Training

TetraMAX 2: DSMTest ATPG

Overview

This workshop discusses at-speed faults and how to use TetraMAX for at-speed test. Topics include description, recommendation, and scripts of transition, small-delay defect, and path-delay fault model ATPG. Also covered are the Onchip Clock Controller (OCC) flow, which leverages the PLL fast clocks, and using PrimeTime to generate the necessary data for at-speed test.

Hands-on labs follow each training module, allowing you to apply the skills learned in lecture. Labs include: using PrimeTime to generate the necessary files for at-speed ATPG; generating the patterns for different fault models in Tetramax; and, finally, using VCS for simulating the patterns generated.

Objectives

At the end of this workshop the student should be able to:

  • Describe the need for At-Speed testing
  • List the At-Speed fault models available
  • Describe the two launch techniques for at-speed faults
  • Successfully edit a stuck-at SPF file to suit at-speed fault model
  • Define the timing exceptions
  • Automate the process of script generation for TetraMAX, using PrimeTime. This script will take care of the false and multi-cycle paths
  • Modify a given stuck-at fault model script to run for an at-speed fault model
  • State the steps required to merge transition and stuck-at fault patterns to reduce the overall patterns
  • Automatically create scripts that can be used in PrimeTime to perform test mode STA
  • Describe the SDD flow
  • Describe the flow needed to successfully use the PLL present in your design to give the at-speed clock during capture modeState the steps needed to perform path-delay ATPG
  • Understand the fault classification in path-delay ATPG

Audience Profile

Engineers who use ATPG tools to generate patterns for different fault models.

Prerequisites

To benefit the most from the material presented in this workshop, you should:

A. Have taken the TetraMAX 1 workshop.

OR

B. Possess knowledge in the following areas:

  • Scan Architecture and ATPG
  • Stuck-At fault model ATPG with TetraMAX
  • SPF file

Course Outline

Module 1

  • Introduction of At-Speed defects
  • Source of Test Escapes and chip failure
  • Requirements for At-Speed testing
  • Popular fault models for At-Speed testing

Module 2

  • Transition Fault model
  • Path Delay Fault model
  • At-Speed Fault Detection Method
  • Techniques to Launch and Capture a Fault

Module 3

  • STIL file
  • Modifications to STIL file for At-Speed testing
  • Generic Capture Procedures

Module 4

  • Timing Exceptions
  • Automated Way to Generate Timing Exceptions form PrimeTime

Module 5

  • TetraMAX Scripts for Transition ATPG
  • Design Guidelines
  • Flow Considerations and Requirements
  • Pattern Merging
  • Automated way to generate the scripts for PrimeTime to perform testmode STA

Module 6

  • What is a Small Delay Defect ATPG
  • How to use PrimeTime to Generate the Slack Data
  • ATPG Flow in TetraMAX

Module 7

  • Requirement of PLL for At-speed faults
  • The various clocks in PLL flow
  • Use QuickSTIL to generate the SPF

Module 8

  • TetraMAX scripts for Path Delay ATPG
  • Fault Classification for Path Delay Faults
  • Generating Paths for TetraMAX Using PrimeTime
  • Reconvergence Paths
  • Hazard Simulation

Module 9

  • Conclusion
  • Topics Covered
  • Fault model and Features of TetraMAX
  • Solvnet Resources

Synopsys Tools Used

  • TetraMAX 2008.09
  • PrimeTime 2008.12
  • VCS 2008.12