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    The Verification Academy offers users multiple entry points to find the information they need. One of these entry points is through Topic collections. These topics are industry standards that all design and verification engineers should recognize. While we continue to add new topics, users are encourage to further refine collection information to meet their specific interests.

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Formal-Based Techniques

Formal-Based Techniques

This topic area focuses on formal-based techniques, ranging from formal property checking to formal coverage closure to sequential logic equivalence checking.

Featured On-Demand

Formal and the Next Normal

Formal and the Next Normal | Joe Hupcey - Subject Matter Expert

In this session, you will learn why formal verification is the key component to succeed in the era of Next Normal (agile and modular adoption), where first pass silicon success is crucial and ensuring quality across you verification cycle is essential.

Formal 101 - Fast, Scalable Formal Verification Made Easy

Formal 101: Fast, Scalable Formal Verification Made Easy | Subject Matter Expert - Joe Hupcey | DAC 2021

In this session, we will give an overview of how to apply basic abstractions, how to set up & optimize constraints, and where and how to leverage Data Independence & Non-Determinism.

Formal 101 – Data Independence and Non-Determinism Made Easy

Formal 101 – Data Independence and Non-Determinism Made Easy | Subject Matter Expert - Jin Hou | Siemens EDA 2021 Functional Verification Webinar Series

In this session, we will show how with a little design knowledge and forethought on your part, you can leverage these two principles to cut down your formal analysis to a matter of minutes vs. hours.

Formal 101 – Exhaustive Scoreboarding and Data Integrity Verification Made Easy

Formal 101 – Exhaustive Scoreboarding and Data Integrity Verification Made Easy | Subject Matter Expert - Mark Eslinger | Siemens EDA 2021 Functional Verification Webinar Series

In this session, we will show you how to use IEEE standard property checking code (SVA) and off-the-shelf formal tools to quickly and exhaustively verify data transport through the DUT matches the specification.

Formal-Based Techniques Courses

Sequential Logic Equivalence Checking

Sequential Logic Equivalence Checking Course | Subject Matter Expert - Jin Hou | Formal-Based Techniques Topic

In this course, you will be introduced to the concept of sequential logic equivalence checking and its common applications. You will also learn how to start with Questa® SLEC to verify design optimization, bug fix/ECOs, low power clock gating logic, and safety mechanisms.

Handling Inconclusive Assertions in Formal Verification

Subject Matter Expert - Jin Hou | Handling Inconclusive Assertions in Formal Verification Course

In this course, you will be introduced to techniques to help formal tools solve inconclusive assertions. You will also learn tool options to help convergence, introduce techniques for reducing assertion and design complexity.

Formal Coverage

Formal Coverage Course | Subject Matter Expert - Mark Eslinger | Formal-Based Techniques Topic

Formal coverage is a hot topic these days. Simulation has a number of metrics for helping determine when verification is done. These include code coverage, assertions coverage, transaction coverage, and functional coverage to name a few.

Getting Started with Formal-Based Technology

Getting Started with Formal-Based Technology Course | Subject Matter Expert - Harry Foster | Formal Based Techniques Topic

This course introduces basic concepts and terminology that should be useful by any engineer wishing to mature their formal-based technology skills.

Formal Assertion-Based Verification

Formal Assertion-Based Verification Course | Subject Matter Expert - Mark Eslinger | Formal Based Techniques Topic

In this course the instructors will show how to get started with direct property checking.

Formal-Based Technology: Automatic Formal Solutions

Formal-Based Technology: Automatic Formal Solutions Course | Subject Matter Expert - Mark Eslinger | Formal Based Techniques Topic

After a brief introductory session outlining the general architecture of formal apps, in each subsequent session of the course will deep dive on a specific verification challenge and the corresponding formal application.

Questa® Formal Verification Resources

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  • Articles
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Industry Articles

  • Formal Verification Ensures The Perseverance Rover Lands Safely On Mars
  • Do You Know For Sure Your RISC-V RTL Doesn’t Contain Any Surprises?

