: if there are two VGA devices in the computer (one PCI and one
ISA) and the VGA Palette Snoop bit is:
Snoop Bit
Action
Disabled
Data read and written by the CPU is only directed to the PCI
VGA device's palette registers.
Enabled
Data read and written by the CPU is directed to the both the PCI
VGA device palette registers and the ISA VGA device palette
registers, and the palette registers of both devices can be
identical.
This option must be set to Enabled if an ISA adapter card installed in the
system uses VGA palette snooping. The Optimal and Fail-Safe default
settings are Disabled.
Allocate IRQ to PCI VGA Set this option to Yes to allocate an IRQ to a VGA adapter card
that uses the PCI local bus. The settings are Yes or No. The Optimal and Fail-
Safe default settings are No.
USB Device Latency Timer This option specifies the latency timings (in PCI clocks) for USB
devices installed in the computer. The USB Function option in Chipset Setup
must be set to Enabled before this option can be selected. The settings are 32,
64, 96, 128, 160, 192, 224, or 248. The Optimal and Fail-Safe default settings
are 64.
Cont’d