307013-003 Datasheet, PDF (47/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Introduction
RTC
The ICH7 contains a Motorola* MC146818A-compatible real-time clock with 256 bytes
of battery-backed RAM. The real-time clock performs two key functions: keeping track
of the time of day and storing system data, even when the system is powered down.
The RTC operates on a 32.768 KHz crystal and a 3 V battery.
The RTC also supports two lockable memory ranges. By setting bits in the configuration
space, two 8-byte ranges can be locked to read and write accesses. This prevents
unauthorized reading of passwords or other system security information.
The RTC also supports a date alarm that allows for scheduling a wake up event up to
30 days in advance, rather than just 24 hours in advance.
GPIO
Various general purpose inputs and outputs are provided for custom system design.
The number of inputs and outputs varies depending on ICH7 configuration.
Enhanced Power Management
The ICH7’s power management functions include enhanced clock control and various
low-power (suspend) states (e.g., Suspend-to-RAM and Suspend-to-Disk). A hardware-
based thermal management circuit permits software-independent entrance to low-
power states. The ICH7 contains full support for the Advanced Configuration and Power
Interface (ACPI) Specification, Revision 3.0.
Intel^® Quick Resume Technology (Digital Home Only)
ICH7 implements Intel Quick Resume Technology that provides the capability to design
a PC with a single power button that reliably and instantly (user's perception) turns the
PC On and Off. When the system is On and the user presses the power button, the
display instantly goes dark, sound is muted, and there is no response to keyboard/
mouse commands (except for keyboard power button). When the system is Off and the
user presses the power button, picture and sound quickly return, and the keyboard/
mouse return to normal functionality, allowing user input.
Intel^® Active Management Technology (Intel^® AMT) (Desktop and
Mobile Only)
Intel Active Management Technology is the next generation of client manageability via
the wired network. Intel AMT is a set of advanced manageability features developed as
a direct result of IT customer feedback gained through Intel market research.
Intel ^® ICH7 Family Datasheet
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