Motherboard Resources
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2.3 Soft-Off Control
The motherboard design uses Soft-off control implemented under the SMM code in the BIOS.
Any power supply used with the AP440FX motherboard must support the Soft-off feature. The
ONCTL# pin of the I/O controller is connected to the Soft-off control line in the power supply
circuit. The registers in the I/O controller that set the I/O address and control the ONCTL# pin are
not setup until the SMM code is activated.
2.4 PCI Configuration Space Map
Table 30.
PCI Configuration Space Map
Bus Number (hex) Dev Number (hex) Function Number (hex) Description
00
00
00
Intel 82440FX (PMC) Host Bridge
00
07
00
Intel 82371SB (PIIX3 ) ISA bridge
00
07
01
Intel 82371SB (PIIX3 ) IDE Controller
00
07
02
Intel 82371SB (PIIX3) USB
00
08
00
Video Controller
00
13
00
PCI Expansion Slot: user available
00
11
00
PCI Expansion Slot: user available
00
0B
00
PCI Expansion Slot: Optional PCI
Expansion Slot for 3 slot Riser
2.5 DMA Channels
Table 31.
DMA Channels
DMA
Data Width
Resource
0
8- or 16-bits
Open
1
8- or 16-bits
Audio
2
8- or 16-bits
Floppy
3
8- or 16-bits
Parallel Port (for ECP/EPP Config.)
4
Reserved - Cascade channel
5
16-bits
Open
6
16-bits
Open
7
16-bits
Open
Summary of Contents for AP440FX
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