STILVerify User’s Manual

Software Version 2018.3

August 2018

Document Revision 10

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 Revision History

Revision Changes Status/

Date
10 Modifications to improve the readability and comprehension of Released
the content. Approved by Lucille Woo. Aug 2018
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
9 Modifications to improve the readability and comprehension of Released
the content. Approved by Lucille Woo. May 2018
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
8 Modifications to improve the readability and comprehension of Released
the content. Approved by Lucille Woo. Mar 2018
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.
7 Modifications to improve the readability and comprehension of Released
the content. Approved by Lucille Woo. Dec 2017
All technical enhancements, changes, and fixes listed in the
Tessent Release Notes for this product are reflected in this
document. Approved by Ron Press.

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

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4 STILVerify User’s Manual, v2018.3
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 Table of Contents

Revision History

Chapter 1
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STIL Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STIL Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STILVerify Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using STILVerify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
STILVerify Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
stilverify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Appendix A
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
The Tessent Documentation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mentor Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Index
Third-Party Information
End-User License Agreement

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 Table of Contents

6 STILVerify User’s Manual, v2018.3

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 List of Figures

Figure 1-1. STIL Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 1-2. Block Diagram of 8-Bit Bus Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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 List of Figures

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 Chapter 1
Getting Started

STILVerify is a free verification utility provided by Mentor Graphics for checking the
conformity of Standard Test Interface Language (STIL) files.
This tool enables developers of Electronic Design Automation (EDA), Automated Test
Equipment (ATE), and related tools to ensure compatibility with STIL-based flows. STILVerify
ensures that STIL files are syntactically correct, and it also features a Verilog test bench that
allows EDA and ATE tool developers to run and display STIL content in any Verilog simulator
in order to verify the content and behavior of STIL code. This feature also allows test engineers
to define STIL-based flows more easily, enabling faster initial ramp up of STIL-based test
processes. STILVerify reduces the time, effort, and expense required for semiconductor
manufacturers to ramp up their STIL-based flows

For the complete list of Mentor Graphics Tessent-specific terms, refer to the “Tessent
Glossary”.

STILVerify is available for download at the following URL:

https://www.mentor.com/products/silicon-yield/

STIL Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STIL Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STILVerify Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using STILVerify. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
STILVerify Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
stilverify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

STIL Language
STIL is an industry standard, IEEE-approved language providing an interface between digital
test generation and ATE tools; and also provides data exchange between EDA point tools from
different vendors. STIL is designed to transfer high density digital test patterns and waveforms
between simulation, Automatic Test Pattern Generation (ATPG), integral test techniques such
as Built-In-Self-Test (BIST), and ATE tools. STIL can be used to represent test patterns for both
simple and complex devices.
Established by the IEEE in 1999 (the IEEE 1450 Standard), STIL is a test data description
language designed to provide an unambiguous and complete standard data interface between
EDA software and ATE interfaces, thereby simplifying semiconductor test flow. STIL is an

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Getting Started
STIL Standard

open source language due to the requirement for the language to provide transportability from
design contexts (EDA) to the test environment (ATE).

Converting EDA test patterns to proprietary ATE test languages is time consuming using
manual translation methods. With a STIL based flow, test patterns can be generated for the ATE
in less time, with less a likelihood for errors being generated during language translation. Note
that STIL programs are representations of information needed to define digital test operations in
manufacturing tests, and are not intended to define how the tester implements that
information.STIL facilitates the transfer of digital test pattern data from EDA to ATE
environments by supporting the volume of digital test pattern data generated by ATPG and
BIST tools, in a format optimized for application in ATE environments. The language allows
for the specification of pattern, format, and timing information for defining the application of
digital test patterns to a device to be tested. The result is a decrease in the time and expense of
test program development, and an increase in the efficiency of running design-specific tests on
target ATE machines.

STIL Standard
The emerging IEEE 1450 STIL standard includes several extensions to handle semiconductor
design environments, DC-level specification, tester target and flows, test methods, and
semiconductor cores. Some extensions have been adopted; others are in varying stages of
development. In this document, when STIL is mentioned without a version number, it refers to
the original STIL effort (now known as IEEE Std. 1450.0-1999), which defines the standard
data format used to convey test pattern and timing information from ATPG tools to ATE test
software generation tools.
The versions of the STIL Standard are as follows:

• 1450.0-1999 — Basic STIL for digital test patterns. This standard was approved by the
IEEE in 1999 and is now known as IEEE Std. 1450.0-1999. As additional test areas
were identified, follow-on extensions were defined. These are documented in the
following items.

• 1450.1 — Extension to STIL for semiconductor design environments. This extension

supports EDA-specific application of STIL data, test development, and test refinement
processes.

• 1450.2-2002 — Extension to STIL for DC-level specification. This extension defines

structures in STIL for specifying the dc conditions for a device under test. These
conditions may be specified globally or by pattern burst, pattern, or vector. This
standard was approved by the IEEE in 2002 and is now known as IEEE Std. 1450.2-
2002.

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 Getting Started
STILVerify Overview

• 1450.3 — Extension to STIL for tester resource constraints. This extension defines
mechanisms for identifying constraints on STIL constructs in particular test
environments.

• 1450.4 — Extension to STIL for test flow specification. This extension defines test
organization, control, sequencing, and error processing.