DVCon US 2021

  • Formal Verification Experiences: Spiral Refinement Methodology for Silicon Bug Hunt
  • “Bounded Proof” Sign-Off with Formal Coverage

Improving Quality and Time-to-Market with Formal

  • Part 2: Direct Formal Property Checking
  • Part 1: Automated Formal-Based Apps

DVCon US 2020

  • Deadlock Verification For Dummies – The Easy Way Using SVA and Formal

What Is Formal, And How It Works Under-the-Hood

  • What is Formal, Anyway?
  • Instant Formal Expert

Success Stories

  • How Microsemi Uses Questa Formal Connectivity Check to Improve Quality and Productivity
  • Cypress Adopts Questa Formal Apps to Create Pristine IP

Formal Verification Seminar - Download the Session Slides!

  • Formal Verification Tips for Success
  • Formal Verification: Automation and Tips for Success

Press Release

  • Mentor Graphics Expands Formal Verification's Reach with New Cross-Platform GUI and Apps for Sequential Logic Equivalence Checking and CDC Gate-Level Analysis

Stuck on a Desert Island without Simulation – Only Formal!

  • How Do I Verify My Rescue Drone's RTL
  • An Exhaustive 1-2 Punch for RTL Signoff
  • Select and Run Automated Formal Apps
  • Setup a Formal Testbench
  • Use Formal to Check Logic Faults
  • Close the Verification Loop

Microsoft Xbox® Formal Success

  • How the X-Box Program Has Adopted Formal

ARM® Techcon Paper Report

  • Advanced Verification Management and Coverage Closure Techniques
  • How Microsoft Saved 4 Man-Months Meeting Their Coverage Closure Goals Using Automated Verification Management & Formal Apps
  • ARM® Techcon 2014 Proceedings

Featured Formal-Based Techniques Verification Horizons Articles

  • Back to the Future with Formal Property Checking
  • Technologist Interview: What Siemens’ Acquisition of OneSpin Means for Formal Verification – and You
  • Formal Etiquette for Code Coverage Closure
  • A Formal Verification Technique for Complex Arithmetic Hardware
  • Predictable and Scalable End-to-End Formal Verification
  • Formal Is The “New Normal” - Deploy These FV Apps In Your Next Project
  • Using Questa® SLEC to Speed Up Verification of Multiple HDL Outputs
  • Formal Verification of RISC-V® Processors
  • Don’t Forget the Protocol! A CDC Protocol Methodology to Avoid Bugs in Silicon
  • Formal Bug Hunting with “River Fishing” Techniques
  • Ten Rules to Successfully Deploy Formal
  • Formal Apps Take the Bias Out of Functional Verification
  • It’s Not My Fault! How to Run a Better Fault Campaign Using Formal
  • RTL Glitch Verification
  • Debugging Inconclusive Assertions and a Case Study
  • Formal Verification: Not Just for Control Paths
  • How Formal Techniques Can Keep Hackers from Driving You into a Ditch
  • Minimizing Constraints to Debug Vacuous Proofs
  • Evolving the Use of Formal Model Checking in SoC Design Verification
  • Functional Coverage Development Tips: Do's and Don'ts
  • Formal and Assertion-Based Verification of MBIST MCPs
  • Starting Formal Right from Formal Test Planning
  • Life Isn't Fair, So Use Formal
  • Confidence in the Face of the Unknown: X-state Verification
  • Using Formal Analysis to "Block and Tackle"
  • The Formal Verification of Design Constraints
  • The Top Five Formal Verification Applications

Industry Formal-Based Techniques Articles

  • The pitfalls of mixing formal and simulation: Examples of the trouble
  • Formal Verification Ensures The Perseverance Rover Lands Safely On Mars
  • Do You Know For Sure Your RISC-V RTL Doesn’t Contain Any Surprises?
  • Spiral in on silicon bugs in six formal steps
  • Three Steps To Complete Reset Behavior Verification

