PCI/Plug and Play SetupCBI/CGI Technical Reference
Chassis Plans. 7-3
Available options are:
No
Yes
PCI Latency Timer (PCI Clocks)
This option specifies the latency of all PCI devices on the PCI Local Bus. The settings
are in units equal to PCI clocks.
The Setup screen displays the system option:
PCI Latency Timer (PCI Clocks) 64
Available options are:
32 160
64 192
96 224
128 248
PCI VGA Palette Snoop
Palette snooping allows multiple VGA devices operating on different buses to handle
data from the processor on each set of palette registers on every video device, e.g. if there
are two VGA devices in your system (one PCI and one ISA). Bit 5 of the command
register in the PCI device configuration space is the VGA Palette Snoop bit (0 is
disabled).
This option must be set to Enabled if any ISA adapter card installed in the system
requires VGA palette snooping.
The Setup screen displays the system option:
PCI VGA Palette Snoop Disabled
Two options are available:
•Disabled - Data read and written by the processor is only directed to the PCI
VGA device's palette registers.
•Enabled - Data read and written by the processor 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 devices to be identical.
PCI IDE BusMaster
This option specifies whether the IDE controller on the PCI Local Bus has bus mastering
capability. AMIBIOS can perform bus master transfers using scatter/gather DMA on the
PCI IDE interface. No special drivers are needed, but the IDE drive must support PCI
bus mastering.