• 1450.5 — Extension to STIL for semiconductor test method specification. This

extension defines constructs for performing specific test operations.

• 1450.6 — Extension to STIL for Core Test Language (CTL) support. As part of the
STIL standard, the IEEE created CTL, which is a standard description language that
gives designers a standard approach for describing DFT structures in core-based
System-on-chip (SoC) designs when generating automatic test programs.

• 1450.AMS — Extension to STIL for analog and mixed signal circuits or designs.
For more information on the STIL format, refer to IEEE Standard Test Interface Language
(STIL) for Digital Test Vector Data, IEEE Std. 1450-1999.

STILVerify Overview
The STILVerify utility is used to parse STIL files from any tool and report warnings and errors
for any problems found. It can also be used to create a standalone Verilog test bench in order to
check the functionality of the STIL pattern data. STILVerify is a standalone command line
utility with no GUI and no license requirements. The tool has the ability to create either serial or
parallel Verilog test benches for all STIL pattern files.
Note
The STILVerify tool does not alter the original STIL file when it verifies its syntax.

The STILVerify utility contains an option to set a STIL compliance level in order to generate
warnings if the STIL file uses STIL syntax that is not supported in the STIL “dot” extension
specified. The STILVerify utility supports the following:

• Full support and checking for IEEE STIL 1450.0.

• Partial compliance for IEEE 1450.1, in that STILVerify can read “common” scan
structures and generate parallel test benches.
• Full compliance for IEEE STIL 1450.2.
• Partial support for IEEE 1450.6.
The following figure shows how STILVerify fits into the data flow between CAE and ATE
environments. STIL represents patterns as a series of cyclized waveforms that are executed
sequentially. The waveform representation can be simple or a complex set of parameterized

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Getting Started
STILVerify Overview

events, so you might need tools to manipulate the STIL data according to the requirements of
the ATE device, though the output of that manipulation will still be represented in STIL.

Figure 1-1. STIL Data Flow

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 Getting Started
Using STILVerify

Using STILVerify
This is a brief guide to usage of STILVerify with introductory exercises you can run. You can
use it to become familiar you with the operation of the STILVerify tool. This section does not
provide full details for running the tool, but rather, contains enough information to help you get
started.
In order to use the STILVerify utility, you need source for your STIL patterns, such as a tool, or
the ability to create them manually. See stilverify for a description of all STILVerify command
arguments.

STILVerify Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
stilverify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

STILVerify Procedure
The STILVerify procedure consists of running the stilverify command with a STIL program
which includes STIL test pattern data.
This description for STILVerify uses a 74245 8-bit tri-state non-inverting bus transceiver,
shown in Figure 1-2. Enable and direction pins control output enables. The circuit has been
simplified for this example so that bus signals are unidirectional.

Figure 1-2. Block Diagram of 8-Bit Bus Transceiver

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Getting Started
STILVerify Procedure

Prerequisites
• A complete STIL program. For example, this file, stest.stil, represents a complete STIL
program to exercise an 8-bit bus transceiver:
// STIL example of an 8-bit bus transceiver
STIL 1.0;
// The Header block specifies data about the STIL file.
Header {
Title "example stil file -- stest.stil";
Date "Fri Jan 12 11:33:54 2006";
Source "Simplified 74245";
History { Ann {* rev 1 -- original version *}}
}
// The Signals block defines individual signal names used
// in the design.
Signals {
G_ In; DIR In;
A0 In; A1 In; A2 In; A3 In; A4 In; A5 In; A6 In; A7 In;
B0 Out; B1 Out; B2 Out; B3 Out; B4 Out; B5 Out; B6 Out; B7 Out;
}
// The SignalGroups block defines named references to signals.
SignalGroups {
A = ’A7 + A6 + A5 + A4 + A3 + A2 + A1 + A0’;
B = ’B7 + B6 + B5 + B4 + B3 + B2 + B1 + B0’;
BUSES = ’DIR + G_ + A + B’;
}
// The Timing block defines a sequence of repeated waveforms
// to execute test programs.
Timing normal {
WaveformTable defaults {
Period ’500ns’;
Waveforms {
DIR { 01 { ’0ns’ D/U; } }
G_ { 01 { ’0ns’ U; ’200ns’ D/U; ’300ns’ U; } }
A { 01 { ’10ns’ D/U; } }
B { HLZ { ’0ns’ Z;’0ns’ X; ’260ns’ h/l/t; ’280ns’ X; } }
}
}
}
// The PatternBurst block defines pattern names to be executed.
PatternBurst all_pats { PatList { Pat1; } }

// The PatternExec block defines how Timing and PatternBurst

// information is assembled to create the tests to execute.
PatternExec run_all {
Timing normal;
PatternBurst all_pats;
}

// The Include statement defines a file reference.

