User manual

USB Conguration

Figure 2.7 USB

Conguration sub-menu

Legacy USB Support

Whenenabled,theBIOSwillenablelegacysupportforUSBkeyboards,miceandoppydrives.Youwillbe

able to use these USB devices even with operating systems that do not support USB.

EHCI Hand-Off

This item allows you to enable support for operating systems without an EHCI hand-off feature.

USB transfer time-out

ThisitemallowsyoutospecictheUSBtransfertimeoutvalueforcontrol,bulk,andinterrupttransfers.

Device reset time-out

ThisitemallowsyoutospecicthetimeoutperiodsforUSBdeviceinitializationandtheStartUnitcommand

to enable mass storage access operations.

Device power-up delay

This item allows you to select the time for devices report themselves to the Host Controller, including through

USB hubs. When set to Auto, root port devices will be given 100 ms, while devices connected to hubs will

begiventimeasspeciedintheHubdescriptorWhenthisparameterissettoManual,adelayfrom1to40

seconds can be selected.