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114 Appendix C: BIOS reference for Matrox Supersight SHB-5520
Item
Options
PCI ROM Priority
Legacy ROM
EFI Compatible ROM*
Above 4G Decoding
Disabled*
Enabled
PCI Latency Timer
32 PCI Bus Clocks*
64
96
128
160
192
224
248
VGA Palette Snoop
Disabled*
Enabled
PERR# Generation
Disabled*
Enabled
SERR# Generation
Disabled*
Enabled
Relaxed Ordering
Disabled*
Enabled
Meaning
This item allows the BIOS to prioritize which set of instructions (stored on a ROM) will be executed first.
When set to EFI Compatible ROM, the extensible firmware interface (EFI) instructions (stored on a ROM) are
executed first. EFI defines the software interface between an operating system and platform firmware (for
example, Microsoft Windows XP and your Matrox Supersight unit).
When set to Legacy ROM, the instructions (stored on a ROM) for a legacy device (for example, non-plug and
play compatible devices and/or ISA devices) are executed first.
Note that the default setting of this value is optimized for the Matrox Supersight SHB-5520 board.
❖
This item allows you to enable the mapping of supported PCI devices above 4 Gbytes. By default, Matrox
Supersight maps supported PCI devices below the 4-Gbyte barrier. Refer to your Microsoft Windows
documentation for more information.
This item allows you to change the default value of the PCI latency timer, in clock cycles. The PCI latency
timer allows PCI devices to share the PCI bus. Each PCI device must use the same PCI latency timer to limit
the time the PCI device can hold the PCI bus. The timer starts when the device begins PCI bus ownership,
and counts down. When the latency timer has reached zero, the PCI device releases the bus and another PCI
device can hold it.
This item should be left at its default setting.
❖
This item allows you to enable video palette snooping on display boards. Video palette snooping is typically
only required with legacy display boards. The VGA palette is the set of colors that are in use by the display
board when it is in 256-color mode. Since there are thousands of colors and only 256 can be used in VGA
mode, the settings of the display board are examined and a pallet containing the currently-used colors is
generated.
Note that the default setting of this value is optimized for the Matrox Supersight SHB-5520 board.
❖
This item allows you to enable listening for a PERR# (parity error) signal from a PCI device. The signal
denotes a parity error has occurred on a PCI device.
Note that the default setting of this value is optimized for the Matrox Supersight SHB-5520 board.
❖
This item allows you to enable listening for a SERR# (system error) signal from a PCI device. This signal
denotes address parity errors, data parity errors that did not cause a PERR, and critical errors other than
parity.
Note that the default setting of this value is optimized for the Matrox Supersight SHB-5520 board.
❖
This item allows you to enable relaxed ordering on the PCI bus. Relaxed ordering allows the PCI bus to
rearrange the transactions on the bus, so that higher priority requests are processed before lower priority
requests. This item can help minimize latency with some types of PCI/PCIe transactions.
When set to Disabled, PCI/PCIe transactions are processed in the order in which they are received.
When set to Enabled, PCI/PCIe transactions are processed out of the order in which they are received. This
can lead to delays and time-outs.
Note that the default setting of this value is optimized for the Matrox Supersight SHB-5520 board.
❖
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