Include "pat1.stil";

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 Getting Started
STILVerify Procedure

• A file containing the STIL test pattern data. For example this test pattern data file,
pat1.stil:
// STIL test pattern data

// The Pattern block defines the operation of the test, by repeated

// application of waveforms for each signal.
Pattern Pat1 {
WaveformTable defaults;
Vector { BUSES = 0000000000LLLLLLLL; }
Vector { BUSES = 0010000000HLLLLLLL; }
Vector { BUSES = 0001000000LHLLLLLL; }
Vector { BUSES = 0000100000LLHLLLLL; }
Vector { BUSES = 0000010000LLLHLLLL; }
Vector { BUSES = 0000001000LLLLHLLL; }
Vector { BUSES = 0000000100LLLLLHLL; }
Vector { BUSES = 0000000010LLLLLLHL; }
Vector { BUSES = 0000000001LLLLLLLH; }
}

Procedure
1. Enter the stilverify command at the shell command prompt to invoke STILVerify. For
example, the following command will parse the file stest.stil, and create a test bench
btest.v with “btransceiver” as the top-level module name for this particular design.
stilverify stest.stil -verilog btest.v -serial \
-module btransceiver -log test.log -replace

2. After the tool finishes and exits, you may review the command results. In this case, the
transcript was saved in the logfile named test.log. The logfile contains a copy of the
command you executed, as well as the results of executing the command. In this case,
you see the message “No errors found in STIL file” indicating there are no syntax errors
in the STIL file:
stilverify stest.stil -verilog btest.v -serial -module btransceiver
\ -log test.log -replace
// Reading STIL input file "stest.stil"
// Finished parsing STIL input file "stest.stil"
// No errors found in STIL file.
// Creating Verilog test bench "btest.v"

3. Once you are sure the syntax in the STIL patterns is correct, you can use a digital
simulator such as ModelSim® to run a simulation on the Verilog test bench that
STILVerify generated to ensure that the content of the patterns is what you expected.
To be able to run the test bench, you need to have an RTL or gate-level Verilog
description of the design as well as Verilog simulation libraries. If there are simulation
mismatches, they will be transcribed to the output. Simulation mismatches indicate that
your STIL patterns do not appear to match the design, and you will need to determine
why.

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Getting Started
STILVerify Procedure

A typical ModelSim run of the STIL Verify test bench looks like this:
vlog btest.v

Model Technology ModelSim SE vlog 5.8a compiler 2003.12 Dec 19 2003

-- Compiling module btransceiver_btest_v_ctl

Top-level modules:
btransceiver_btest_v_ctl

vsim +notimingchecks -c btransceiver_btest_v_ctl

# // ModelSim SE 5.8a Dec 01 2003 SunOS 5.8
# //
# // Copyright Model Technology, a Mentor Graphics Corp. company,
2003
# // All Rights Reserved
# // UNPUBLISHED, LICENSED SOFTER.
# // CONFIDENTIAL AND PROPRIETARY INFORMATION WHICH IS THE
# // PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS.
# //
# Loading work.btransceiver_btest_v_ctl
# Loading work.btransceiver

... Loading statements and warnings about design being simulated ...

VSIM 1> run -all

# Loading btest.v.0.vec
#
# No error between simulated and expected patterns
#
# ** Note: $finish : ./btest.v(190)

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 Getting Started
stilverify

stilverify
Verifies the correctness of STIL generated and used by ATE and EDA tools.
Usage
stilverify stil_pathname
[-EXtension number [-EXtension number ...]]
[-VErilog test_file]
[-SErial]
[-MOdule module_name]
[-PARAMeter file_name]
[-VERBose]
[-LOgfile logfile [-REplace]]
[-Help]
[-Usage]
[-VERSion]
Arguments
• stil_pathname
A required string pair that specifies the input STIL pattern file to check.
• -EXtension number
An optional switch and string pair that specifies a STIL dot extension to use for compliance
checking (0 through 6). If specified, any STIL syntax found in the file that comes from
extensions not specified will produce a warning. If not specified, all supported STIL levels
are accepted without warning.This switch allows multiple values for number and multiple -
Extension switches; therefore, to specify both STIL 1450.1 and 1450.2, either of the
following is acceptable:
o -ex 1 2
o -ex 1 -ex 2

Note
Entering “-ex 0” is not necessary, as STIL 1450.0 is the basis for all other
extensions, and it is impossible to not use the syntax in 1450.0.

• -VErilog test_file
An optional switch and string pair that specifies that a Verilog test bench should be written.
If this argument is not specified, no test bench will be produced.
• -SErial
Optional switch that specifies whether to produce a serial scan load Verilog test bench. This
is the default.

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Getting Started
stilverify

• -MOdule module_name
An optional switch and string pair that specifies the Verilog module name to use for the
design being instantiated in the test bench. If not specified, the tool will attempt to create the
module name from information in the STIL file.
Note
You can find the top-level module name from your design netlist.

• -PARAMeter file_name
An optional switch and string pair that specifies to load a parameter file which is used when
writing a Verilog test bench if the -VErilog switch is used. All Verilog-related parameter
file keywords from the ATPG tools are supported in this parameter file.
• -VErbose
An optional switch that prints more detailed warning messages concerned with STIL
practices that are not recommended. The STIL code that will result in these warnings is still
technically legal.
• -LOgfile logfile
An optional switch and string pair that specifies the logfile to write.
• -REplace
An optional switch that specifies to replace the logfile if it already exists.
• -Help
An optional switch that displays a message that contains all the STILVerify switches and a
brief description of each.
• -Usage
An optional switch that displays the usage syntax for the STILVerify command.
• -Version
An optional switch that displays the version of the STILVerify tool that you currently have
available.
Description
Verifies the correctness of STIL files generated by any tool and reports warnings and errors for
any problems found. The tool can also be used to create a standalone, serial or parallel Verilog
test bench, in order to check the functionality of the STIL pattern data.

