Intel® Core™ Ultra Processor

Datasheet, Volume 1 of 2
Supporting Intel® Core™ Ultra Processor for U/H/U-Type4-series Platforms, formerly known as Meteor Lake

ID Date Version Classification
792044 05/09/2025 Public
Document Table of Contents

Feature Overview

ITSS supports following features:

  • It houses the HPET, Legacy 8254 Timers and APIC Interrupt Controllers.
  • Fully synchronous-based design adopted for 8254 PIT.
  • Functions as a simple Internal Host Space Error Collector and Reporting Block.
  • 8254 PIT - Consists of 3 16-bit Timers capable of supporting up to 6 different modes.
  • APIC - Supports up to 120 IRQs.
  • HPET - Contains 8 Timer Blocks and a single always running 64-bit counter. Each Timer is interrupt capable, with option to route to APIC or directly to hose using MSI. Improved resolution, reduced overhead in comparison to Legacy 8254, IOxAPIC & RTC Timers.