ISO 26262: Hardware-Software Interface (HSI) Specification, Done Right

Date
2026-08-11
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on Hardware-Software Interface (HSI) Specification, Done Right (ISO 26262 — Automotive Functional Safety). What We'll Cover: What the HSI is and where Part 4 requires it between system design and HW/SW development The specification method step by step: resources, operating modes, timing constraints, diagnostics per signal How the HSI maps to Part 4 Clause 6 and refines into HW and SW safety requirements Common mistakes: HSIs that are register dumps with no safety-relevant timing or fault behavior The bidirectional trace between HSI entries and verification tests auditors follow Related topics: hardware software interface · hsi specification · iso 26262 part 4 · system design · register interface · operating modes · diagnostic features · timing constraints ·

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About Functional Safety Foundations

This online session delivers expert-led instruction on the regulatory landscape and implementation approach for Functional Safety Foundations.

The cross-sector fundamentals underlying every functional safety standard: risk as severity × likelihood, the safety function concept, integrity levels, the safety lifecycle, and the split between random and systematic failures.

What it regulates

Shared vocabulary and reasoning: hazard → risk → risk reduction allocation → safety requirement → verified implementation → maintained integrity in operation.

Who must comply

Everyone entering the field — the conceptual base of the entire catalog.

Key requirements of Functional Safety Foundations

  • Hazard and risk fundamentals
  • Safety function anatomy: sensor-logic-actuator with defined safe state
  • Integrity ladders (SIL/PL/ASIL/DAL) as risk-reduction currencies
  • Random vs systematic failure treatment
  • Lifecycle and management of functional safety incl. competence

Key concepts: Functional Safety Foundations

Random vs systematic
Hardware wear-out/chance failures quantified statistically versus design/process errors controlled by rigor.
Functional safety management
Planning, competence, documentation and assessment wrapped around technical work.
Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.
Safe state
The defined condition a function drives the equipment to on demand or fault.

Frequently asked questions: Functional Safety Foundations

Why can't testing alone prove safety?

Rare-event targets (like 1e-7/h) are unverifiable by test duration, and systematic errors evade random testing — hence the standards' dual machinery of quantified hardware analysis plus process rigor and independent assessment.

Standard information based on the published text of Functional Safety Foundations. Event content is provided by the host. For authoritative guidance, consult the official standard body.