The STILVerify command is entered on the command line in lowercase, as in “stilverify”. The
uppercase characters on the arguments represent minimal parameter representation. Also, do not
enter the square braces ([ ]) when typing the command. Use of brackets means that the argument
is optional.

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 Getting Started
stilverify

Examples
This command will parse the file stest.stil, and create a test bench btest.v with “btransceiver” as
the top-level module name for this particular design.

stilverify stest.stil -verilog btest.v -serial -module btransceiver -log test.log -replace

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Getting Started
stilverify

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 Appendix A
Getting Help

There are several ways to get help when setting up and using Tessent software tools. Depending
on your need, help is available from documentation, online command help, and Mentor
Graphics Support.
The Tessent Documentation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mentor Support Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

The Tessent Documentation System

At the center of the documentation system is the InfoHub that supports both PDF and HTML
content. From the InfoHub, you can access all locally installed product documentation, system
administration documentation, videos, and tutorials. For users who want to use PDF, you have a
PDF bookcase file that provides access to all the installed PDF files.
For information on defining default HTML browsers, setting up browser options, and setting the
default PDF viewer, refer to the “Documentation Options” in the Mentor Documentation
System manual.

You can access the documentation in the following ways:

• Shell Command — On Linux platforms, enter mgcdocs at the shell prompt or invoke a
Tessent tool with the -manual invocation switch.

• File System — Access the Tessent InfoHub or PDF bookcase directly from your file
system, without invoking a Tessent tool. For example:
HTML:
firefox $MGC_DFT/docs/infohubs/index.html

PDF
acroread $MGC_DFT/docs/pdfdocs/_bk_tessent.pdf

• Application Online Help — ou can get contextual online help within most Tessent
tools by using the “help -manual” tool command. For example:
> help dofile -manual

This command opens the appropriate reference manual at the “dofile” command
description.

STILVerify User’s Manual, v2018.3 21

August 2018

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Getting Help
Mentor Support Services

Mentor Support Services

Mentor provides a range of industry-leading support services that keep design teams productive
and up-to-date with Mentor products.
A Mentor support contract includes the following:

• Software Updates — Get the latest releases and product enhancements to keep your
environment current.

• Mentor Graphics Support Center — Access our online knowledge base, personalized
to your Mentor products.

• Support Forums — Learn, share, and connect with other Mentor users.

• Technical Support — Collaborate with Mentor support engineers to solve complex

design challenges.

• Regular Communications — Receive the latest knowledge base articles and

announcements for your Mentor products.

• Mentor Ideas — Share ideas and vote for your favorites to shape future products.
More information is available here:

https://support.mentor.com

If your site is under a current support contract, but you do not have a Support Center login,
register today:

https://support.mentor.com/register

22 STILVerify User’s Manual, v2018.3

August 2018

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 Index
Index

—A—
ATE, 9
ATPG, 9
Automated Test Equipment, 9
Automatic Test Pattern Generation, 9
—B—
BIST, 9
Built-In-Self-Test, 9
—E—
EDA, 9
Electronic Design Automation, 9
—I—
IEEE, 9
Invocation, 17
—S—
Standard Test Interface Language, 9
STIL, 9
STILVerify, 9, 11

STILVerify User’s Manual, v2018.3 23

August 2018
24 STILVerify User’s Manual, v2018.3
August 2018
 Third-Party Information
For information about third-party software included with this release of Tessent products, refer to the Third-Party
Software for Tessent Products.

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Note - Viewing PDF files within a web browser causes some links not to function. Use HTML for full navigation.
 End-User License Agreement
The latest version of the End-User License Agreement is available on-line at:
www.mentor.com/eula

IMPORTANT INFORMATION

USE OF ALL SOFTWARE IS SUBJECT TO LICENSE RESTRICTIONS. CAREFULLY READ THIS LICENSE
AGREEMENT BEFORE USING THE PRODUCTS. USE OF SOFTWARE INDICATES CUSTOMER’S COMPLETE
AND UNCONDITIONAL ACCEPTANCE OF THE TERMS AND CONDITIONS SET FORTH IN THIS AGREEMENT.
ANY ADDITIONAL OR DIFFERENT PURCHASE ORDER TERMS AND CONDITIONS SHALL NOT APPLY.

END-USER LICENSE AGREEMENT (“Agreement”)

This is a legal agreement concerning the use of Software (as defined in Section 2) and hardware (collectively “Products”)
between the company acquiring the Products (“Customer”), and the Mentor Graphics entity that issued the corresponding
quotation or, if no quotation was issued, the applicable local Mentor Graphics entity (“Mentor Graphics”). Except for license
agreements related to the subject matter of this license agreement which are physically signed by Customer and an authorized
representative of Mentor Graphics, this Agreement and the applicable quotation contain the parties’ entire understanding
relating to the subject matter and supersede all prior or contemporaneous agreements. If Customer does not agree to these
terms and conditions, promptly return or, in the case of Software received electronically, certify destruction of Software and all
accompanying items within five days after receipt of Software and receive a full refund of any license fee paid.

