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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