cPCI-MXS64 Technical Reference Manual
4-9
Chipset Features Setup (Continued)
Option
BIOS
Defaults
Setup
Defaults
Possible
Settings
Description
PCI/VGA Palette
Snoop
Dis. Dis. En./Dis. Palette snooping allows multiple VGA devices operating on
different buses to handle data from the CPU on each set of palette
registers.
When set to Enabled, data read and written by the CPU is
directed to both the PCI VGA device’s palette registers and the
ISA VGA device’s palette registers, permitting the palette registers
of both to be identical.
When set to Disabled, data read and written by the CPU is only
directed to the PCI VGA device’s palette registers.
Passive Release
En.
En.
En./Dis.
When Enabled, CPU to PCI bus accesses are allowed during passive
release otherwise the arbiter only accepts another PCI master access
to local SDRAM.
Delayed Transaction
Dis.
Dis.
En./Dis.
The chipset has an embedded 32-bit posted write buffer to support
delay transactions cycles. Select Enabled to support compliance with
PCI specifications version 2.1.
Supervisor I/O Base
Address
190h 190h 190h, 290h,
390h
This option determines the base address for the Supervisor I/O
Register, which is used for such functions as power fail detection
and the watchdog timer.
Power-Supply Type
AT
AT
AT, ATX
This option selects the type of power supply.
AGP Aperture Size
(MB)
64
64
4 to 256
This option selects the size in megabytes of the AGP Aperture.
Video BIOS Shadow
En.
En.
En./Dis.
C8000-CBFFF
En.
En.
En./Dis.
CC000-CFFFF
En.
En.
En./Dis.
D0000-D3FFF
En.
En.
En./Dis.
D4000-D7FFF
En.
En.
En./Dis.
D8000-DBFFF
En.
En.
En./Dis.
DC000-DFFFF
En.
En.
En./Dis.
Software that resides in a read-only memory (ROM) chip on a
device is called
firmware
. Award permits shadowing of firmware
such as the system BIOS, video BIOS, and similar operating
instructions that come with some expansion peripherals.
Shadowing copies from ROM into system RAM, where the CPU
can read it through the 64-bit DRAM bus. Firmware not shadowed
must be read by the system through the 8 or 16-bit ISA bus.
Shadowing improves the performance of the system BIOS and
similar firmware for expansion peripherals.
Enable shadowing into each section of memory separately. Many
system designers hardwire shadowing of the system BIOS and
eliminate a System BIOS Shadow option. Note that on a PCI VGA
card (on board or off-board), the VGA BIOS is always shadowed.
Video BIOS shadows into memory area C0000 plus the VGA
BIOS size. The remaining areas between C0000 and DFFFF
shown on the BIOS Features Setup screen may be occupied by
other expansion card firmware. If an expansion peripheral in your
system contains ROM-based firmware, you need to know the
address range the ROM occupies to shadow it into the correct
area of RAM.
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