1 pch-io configuration, Pch-io configuration, Sb crid – ADLINK aTCA-9300 User Manual

Page 65: High precision timer

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6.4.1 PCH-IO

Configuration

SB CRID

It is for setting the support for PCH Compatibility Revision ID (CRID) functionality

High Precision Timer

The High Precision Event Timer is a hardware timer used in personal computers.
A High Precision Event Timer chip consists of a 64-bit main counter counting at
least at 10MHz and a set of up to 256 comparators. HPET is programmed via a
memory mapped I/O window that is discoverable via ACPI. The HPET circuit in
modern PCs is integrated into the southbridge.

The HPET can produce periodic interrupts at a much higher resolution than the
RTC. This option allows user to enable or disable High Precision Event Timer.

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