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Chapter3 BIOS Setup
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User’s Manual
3.7 PCI Plug and Play Setup
Both the ISA and PCI buses on the CPU card use system IRQs & DMAs. You must set up the IRQ and DMA
assignments correctly through the PCI / Plug and Play Setup utility, otherwise the SBC will not work
properly.
When you select the “PCI / PLUG AND PLAY SETUP” on the main program, the screen display will appears
as:
PCI / Plug and Play Setup Screen
AMIBIOS SETUP – PCI / PLUG AND PLAY SETUP
© 2001 American Megatrends, Inc. All Rights Reserved
Plug and Play Aware O/S No Available Options:
PCI Latency Timer (PCI Clocks) 32
f
No
Allocate IRQ to PCI VGA Yes Yes
DMA Channel 0 PnP
DMA Channel 1 PnP
DMA Channel 3 PnP
DMA Channel 5 PnP
DMA Channel 6 PnP
DMA Channel 7 PnP
IRQ3 ISA / EISA
IRQ4 ISA / EISA
IRQ5 PCI / PnP
IRQ7 ISA / EISA
IRQ9 PCI / PnP
IRQ10 PCI / PnP
IRQ11 PCI / PnP
IRQ14 PCI / PnP ESC : Exit ↑↓ : Sel
IRQ15 PCI / PnP PgUp/PgDn : Modify
F1: Help F2/F3 : Color
PCI/PnP Setup options are displayed by choosing the PCI/PnP Setup icon from the AMI BIOS Setup main
menu. All PCI/PnP Setup options are described in this section.
Plug and Play Aware O/S: Set this option to “ Yes” if the operation system installed in the computer is
Plug and Play-aware. BIOS only detects and enables PnP ISA adapter cards that are required for system
boot. The Windows 95 operating system detects and enables all other PnP-aware adapter cards. Windows
95 is PnP-aware. Set this option to “ No” if the operating system (such as DOS, OS/2, Windows 3.x) does
not use PnP.
PCI Latency Timer (PCI Clocks): This option is used to control PCI latency timer period (follow PCI
clocks). Based on PCI specification 2.1 or later and PCI bus frequency in system, user can select different
timer to meet their PCI bus environment.
Allocate IRQ to PCI VGA: This option will be used to allocate IRQ for PCI VGA card. In general, some of
PCI VGA cards needs IRQ support.
DMA Channel 0/1/3/5/6/7: These items specify the bus that the system DMA(Direct Memory Access)
channel is used. The settings determine if AMIBIOS should remove a DMA from the available DMAs passed
to devices that are configurable by the system BIOS. The available DMA pool is determined by reading the
ESCD NVRAM. If more DMAs must be removed from the pool, the end user can reserve the DMA by
assigning an ISA/EISA setting to it.