1. ORDERS, FEES AND PAYMENT.

1.1. To the extent Customer (or if agreed by Mentor Graphics, Customer’s appointed third party buying agent) places and Mentor
Graphics accepts purchase orders pursuant to this Agreement (each an “Order”), each Order will constitute a contract between
Customer and Mentor Graphics, which shall be governed solely and exclusively by the terms and conditions of this Agreement,
any applicable addenda and the applicable quotation, whether or not those documents are referenced on the Order. Any
additional or conflicting terms and conditions appearing on an Order or presented in any electronic portal or automated order
management system, whether or not required to be electronically accepted, will not be effective unless agreed in writing and
physically signed by an authorized representative of Customer and Mentor Graphics.

1.2. Amounts invoiced will be paid, in the currency specified on the applicable invoice, within 30 days from the date of such invoice.
Any past due invoices will be subject to the imposition of interest charges in the amount of one and one-half percent per month
or the applicable legal rate currently in effect, whichever is lower. Prices do not include freight, insurance, customs duties, taxes
or other similar charges, which Mentor Graphics will state separately in the applicable invoice. Unless timely provided with a
valid certificate of exemption or other evidence that items are not taxable, Mentor Graphics will invoice Customer for all
applicable taxes including, but not limited to, VAT, GST, sales tax, consumption tax and service tax. Customer will make all
payments free and clear of, and without reduction for, any withholding or other taxes; any such taxes imposed on payments by
Customer hereunder will be Customer’s sole responsibility. If Customer appoints a third party to place purchase orders and/or
make payments on Customer’s behalf, Customer shall be liable for payment under Orders placed by such third party in the event
of default.

1.3. All Products are delivered FCA factory (Incoterms 2010), freight prepaid and invoiced to Customer, except Software delivered
electronically, which shall be deemed delivered when made available to Customer for download. Mentor Graphics retains a
security interest in all Products delivered under this Agreement, to secure payment of the purchase price of such Products, and
Customer agrees to sign any documents that Mentor Graphics determines to be necessary or convenient for use in filing or
perfecting such security interest. Mentor Graphics’ delivery of Software by electronic means is subject to Customer’s provision
of both a primary and an alternate e-mail address.

2. GRANT OF LICENSE. The software installed, downloaded, or otherwise acquired by Customer under this Agreement, including any
updates, modifications, revisions, copies, documentation, setup files and design data (“Software”) are copyrighted, trade secret and
confidential information of Mentor Graphics or its licensors, who maintain exclusive title to all Software and retain all rights not
expressly granted by this Agreement. Except for Software that is embeddable (“Embedded Software”), which is licensed pursuant to
separate embedded software terms or an embedded software supplement, Mentor Graphics grants to Customer, subject to payment of
applicable license fees, a nontransferable, nonexclusive license to use Software solely: (a) in machine-readable, object-code form
(except as provided in Subsection 4.2); (b) for Customer’s internal business purposes; (c) for the term of the license; and (d) on the
computer hardware and at the site authorized by Mentor Graphics. A site is restricted to a one-half mile (800 meter) radius. Customer
may have Software temporarily used by an employee for telecommuting purposes from locations other than a Customer office, such as
the employee’s residence, an airport or hotel, provided that such employee’s primary place of employment is the site where the
Software is authorized for use. Mentor Graphics’ standard policies and programs, which vary depending on Software, license fees paid
or services purchased, apply to the following: (a) relocation of Software; (b) use of Software, which may be limited, for example, to
execution of a single session by a single user on the authorized hardware or for a restricted period of time (such limitations may be
technically implemented through the use of authorization codes or similar devices); and (c) support services provided, including
eligibility to receive telephone support, updates, modifications, and revisions. For the avoidance of doubt, if Customer provides any
feedback or requests any change or enhancement to Products, whether in the course of receiving support or consulting services,
evaluating Products, performing beta testing or otherwise, any inventions, product improvements, modifications or developments made
by Mentor Graphics (at Mentor Graphics’ sole discretion) will be the exclusive property of Mentor Graphics.
3. BETA CODE.

3.1. Portions or all of certain Software may contain code for experimental testing and evaluation (which may be either alpha or beta,
collectively “Beta Code”), which may not be used without Mentor Graphics’ explicit authorization. Upon Mentor Graphics’
authorization, Mentor Graphics grants to Customer a temporary, nontransferable, nonexclusive license for experimental use to
test and evaluate the Beta Code without charge for a limited period of time specified by Mentor Graphics. Mentor Graphics may
choose, at its sole discretion, not to release Beta Code commercially in any form.

3.2. If Mentor Graphics authorizes Customer to use the Beta Code, Customer agrees to evaluate and test the Beta Code under normal
conditions as directed by Mentor Graphics. Customer will contact Mentor Graphics periodically during Customer’s use of the
Beta Code to discuss any malfunctions or suggested improvements. Upon completion of Customer’s evaluation and testing,
Customer will send to Mentor Graphics a written evaluation of the Beta Code, including its strengths, weaknesses and
recommended improvements.