Featured Formal-Based Techniques White Papers

  • Are you safe yet? Safety mechanism insertion and validation
  • Understanding formal verification methods for use in DO-254 programs
  • Comparing formal and simulation code coverage
  • Formal verification for DO-254 and other safety-critical designs
  • How to avoid the pitfalls of mixing formal and simulation coverage
  • Using Formal Verification to Check SoC Connectivity Correctness
  • Formal Verification Experiences
  • It’s Not My Fault! How to Run a Better Fault Campaign Using Formal
  • Formal Apps Take the Bias Out of Functional Verification
  • Reset Verification in SoC Designs
  • Formal Techniques for Optimizing ISO 26262 Fault Analysis
  • Efficient and Exhaustive Floating Point Verification Using Sequential Equivalence Checking
  • Register Verification: Do We Have Reliable Specification?
  • Is Your Power Aware Design Really X-Aware?

Questa® PropCheck

  • Overview
  • Cone of Influence
  • Debug a Firing
  • Properties Tab
  • Property Editor
  • Run Monitor/Details
  • Schematic
  • Source Window
  • Waveform View
  • Run Formal

Questa® AutoCheck

  • Design Checks, Source & FSM Debug

Questa® Connectivity Check

  • Assertions & Waveforms

Questa® CoverCheck

  • Details, Coverage Checks & Source Debug

Questa® Register Check

  • Memory Mapped Register Checkers

Questa® SecureCheck

  • Properties Tab, Waveform & Schematic Views

Questa® X-Check

  • Find X Corruption Views

Featured Formal-Based Techniques On-Demand Technical Sessions

  • Formal and the Next Normal
  • Formal 101 – Fast, Scalable Formal Verification Made Easy
  • Overcoming Today’s Verification, Supply Chain, and Legacy Technology Challenges Associated with FPGA-based Designs
  • Practical Flows for Continuous Integration: Making The Most of Your EDA Tools
  • Formal 101 – Data Independence and Non-Determinism Made Easy
  • Formal 101 – Exhaustive Scoreboarding and Data Integrity Verification Made Easy
  • IP Security: Keys to Early Identification of Security Vulnerabilities
  • Equivalence Checking for FPGA
  • Formal 101 – Setting Up & Optimizing Constraints
  • Formal 101 – Basic Abstraction Techniques
  • Automatic Formal Verification - Questa Static and Formal Apps
  • How to Exhaustively Verify Register I/O Policies Without Exhausting Yourself
  • The ABC of Formal Verification
  • I'm Excited About Formal...My Journey From Skeptic To Believer
  • Reducing Area and Power Consumption while Increasing Performance with Formal-based ‘X’
  • Part 2: Direct Formal Property Checking - Improving Quality and Time-to-Market with Formal
  • Part 1: Automated Formal-Based Apps - Improving Quality and Time-to-Market with Formal
  • Should I Kill My Formal Run? Part 1: What You Can Do While the Formal Run is In-Progress
  • Should I Kill My Formal Run? Part 2: What You Can Do Beforehand to Avoid Trouble and Set Yourself Up for Success
  • How to Unearth Deep Bugs Faster and Cheaper Using Formal Bug Hunting Techniques
  • How to Shorten Your Schedule with Interactive Formal Debug and Design Exploration
  • New School Connectivity Checking
  • New School Coverage Closure
  • Improving Quality and Time-to-Market with Formal Verification

Featured Formal-Based Techniques Seminars

  • Should I Kill My Formal Run - Parts 1&2
  • What Is Formal, And How It Works Under-the-Hood
  • Formal Verification Tips for Success
  • Stuck on a Desert Island without Simulation – Only Formal!
  • New School Formal Verification

