MSI RS480M2 User Manual
Page 53
3-22
MS-7093 M-ATX Mainboard
IRQ Resources
The items are adjustable only when Resources Controlled By is set to [Manual].
Press <Enter> and you will enter the sub-menu of the items. IRQ Resources list IRQ
3/4/5/7/9/10/11/12/14/15 for users to set each IRQ a type depending on the type of
device using the IRQ. Settings are:
[PCI Device]
For Plug & Play compatible devices designed for PCI bus
architecture.
[Reserved]
The IRQ will be reserved for further request.
PCI/VGA Palette Snoop
W hen set to [Enabled], multiple VGA devices operating on different buses can handle
data from the CPU on each set of palette registers on every video device. Bit 5 of the
command register in the PCI device configuration space is the VGA Palette Snoop bit
(0 is disabled). For example, if there are two VGA devices in the computer (one PCI
and one ISA) and the:
The setting must be set to [Enabled] if any ISA bus adapter in the system requires
VGA palette snooping.
Assign IRQ for VGA/USB
The items allow you to assign an IRQ line to the VGA card and USB device separately.
Options: [Enabled], [Disabled].
PCI Latency Timer (CLK)
This feature controls how long each PCI device can hold the bus before another
takes over. The larger the value, the longer the PCI device can retain control of the
bus. As each access to the bus comes with an initial delay before any transaction
can be made, low values for the PCI Latency Timer will reduce the effective PCI
bandwidth while higher values improve it. Key in a DEC number between [0] and
[255].
M aximum Payload Size
This setting specifies the maximum TLP payload size for the PCI Express devices.
The unit is byte. Setting options: [128], [256], [512], [1024], [2048], [4096].
VGA Palette Snoop
Bit Setting
Action
D is abled
Data read or written by the CPU is only directed to the PCI
VGA device
’s palette registers.
Enabled
Data read or 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
VGA devices to be identical.