3.3. Customer agrees to maintain Beta Code in confidence and shall restrict access to the Beta Code, including the methods and
concepts utilized therein, solely to those employees and Customer location(s) authorized by Mentor Graphics to perform beta
testing. Customer agrees that any written evaluations and all inventions, product improvements, modifications or developments
that Mentor Graphics conceived or made during or subsequent to this Agreement, including those based partly or wholly on
Customer’s feedback, will be the exclusive property of Mentor Graphics. Mentor Graphics will have exclusive rights, title and
interest in all such property. The provisions of this Subsection 3.3 shall survive termination of this Agreement.

4. RESTRICTIONS ON USE.

4.1. Customer may copy Software only as reasonably necessary to support the authorized use. Each copy must include all notices
and legends embedded in Software and affixed to its medium and container as received from Mentor Graphics. All copies shall
remain the property of Mentor Graphics or its licensors. Except for Embedded Software that has been embedded in executable
code form in Customer’s product(s), Customer shall maintain a record of the number and primary location of all copies of
Software, including copies merged with other software, and shall make those records available to Mentor Graphics upon
request. Customer shall not make Products available in any form to any person other than Customer’s employees and on-site
contractors, excluding Mentor Graphics competitors, whose job performance requires access and who are under obligations of
confidentiality. Customer shall take appropriate action to protect the confidentiality of Products and ensure that any person
permitted access does not disclose or use Products except as permitted by this Agreement. Customer shall give Mentor Graphics
written notice of any unauthorized disclosure or use of the Products as soon as Customer becomes aware of such unauthorized
disclosure or use. Customer acknowledges that Software provided hereunder may contain source code which is proprietary and
its confidentiality is of the highest importance and value to Mentor Graphics. Customer acknowledges that Mentor Graphics
may be seriously harmed if such source code is disclosed in violation of this Agreement. Except as otherwise permitted for
purposes of interoperability as specified by applicable and mandatory local law, Customer shall not reverse-assemble,
disassemble, reverse-compile, or reverse-engineer any Product, or in any way derive any source code from Software that is not
provided to Customer in source code form. Log files, data files, rule files and script files generated by or for the Software
(collectively “Files”), including without limitation files containing Standard Verification Rule Format (“SVRF”) and Tcl
Verification Format (“TVF”) which are Mentor Graphics’ trade secret and proprietary syntaxes for expressing process rules,
constitute or include confidential information of Mentor Graphics. Customer may share Files with third parties, excluding
Mentor Graphics competitors, provided that the confidentiality of such Files is protected by written agreement at least as well as
Customer protects other information of a similar nature or importance, but in any case with at least reasonable care. Customer
may use Files containing SVRF or TVF only with Mentor Graphics products. Under no circumstances shall Customer use
Products or Files or allow their use for the purpose of developing, enhancing or marketing any product that is in any way
competitive with Products, or disclose to any third party the results of, or information pertaining to, any benchmark.

4.2. If any Software or portions thereof are provided in source code form, Customer will use the source code only to correct software
errors and enhance or modify the Software for the authorized use, or as permitted for Embedded Software under separate
embedded software terms or an embedded software supplement. Customer shall not disclose or permit disclosure of source
code, in whole or in part, including any of its methods or concepts, to anyone except Customer’s employees or on-site
contractors, excluding Mentor Graphics competitors, with a need to know. Customer shall not copy or compile source code in
any manner except to support this authorized use.

4.3. Customer agrees that it will not subject any Product to any open source software (“OSS”) license that conflicts with this
Agreement or that does not otherwise apply to such Product.

4.4. Customer may not assign this Agreement or the rights and duties under it, or relocate, sublicense, or otherwise transfer the
Products, whether by operation of law or otherwise (“Attempted Transfer”), without Mentor Graphics’ prior written consent and
payment of Mentor Graphics’ then-current applicable relocation and/or transfer fees. Any Attempted Transfer without Mentor
Graphics’ prior written consent shall be a material breach of this Agreement and may, at Mentor Graphics’ option, result in the
immediate termination of the Agreement and/or the licenses granted under this Agreement. The terms of this Agreement,
including without limitation the licensing and assignment provisions, shall be binding upon Customer’s permitted successors in
interest and assigns.

4.5. The provisions of this Section 4 shall survive the termination of this Agreement.

5. SUPPORT SERVICES. To the extent Customer purchases support services, Mentor Graphics will provide Customer with updates and
technical support for the Products, at the Customer site(s) for which support is purchased, in accordance with Mentor Graphics’ then
current End-User Support Terms located at http://supportnet.mentor.com/supportterms.

6. OPEN SOURCE SOFTWARE. Products may contain OSS or code distributed under a proprietary third party license agreement, to
which additional rights or obligations (“Third Party Terms”) may apply. Please see the applicable Product documentation (including
license files, header files, read-me files or source code) for details. In the event of conflict between the terms of this Agreement
 (including any addenda) and the Third Party Terms, the Third Party Terms will control solely with respect to the OSS or third party
code. The provisions of this Section 6 shall survive the termination of this Agreement.