Featured Formal-Based Techniques Blog Posts

  • Osmosis – our annual event for formal verification users – is back F2F this December 8, 2022!
  • DAC 2022: The Digital Twin Reimagined – One Model To Rule Them All?
  • DAC 2022: Siemens EDA Experts Share Practical Cloud Solutions
  • Pro Tip: Planning to Land Your Spacecraft on Mars? You Will Need CDC, RDC, and Formal Property Checking
  • Preview of DVCon 2022 — How to Avoid the Pitfalls of Mixing Formal and Simulation Coverage
  • FPGA Retargeting
  • Part 6, FPGA-focused Equivalency Checking Flows
  • How Can You Say That Formal Verification Is Exhaustive?
  • Learn Formal the Easy Way
  • DVCon USA 2021 Best Paper Report – Formal Verification Experiences: Spiral Refinement Methodology for Silicon Bug Hunt
  • Formal Level 6: Property-Driven Development
  • Reducing Area and Power Consumption while Increasing Performance with Formal-based ‘X’ Verification
  • Your First Step Into Formal Property Checking
  • I’m Excited About Formal Property Checking! My Journey From Skeptic to Believer
  • Part 5, Summary of the Most Popular LEC and SLEC Use Cases
  • Part 4, How SLEC Brings Automated, Exhaustive Formal Analysis to Safety Mechanism Verification
  • Part 3, How SLEC Brings Automated, Exhaustive Formal Analysis to Low Power Clock Gating Verification
  • FMCAD 2019: The Most Important Formal Verification Conference You’ve Never Heard Of
  • Part 2, How SLEC Brings Automated, Exhaustive Formal Analysis to ECO/Bug Fix Verification
  • Part 1, Synthesis Validation with LEC and SLEC
  • Leveraging Data Independence and Non-Determinism - Part 6
  • Memory Abstraction - Part 5
  • Counter Abstraction - Part 4
  • Assertion Decomposition - Part 3
  • Reducing the Complexity of Your Assumptions - Part 2
  • Finding Where Formal Got Stuck and Some Initial Corrective Steps to Take - Part 1
  • Significantly Improve Your FPGA Design Reliability by Using Custom CDC Synchronizers
  • OVL: The Free, Open Assertion Library You Can Use To Jump Start Your Formal Testbench
  • No One Expects Gate Level CDC Verification and Glitch Detection for ASIC Signoff!
  • Formal Tech Tip: What are Vacuous Proofs, Why They Are Bad, and How to Fix Them
  • How to Become a Formal Expert and Impress your Friends and Boss!
  • How to Save a Ton of Time and Energy by Prioritizing Faults with Exhaustive Formal Analysis Before Launching Detailed Fault Verification
  • DVCon China: Formal Technology Is Set for Growth in Asia
  • How To Connect Your Testbench to Your Low Power UPF Models
  • How Formal Techniques Can Keep Hackers from Leaving You in the Cold
  • 3 Things About UPF 3.0 You Need to Know Now
  • How to Avoid Metastability on Reset Signal Networks, a/k/a Reset Check is the New CDC
  • 5 Things I Learned at the 2016 SAE World Congress
  • DVCon USA 2016: Heralding Formal's New Wave
  • Goal posts Aren't Only for Football – Use Them in Formal Analysis Too!
  • Are You Struggling to Reach Timing Closure with Your Low Power Design – You May Have CDC Problems!
  • Formal Tech Tip: How Good Properties Can be Over-constrained and How to Fix It
  • Back to School: How to Educate Yourself and Your Colleagues About Formal and CDC Verification
  • How Formal Techniques Can Keep Hackers from Driving You into a Ditch (Part 2 of 2)
  • How Formal Techniques Can Keep Hackers from Driving You into a Ditch (Part 1 of 2)

Exhaustive, Automated Solutions for Complex Verification Challenges

Questa® formal-based technologies offer a broad spectrum of formal solutions and applications which complement simulation in a number of key areas. Questa Formal Verification Apps boost verification efficiency and design quality by exhaustively addressing verification tasks which are difficult to complete with traditional methods, yet don’t require formal or assertion-based verification experience.

Learn more.

Datasheets
  • Questa® Formal Applications Fact Sheet
  • Questa® SLEC Fact Sheet

Formal Verification Sessions

Overcoming Today’s Verification, Supply Chain, and Legacy Technology Challenges Associated with FPGA-based Designs

Overcoming Today’s Verification, Supply Chain, and Legacy Technology Challenges Associated with FPGA-based Designs | Subject Matter Expert - Martin Row | Siemens EDA Functional Verification Webinar Series

In this session you will gain an understanding of the core challenges facing designers of FPGA-based devices. Everything from ensuring the functionality to dealing with FPGA supply chain issues to extending the life of legacy designs powered by old or obsolete FPGAs.

