User Guide

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1.2.4 I/O Controller Hub : Intel 82801DBM

The Intel 82801DBM ICH4-M integrates three Universal Serial Bus 2.0 Host Controllers, the Audio Controller with

AC 97 Interface, the IDE Master/Slave controllers, and Intel®’ I/O Hub architecture. The PCI to LPC Bridge, I/O

Advanced Programmable Interrupt Controller, legacy system I/O and legacy power management functionalities are

integrated as well.

The integrated Universal Serial Bus Host Controllers features Dual Independent UHCI Compliant Host controllers

with six USB ports delivering 480 Mb/s bandwidth and rich connectivity. Besides, Legacy USB devices as well as

over current detection are also implemented.

The Integrated AC97 v2.3 compliance Audio Controller that features a 7-channels of audio speaker out and HSP v.90

modem support. Additionally, the AC97 interface supports 4 separate SDATAIN pins that is capable of supporting

multiple audio codecs with one separate modem codec.

The integrated IDE Master/Slave controllers features Dual Independent IDE channels supporting PIO mode transfers

up to 16 Mbytes/sec and Ultra DMA 33/66/100. It provides two separate data paths for the dual IDE channels that

sustain the high data transfer rate in the multitasking environment.

Intel 82801DBM ICH4-M supports 6 PCI masters and complies with PCI 2.2 specification. It also incorporates the

legacy system I/O like: two 82C37 compatible DMA controllers, Channels 0-3 are hardwired to 8 bit, three 8254

compatible programmable 16-bit counters channels 5-7, hardwired keyboard controller and PS2 mouse interface (not

use in MiTAC 8080 model), Real Time clock with 512Bytes CMOS SRAM and two 82C59 compatible Interrupt

controllers. Besides, the I/O APIC managing up to 14 interrupts with both Serial and FSB interrupt delivery modes is

supported.