Intel ® Ich4 Pci Interface; Intel ® Ich4 Real Time Clock; Intel ® Ich4 Usb Controller; Pci Bus - IEI Technology NANO-4386A2 User Manual

®
2.6.5 Intel ICH4 PCI Interface
The ICH4 PCI interface provides a 33 MHz, Rev. 2.2 compliant implementation. All PCI
signals are 5 V tolerant, except PME#. The ICH4 integrates a PCI arbiter that supports up
to six external PCI bus masters in addition to the internal ICH4 requests.
®
2.6.6 Intel ICH4 Real Time Clock
256 bytes of battery backed RAM is provided by the Motorola MC146818A real time clock
(RTC) integrated into the ICH4. The RTC operates on a 3V battery and 32.768KHz crystal.
The RTC keeps track of the time and stores system data even when the system is turned
off.
®
2.6.7 Intel ICH4 USB Controller
Up to six high-speed, full-speed or low-speed USB devices are supported by the ICH4.
High-speed USB 2.0, with data transfers of up to 480Mb/s, is enabled with the ICH4
integrated Enhanced Host Controller Interface (EHCI) compliant host controller. USB
full-speed and low-speed signaling is supported by the four ICH4 integrated Universal
Host Controller Interface (UHCI) controller.

2.7 PCI Bus

The PCI bus controller on the ICH4 southbridge is compliant with PCI Revision 2.2
specifications and has a 33 MHz PCI clock.

2.8 LPC Bus Components

2.8.1 LPC Bus Overview

The LPC bus is connected to components listed below:

BIOS chipset

Super I/O chipset
2.8.2 BIOS Chipset
Page 18
NANO-4386A2 Motherboard