User guide

Chapter 2: BIOS setup 2-17
Plug and Play O/S [No]
When set to [No], BIOS congures all the devices in the system. When set to [Yes] and if
you install a Plug and Play operating system, the operating system congures the Plug and
Play devices not required for boot.
Conguration options: [No] [Yes]
PCI Latency Timer [64]
Allows you to select the value in units of PCI clocks for the PCI device latency timer register.
Conguration options: [32] [64] [96] [128] [160] [192] [224] [248]
Allocate IRQ to PCI VGA [Yes]
When set to [Yes], BIOS assigns an IRQ to PCI VGA card if the card requests for an IRQ.
When set to [No], BIOS does not assign an IRQ to the PCI VGA card even if requested.
Conguration options: [Yes] [No]
Palette Snooping [Disabled]
When set to [Enabled], the palete snooping feature informs the PCI devices that an
ISA graphics device is installed in the system so that the latter can function correctly.
Conguration options: [Disabled] [Enabled]
IRQ-xx assigned to [PCI Device]
When set to [PCI Device], the specic IRQ is free for use of PCI/PnP devices. When set to
[Reserved], the IRQ is reserved for legacy ISA devices.
Conguration options: [PCI Device] [Reserved]
2.4.6 USB Conguration
The items in this menu allows you to change the USB-related features. Select an item then
press <Enter> to display the conguration options.
The Module Version and USB Devices Enabled items show the
auto-detected values. If no USB device is detected, the item shows None.
USB 1.1 Controller [Enabled]
Allows you to enable or disable the USB 1.1 Controller.
Conguration options: [Enabled] [Disabled]
USB 2.0 Controller [Enabled]
Allows you to enable or disable the USB 2.0 Controller.
Conguration options: [Enabled] [Disabled]
Legacy USB Support [Enabled]
Allows you to enable or disable support for USB devices on legacy operating systems
(OS). Setting to Auto allows the system to detect the presence of USB devices at startup.
If detected, the USB controller legacy mode is enabled. If no USB device is detected, the
legacy USB support is disabled.
Conguration options: [Disabled] [Enabled] [Auto]
USB 2.0 Controller Mode [HiSpeed]
Allows you to congure the USB 2.0 controller in HiSpeed (480 Mbps) or Full Speed (12
Mbps). Conguration options: [FullSpeed] [HiSpeed]