ADLINK aTCA-9300 - Manual (Page 65)

65
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.