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Chapter 4
PCI/PnP Setup
Choose PCI/Plug and Play Setup from the AMIBIOS Setup screen to
display the PCI and Plug and Play Setup options, described below.
Plug and Play Aware O/S
Set this option to Yes to inform AMIBIOS that the operating system
can handle plug and Play (PnP) devices. The settings are No or Yes.
The Optimal and Fail-Safe default settings are No.
PCI Latency Timer (PCI Clocks)
This option specifies the latency timings (in PCI clocks) for PCI
devices installed in the PCI expansion slots. The settings are 32, 64,
96, 128, 160, 192, 224, or 248. The Optimal and Fail-Safe default
settings are 64.
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 this field is set for:
This option must be set to Enabled if any ISA adapter card installed in
the system requires 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 the VGA device on the PCI
bus. The settings are Yes or No. The Optimal and Fail-Safe default
settings are Yes.
Setting
Description
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's palette registers and
the ISA VGA device palette registers, permitting the palette registers of both devices to be identical.
