14
2 System Board
Chip-Set
Ultra DMA Controller The seven channel DMA controller incorporates the functionality of two
82C37 DMA controllers. Channels 0 to 3 are for 8-bit DMA devices, while
channels 5 to 7 are for 16-bit devices (see page 56
). The channels can be
programmed for any of the four transfer modes: the three active modes
(single, demand, block), can perform three different types of transfer: read,
write and verify. The address generation circuitry supports a 24-bit address
for DMA devices.
Interrupt Controller Based on two 82C59: 15 interrupts supported (edge/level triggered). It also
supports the onboard I/O APIC controller 82093AA.
Counter / Timer The chip contains a three-channel 82C54 counter/timer. The counters use a
division of the 14.318 MHz OSC input as the clock source.
Serial EEPROM This is the non-volatile memory which holds the values for the Setup
program.
Power Management
Logic
The PIIX4 chip provides full support for Advanced Configuration and Power
Interface (ACPI) and O/S Directed Power Management.
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