Formal 101 - Fast, Scalable Formal Verification Made Easy

Formal 101: Fast, Scalable Formal Verification Made Easy | Subject Matter Expert - Joe Hupcey | DAC 2021

In this session, we will give an overview of how to apply basic abstractions, how to set up & optimize constraints, and where and how to leverage Data Independence & Non-Determinism.

Formal 101 – Basic Abstraction Techniques

Formal 101 – Basic Abstraction Techniques | Subject Matter Expert - Jin Hou | Siemens EDA 2021 Functional Verification Webinar Series

In this session we will teach about the types of DUT constructs that commonly cause trouble for the formal analysis, and how to apply time-tested techniques to safely abstract them away so that the formal verification run can rapidly reach closure.

Formal 101 – Data Independence and Non-Determinism Made Easy

Formal 101 – Data Independence and Non-Determinism Made Easy | Subject Matter Expert - Jin Hou | Siemens EDA 2021 Functional Verification Webinar Series

In this session, we will show how with a little design knowledge and forethought on your part, you can leverage these two principles to cut down your formal analysis to a matter of minutes vs. hours.

Formal 101 – Exhaustive Scoreboarding and Data Integrity Verification Made Easy

Formal 101 – Exhaustive Scoreboarding and Data Integrity Verification Made Easy | Subject Matter Expert - Mark Eslinger | Siemens EDA 2021 Functional Verification Webinar Series

In this session, we will show you how to use IEEE standard property checking code (SVA) and off-the-shelf formal tools to quickly and exhaustively verify data transport through the DUT matches the specification.

Formal 101 – Setting Up & Optimizing Constraints

Formal 101 – Basic Abstraction Techniques | Subject Matter Expert - Mark Eslinger | Siemens EDA 2021 Functional Verification Webinar Series

In this session we will show you how to write optimal constraints for formal analysis; and how to deliberately under- and over-constrain the analysis to learn more about the effectiveness of the constraints themselves, your test plan and formal coverage plan, and the DUT behavior.

Should I Kill My Formal Run? Part 1: Formal Run is In-Progress

Should I Kill My Formal Run? Part 1: Formal Run is In-Progress Session | Subject Matter Expert - Dr. Jeremy Levitt | Academy Live Web Seminar

In this session we will show you the information you can use to decide whether to continue or stop the formal job such as how to monitor the formal engines’ “health” in real time and why a given property analysis might be getting stuck.

Should I Kill My Formal Run? Part 2: Avoid Trouble and Set Yourself Up For Success

Should I Kill My Formal Run - Part 2: What You Can Do Beforehand to Avoid Trouble and Set Yourself Up for Success Session | Subject Matter Expert - Mark Eslinger | Academy Live Web Seminar

In this session we assume you are about to kick off a formal analysis, and want to make sure you will avoid the most obvious pitfalls in setting up your formal testbench, the DUT, and the runner scripting.

How to Exhaustively Verify Register I/O Policies Without Exhausting Yourself

How to Exhaustively Verify Register I/O Policies Without Exhausting Yourself | Subject Matter Expert - Joon Hong | Academy Live Web Seminar

In this session, we will show how to employ an automated, formal-based flow to ensure complete coverage of your registers’ state space – without having to learn formal at all. The benefits of this approach are two-fold: you can exhaustively verify the specified behaviors and the complete absence of any illegal behaviors.

I'm Excited About Formal...My Journey From Skeptic To Believer

I'm Excited About Formal... My Journey From Skeptic To Believer Session | Neil Johnson - Subject Matter Expert

This web seminar documents an unlikely journey into formal for a verification engineer who’s spent an entire career using simulation.

Practical Flows for Continuous Integration: Making The Most of Your EDA Tools

Practical Flows for Continuous Integration: Making The Most of Your EDA Tools | Subject Matter Expert - Neil Johnson | Siemens EDA 2021 Functional Verification Webinar Series

In this session, we’ll teach you how to use a collection of tools – both formal and simulation – as part of a comprehensive approach to verifying RTL and testbench changes before releasing them to your team.