7. LIMITED WARRANTY.

7.1. Mentor Graphics warrants that during the warranty period its standard, generally supported Products, when properly installed,
will substantially conform to the functional specifications set forth in the applicable user manual. Mentor Graphics does not
warrant that Products will meet Customer’s requirements or that operation of Products will be uninterrupted or error free. The
warranty period is 90 days starting on the 15th day after delivery or upon installation, whichever first occurs. Customer must
notify Mentor Graphics in writing of any nonconformity within the warranty period. For the avoidance of doubt, this warranty
applies only to the initial shipment of Software under an Order and does not renew or reset, for example, with the delivery of (a)
Software updates or (b) authorization codes or alternate Software under a transaction involving Software re-mix. This warranty
shall not be valid if Products have been subject to misuse, unauthorized modification, improper installation or Customer is not in
compliance with this Agreement. MENTOR GRAPHICS’ ENTIRE LIABILITY AND CUSTOMER’S EXCLUSIVE
REMEDY SHALL BE, AT MENTOR GRAPHICS’ OPTION, EITHER (A) REFUND OF THE PRICE PAID UPON
RETURN OF THE PRODUCTS TO MENTOR GRAPHICS OR (B) MODIFICATION OR REPLACEMENT OF THE
PRODUCTS THAT DO NOT MEET THIS LIMITED WARRANTY. MENTOR GRAPHICS MAKES NO WARRANTIES
WITH RESPECT TO: (A) SERVICES; (B) PRODUCTS PROVIDED AT NO CHARGE; OR (C) BETA CODE; ALL OF
WHICH ARE PROVIDED “AS IS.”

7.2. THE WARRANTIES SET FORTH IN THIS SECTION 7 ARE EXCLUSIVE. NEITHER MENTOR GRAPHICS NOR ITS
LICENSORS MAKE ANY OTHER WARRANTIES EXPRESS, IMPLIED OR STATUTORY, WITH RESPECT TO
PRODUCTS PROVIDED UNDER THIS AGREEMENT. MENTOR GRAPHICS AND ITS LICENSORS SPECIFICALLY
DISCLAIM ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NON-INFRINGEMENT OF INTELLECTUAL PROPERTY.

8. LIMITATION OF LIABILITY. TO THE EXTENT PERMITTED UNDER APPLICABLE LAW, IN NO EVENT SHALL
MENTOR GRAPHICS OR ITS LICENSORS BE LIABLE FOR INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES (INCLUDING LOST PROFITS OR SAVINGS) WHETHER BASED ON CONTRACT, TORT OR ANY OTHER
LEGAL THEORY, EVEN IF MENTOR GRAPHICS OR ITS LICENSORS HAVE BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. IN NO EVENT SHALL MENTOR GRAPHICS’ OR ITS LICENSORS’ LIABILITY UNDER THIS
AGREEMENT EXCEED THE AMOUNT RECEIVED FROM CUSTOMER FOR THE HARDWARE, SOFTWARE LICENSE OR
SERVICE GIVING RISE TO THE CLAIM. IN THE CASE WHERE NO AMOUNT WAS PAID, MENTOR GRAPHICS AND ITS
LICENSORS SHALL HAVE NO LIABILITY FOR ANY DAMAGES WHATSOEVER. THE PROVISIONS OF THIS SECTION 8
SHALL SURVIVE THE TERMINATION OF THIS AGREEMENT.

9. THIRD PARTY CLAIMS.

9.1. Customer acknowledges that Mentor Graphics has no control over the testing of Customer’s products, or the specific
applications and use of Products. Mentor Graphics and its licensors shall not be liable for any claim or demand made against
Customer by any third party, except to the extent such claim is covered under Section 10.

9.2. In the event that a third party makes a claim against Mentor Graphics arising out of the use of Customer’s products, Mentor
Graphics will give Customer prompt notice of such claim. At Customer’s option and expense, Customer may take sole control
of the defense and any settlement of such claim. Customer WILL reimburse and hold harmless Mentor Graphics for any
LIABILITY, damages, settlement amounts, costs and expenses, including reasonable attorney’s fees, incurred by or awarded
against Mentor Graphics or its licensors in connection with such claims.

9.3. The provisions of this Section 9 shall survive any expiration or termination of this Agreement.

10. INFRINGEMENT.

10.1. Mentor Graphics will defend or settle, at its option and expense, any action brought against Customer in the United States,
Canada, Japan, or member state of the European Union which alleges that any standard, generally supported Product acquired
by Customer hereunder infringes a patent or copyright or misappropriates a trade secret in such jurisdiction. Mentor Graphics
will pay costs and damages finally awarded against Customer that are attributable to such action. Customer understands and
agrees that as conditions to Mentor Graphics’ obligations under this section Customer must: (a) notify Mentor Graphics
promptly in writing of the action; (b) provide Mentor Graphics all reasonable information and assistance to settle or defend the
action; and (c) grant Mentor Graphics sole authority and control of the defense or settlement of the action.

10.2. If a claim is made under Subsection 10.1 Mentor Graphics may, at its option and expense: (a) replace or modify the Product so
that it becomes noninfringing; (b) procure for Customer the right to continue using the Product; or (c) require the return of the
Product and refund to Customer any purchase price or license fee paid, less a reasonable allowance for use.

10.3. Mentor Graphics has no liability to Customer if the action is based upon: (a) the combination of Software or hardware with any
product not furnished by Mentor Graphics; (b) the modification of the Product other than by Mentor Graphics; (c) the use of
other than a current unaltered release of Software; (d) the use of the Product as part of an infringing process; (e) a product that
Customer makes, uses, or sells; (f) any Beta Code or Product provided at no charge; (g) any software provided by Mentor
Graphics’ licensors who do not provide such indemnification to Mentor Graphics’ customers; (h) OSS, except to the extent that
the infringement is directly caused by Mentor Graphics’ modifications to such OSS; or (i) infringement by Customer that is
deemed willful. In the case of (i), Customer shall reimburse Mentor Graphics for its reasonable attorney fees and other costs
related to the action.

