HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 22

Ultra DMA Controller, Interrupt Controller, Counter / Timer, Serial EEPROM, Power Management, Logic

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Page 22 highlights

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. 14

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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.