Intel AP440FX specifications Soft-Off Control, PCI Configuration Space Map, DMA Channels

Motherboard Resources

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

00

00

00

00

00

00

07

07

07

08

13

11

0B

00

00

01

02

00

00

00

00

Intel 82440FX (PMC) Host Bridge

Intel 82371SB (PIIX3 ) ISA bridge

Intel 82371SB (PIIX3 ) IDE Controller

Intel 82371SB (PIIX3) USB

Video Controller

PCI Expansion Slot: user available

PCI Expansion Slot: user available

PCI Expansion Slot: Optional PCI Expansion Slot for 3 slot Riser

2.5 DMA Channels

Table 31. DMA Channels

DMA

0

1

2

3

4

5

6

7

Data Width

8- or 16-bits

8- or 16-bits

8- or 16-bits

8- or 16-bits

16-bits

16-bits

16-bits

Resource

Open

Audio

Floppy

Parallel Port (for ECP/EPP Config.)

Reserved - Cascade channel

Open

Open

Open

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