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Tessent
®
Scan and ATPG User’s Manual
Software Version 2019.1
March 2019
Document Revision 12
© 1999-2019 Mentor Graphics Corporation
All rights reserved.
This document contains information that is proprietary to Mentor Graphics Corporation. The original recipient of this
document may duplicate this document in whole or in part for internal business purposes only, provided that this entire
notice appears in all copies. In duplicating any part of this document, the recipient agrees to make every reasonable
effort to prevent the unauthorized use and distribution of the proprietary information.
This document is for information and instruction purposes. Mentor Graphics reserves the right to make
changes in specifications and other information contained in this publication without prior notice, and the
reader should, in all cases, consult Mentor Graphics to determine whether any changes have been
made.
The terms and conditions governing the sale and licensing of Mentor Graphics products are set forth in
written agreements between Mentor Graphics and its customers. No representation or other affirmation
of fact contained in this publication shall be deemed to be a warranty or give rise to any liability of Mentor
Graphics whatsoever.
MENTOR GRAPHICS MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.
MENTOR GRAPHICS SHALL NOT BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR
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EVEN IF MENTOR GRAPHICS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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FAR 48 CFR 12.212 and DFARS 48 CFR 227.7202, use, duplication and disclosure by or for the U.S.
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®
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Tessent® Scan and ATPG User’s Manual, v2019.1
March 2019
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Revision History
Author: In-house procedures and working practices require multiple authors for documents. All
associated authors for each topic within this document are tracked within the Mentor Graphics
Technical Publication’s source. For specific topic authors, contact Mentor Graphics Technical
Publication department.
Revision History: Released documents maintain a revision history of up to four revisions. For
earlier revision history, refer to earlier releases of documentation which are available at the
following URL:
http://support.mentor.com
Revision Changes Status/
Date
12 Modifications to improve the readability and comprehension of
the content. Approved by Lucille Woo.
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
Released
Mar 2019
11 Modifications to improve the readability and comprehension of
the content. Approved by Lucille Woo.
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
Released
Dec 2018
10 Modifications to improve the readability and comprehension of
the content. Approved by Lucille Woo.
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
Released
Aug 2018
9 Modifications to improve the readability and comprehension of
the content. Approved by Lucille Woo.
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
Released
May 2018
Tessent® Scan and ATPG User’s Manual, v2019.1
4
March 2019
Note - Viewing PDF files within a web browser causes some links not to function. Use HTML for full navigation.
Tessent® Scan and ATPG User’s Manual, v2019.1
5
March 2019
Table of Contents
Revision History
Chapter 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
What is Design-for-Test?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DFT Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Top-Down Design Flow with DFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Chapter 2
Scan and ATPG Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Scan Design Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
About Scan Design Methodology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
About Wrapper Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Test Structure Insertion with Tessent Scan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
ATPG Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
The ATPG Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Random Pattern Test Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Deterministic Pattern Test Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
External Pattern Test Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Mentor Graphics ATPG Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Scan Sequential ATPG with the ATPG Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Overview of Test Types and Fault Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Test Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
IDDQ Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
At-Speed Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Fault Modeling Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Test Types and Associated Fault Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Fault Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Fault Collapsing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Supported Fault Model Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Fault Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Overview of Fault Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Fault Manipulation Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
About User-Defined Fault Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
User-Defined Fault Modeling Usage Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
UDFM File Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Creating a User-Defined Fault Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Generating UDFM Test Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Multiple Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Bridge Coverage Estimate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Embedded Multiple Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
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