BIOS Setup Information
ROBO-638 User’s Manual
4-10
This item is used to allocate optimal graphics aperture size for AGP graphics
application. You can try to select other sub-options to fine tune the AGP and
system performance.
8bit I/O Recovery Time
This option specifies the length of the delay (in SYSCLKs) inserted between
consecutive 8-bit I/O operations.
16bit I/O Recovery Time
This option specifies the length of the delay (in SYSCLKs) inserted between
consecutive 16-bit I/O operations.
USB Passive Release
When enabled, this allows PIIX4 to use Passive Release to obtain better USB
performance while transferring control information or data for USB transactions.
When disabled, PIIX4 will perform PCI accesses for USB without using Passive
Release.
PIIX4 Passive Release
Choose the “Enabled” option to help raise the available bandwidth of the PCI bus
for acquiring higher PCI bus performance.
PIIX4 Delayed Transaction
Choose the “Enabled” option to obtain higher PCI bus performance for slower ISA
bus application.
USB Function
This option will enable on-chip USB function to support USB (Universal Serial
Bus) peripheral devices if user chooses the “Enabled” setting.
USB Keyboard Legacy Support
