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Chapter 7: BIOS
Above 4G Decoding
Select Enabled to allow a 64_bit_capable device to be decoded in the address
space above 4G if 64-bit_PCI_decoding is supported by the system. The options
are Enabled and Disabled.
PCI Common Settings
PCI Latency Timer
Select a value to be used by the PCI Latency Timer Register in bus clock calculation.
The options are 32 PCI Bus Clocks, 64 PCI Bus Clocks, 96 PCI Bus Clocks, 128
PCI Bus Clocks, 160 PCI Bus Clocks, 192 PCI Bus Clocks, 224 PCI Bus Clocks,
and 248 PCI Bus Clocks.
VGA Palette Snoop
If this feature is set to Enabled, a PCI card that does not have its own VGA color
palette built-in will detect a video_card palette to mimic it for color scheme support.
The options are Enabled and Disabled.
PERR# Generation
Select Enabled to allow a PCI device to generate a PERR number for a PCI Bus
Signal Error Event. The options are Enabled and Disabled.
SERR# Generation
Select Enabled to allow a PCI device to generate an SERR number for a PCI Bus
Signal Error Event. The options are Enabled and Disabled.
PCI Express Device Settings
Relaxed Ordering
Select Enabled to allow a PCI-E transaction to be completed prior to other transac-
tions that were already enqueued. This violates PCI strict-ordering rules. The options
are Enabled and Disabled.
Extended Tag
Select Enabled to allow a PCI-E device to use the 8-bit Tag fi eld as a requester.
The options are Enabled and Disabled.
No Snoop
Select Enabled to enable the "no_snoop bit" for a PCI-E device, which will reduce
front_side bus traffi c for performance enhancement. The options are Enabled and
Disabled.
7-5
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