Usb Function - MSI ATX BX2 User Manual

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PIIX4 Passive Release
The PIIX4
mode, which will now violate the spirit of the PCI specification. The systems
provides a programmable passive release mechanism to meet the required
master latencies. During Enabled, ISA masters may see long delays in
accessing PCI memory, including the main DRAM array. The ISA GAT mode
is also not supported during enable. ISA masters must honor IOCHRDY.
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PIIX4 Delayed Transaction
During Enabled, the PIIX4
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when the PIIX4 is the target of a PCI transaction. A read cycle from Host to
PCI is immediately retrived due to any pending PCI to DRAM cycle. During
Disabled, a read cycle from Host to PCI is waited until time-out due to any
pending PCI to DRAM cycle.

USB Function

Set this option to Enabled or Disabled the on-chip USB controller.
The Optional and Fail-Safe default settings are Disabled.
USB Keybd/Mouse Legacy Support
Set this option to Enabled or Disabled USB keyboard/mouse.
The Optional and Fail-Safe default settings are Disabled.
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ISA bridge support GAT (Guaranteed Access Time)
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4-13
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delay transaction mechanism is enabled