IEI Technology Rocky-3702EV User Manual page 29

USB Passive Release > to specify whether or not PIIX4
is allowed to use Passive Release while transferring control
data for USB transactions.
PIIX4 Passive Release > Enabled will let the Passive
Release mechanism encoded when CPU to PCI bus
accesses.
PIIX4 Delayed Transaction > to enable or disable the
embedded 32-bit posted write buffer which supports delay
transaction.
USB Function > to enable or disable the USB (Universal
Serial Bus) functions.
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