Asus M2A74-AM SE - Manual (Page 35)

Chapter 2: BIOS information 2-11
Take caution when changing the settings of the PCI PnP menu items. Incorrect field values
can cause the system to malfunction.
Plug and Play O/S [No]
When set to [No], BIOS configures all the devices in the system. When set to [Yes] and if
you install a Plug and Play operating system, the operating system configures the Plug and
Play devices not required for boot. Configuration options: [No] [Yes]
2.4.6 USB Configuration
The items in this menu allows you to change the USB-related features. Select an item then
press to display the configuration 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 Functions [Enabled]
Enables or disables the USB functions. Configuration options: [Enabled] [Disabled]
USB 2.0 Controller [Enabled]
Enables or disables the USB 2.0 Controller. Configuration options: [Enabled] [Disabled]
Legacy USB Support [Auto]
Allows you to enable or disable support for Legacy USB storage devices, including USB flash
drives and USB hard drives. 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. Configuration options: [Disabled] [Enabled]
[Auto]
USB 2.0 Controller Mode [HiSpeed]
Allows you to configure the USB 2.0 controller in HiSpeed (480 Mbps) or Full Speed
(12 Mbps). Configuration options: [FullSpeed] [HiSpeed]
HDAudio Controller [Enabled]
Allows you to enable or disable the HD Audio Controller. Configuration options: [Disabled]
[Enabled]
Front Panel Select [HD Audio]
Allows you to set the HD audio mode. Configuration options: [AC97] [HD Audio]
Onboard LAN Controller [Enabled]
Allows you to enable or disable the Onboard LAN. Configuration options: [Enabled] [Disabled]
Onboard LAN Boot ROM [Disabled]
Allows you to enable or disable the Onboard LAN Boot ROM. Configuration options:
[Enabled] [Disabled]
2.4.5 PCI PnP
The PCI PnP menu items allow you to change the advanced settings for PCI/PnP devices.
The menu includes setting IRQ and DMA channel resources for either PCI/PnP or legacy ISA
devices, and setting the memory size block for legacy ISA devices.