Automatic Formal Verification - Questa Static and Formal Apps

Automatic Formal Verification - Questa Static and Formal Apps | Subject Matter Expert - Walter Gude | Academy Live Web Seminar

In this session, you will gain an understanding of the automatic formal applications that can be used to solve current design and verification challenges.

Reducing Area & Power Consumption with Formal-based ‘X’ Verification

Reducing Area and Power Consumption while Increasing Performance with Formal-based ‘X’ Verification Session | Ping Yeung - Subject Matter Expert

In this session we will share a comprehensive static and formal-based methodology employing this app that enables design teams to root cause ‘X’ issues early in the RTL design process.

Direct Formal Property Checking - Improving Quality and Time-to-Market with Formal

Direct Formal Property Checking - Improving Quality and Time-to-Market with Formal Session | Subject Matter Expert - Mark Eslinger | What’s New in Functional Verification from Mentor Web Seminar

In this session, you will learn how formal analysis works, and you can create an effective "formal testbench" with very basic, easy-to-write properties.

Automated Formal-Based Apps - Improving Quality and Time-to-Market with Formal

Automated Formal-Based Apps - Improving Quality and Time-to-Market with Formal Session | Subject Matter Expert - Joe Hupcey | What’s New in Functional Verification from Mentor Web Seminar

In this session, you will learn how formal apps can help you address high-value verification challenges; finding deep bugs in complex logic, accelerating code coverage closure, validating low power clock gating and more.

How to Unearth Deep Bugs Faster and Cheaper Using Formal Bug Hunting Techniques

How to Unearth Deep Bugs Faster and Cheaper Using Formal Bug Hunting Techniques Session | Subject Matter Expert - Mark Eslinger | Academy Live Web Seminar

In this session, you will learn how to leverage formal analysis to find and fix as many functional bugs as possible, ultimately improving the quality of your end-product, and lowering the risk of re-spins.

How to Shorten Your Schedule with Interactive Formal Debug and Design Exploration

How to Shorten Your Schedule with Interactive Formal Debug and Design Exploration Session | Subject Matter Expert - Mark Eslinger | Academy Live Web Seminar

In this session, you will learn how to shorten your formal debug time and how using formal to explore design functionality.

New School Connectivity Checking

New School Connectivity Checking Session | Subject Matter Expert - Mark Eslinger | Verification Academy Technology Web Seminar Series

This session discusses the use of a new school formal verification method which can be easily applied to solve the problem of connectivity checking with detailed case studies of how this formal app was used to automatically verify connectivity and accelerate the debug process.

New School Coverage Closure

New School Coverage Closure Session | Subject Matter Expert - Mark Eslinger | Verification Academy Live Seminar

In this session, you will learn a new school formal verification method which automates the job of focusing coverage closure efforts.

Equivalence Checking for FPGA

Equivalence Checking for FPGA | Subject Matter Expert - Martin Rowe | Siemens EDA 2021 Functional Verification Webinar Series

In this session, you will learn the need and methodologies to apply Equivalence Checking for FPGAs, plus the advantages and challenges of stepwise netlist verification.

IP Security: Keys to Early Identification of Security Vulnerabilities

IP Security: Keys to Early Identification of Security Vulnerabilities | John Hallman - Subject Matter Expert

In this session we will demonstrate early security verification on a small module of intellectual property (IP) intended for integration into an IC. Using Methodics IPLM by Perforce’s key technology for IP management and OneSpin 360™ formal verification tools, our technical experts will jointly perform the process recently released for public comment in the Accellera Secure Annotation for Electronic Design Integration (SA-EDI) Standard.

The ABC of Formal Verification

The ABC of Formal Verification Session | Dr. Ashish Darbari - Axiomise

This tutorial webinar covers formal methodology in detail focusing on the ABCs of formal: (A) abstraction, (B) bug hunting & building proofs, and (C) coverage in the context of property checking.

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