10.4. THIS SECTION 10 IS SUBJECT TO SECTION 8 ABOVE AND STATES THE ENTIRE LIABILITY OF MENTOR
GRAPHICS AND ITS LICENSORS, AND CUSTOMER’S SOLE AND EXCLUSIVE REMEDY, FOR DEFENSE,
 SETTLEMENT AND DAMAGES, WITH RESPECT TO ANY ALLEGED PATENT OR COPYRIGHT INFRINGEMENT
OR TRADE SECRET MISAPPROPRIATION BY ANY PRODUCT PROVIDED UNDER THIS AGREEMENT.

11. TERMINATION AND EFFECT OF TERMINATION.

11.1. If a Software license was provided for limited term use, such license will automatically terminate at the end of the authorized
term. Mentor Graphics may terminate this Agreement and/or any license granted under this Agreement immediately upon
written notice if Customer: (a) exceeds the scope of the license or otherwise fails to comply with the licensing or confidentiality
provisions of this Agreement, or (b) becomes insolvent, files a bankruptcy petition, institutes proceedings for liquidation or
winding up or enters into an agreement to assign its assets for the benefit of creditors. For any other material breach of any
provision of this Agreement, Mentor Graphics may terminate this Agreement and/or any license granted under this Agreement
upon 30 days written notice if Customer fails to cure the breach within the 30 day notice period. Termination of this Agreement
or any license granted hereunder will not affect Customer’s obligation to pay for Products shipped or licenses granted prior to
the termination, which amounts shall be payable immediately upon the date of termination.

11.2. Upon termination of this Agreement, the rights and obligations of the parties shall cease except as expressly set forth in this
Agreement. Upon termination of this Agreement and/or any license granted under this Agreement, Customer shall ensure that
all use of the affected Products ceases, and shall return hardware and either return to Mentor Graphics or destroy Software in
Customer’s possession, including all copies and documentation, and certify in writing to Mentor Graphics within ten business
days of the termination date that Customer no longer possesses any of the affected Products or copies of Software in any form.

12. EXPORT. The Products provided hereunder are subject to regulation by local laws and European Union (“E.U.”) and United States
(“U.S.”) government agencies, which prohibit export, re-export or diversion of certain products, information about the products, and
direct or indirect products thereof, to certain countries and certain persons. Customer agrees that it will not export or re-export Products
in any manner without first obtaining all necessary approval from appropriate local, E.U. and U.S. government agencies. If Customer
wishes to disclose any information to Mentor Graphics that is subject to any E.U., U.S. or other applicable export restrictions, including
without limitation the U.S. International Traffic in Arms Regulations (ITAR) or special controls under the Export Administration
Regulations (EAR), Customer will notify Mentor Graphics personnel, in advance of each instance of disclosure, that such information
is subject to such export restrictions.

13. U.S. GOVERNMENT LICENSE RIGHTS. Software was developed entirely at private expense. The parties agree that all Software is
commercial computer software within the meaning of the applicable acquisition regulations. Accordingly, pursuant to U.S. FAR 48
CFR 12.212 and DFAR 48 CFR 227.7202, use, duplication and disclosure of the Software by or for the U.S. government or a U.S.
government subcontractor is subject solely to the terms and conditions set forth in this Agreement, which shall supersede any
conflicting terms or conditions in any government order document, except for provisions which are contrary to applicable mandatory
federal laws.

14. THIRD PARTY BENEFICIARY. Mentor Graphics Corporation, Mentor Graphics (Ireland) Limited, Microsoft Corporation and
other licensors may be third party beneficiaries of this Agreement with the right to enforce the obligations set forth herein.

15. REVIEW OF LICENSE USAGE. Customer will monitor the access to and use of Software. With prior written notice and during
Customer’s normal business hours, Mentor Graphics may engage an internationally recognized accounting firm to review Customer’s
software monitoring system and records deemed relevant by the internationally recognized accounting firm to confirm Customer’s
compliance with the terms of this Agreement or U.S. or other local export laws. Such review may include FlexNet (or successor
product) report log files that Customer shall capture and provide at Mentor Graphics’ request. Customer shall make records available in
electronic format and shall fully cooperate with data gathering to support the license review. Mentor Graphics shall bear the expense of
any such review unless a material non-compliance is revealed. Mentor Graphics shall treat as confidential information all information
gained as a result of any request or review and shall only use or disclose such information as required by law or to enforce its rights
under this Agreement. The provisions of this Section 15 shall survive the termination of this Agreement.

16. CONTROLLING LAW, JURISDICTION AND DISPUTE RESOLUTION. The owners of certain Mentor Graphics intellectual
property licensed under this Agreement are located in Ireland and the U.S. To promote consistency around the world, disputes shall be
resolved as follows: excluding conflict of laws rules, this Agreement shall be governed by and construed under the laws of the State of
Oregon, U.S., if Customer is located in North or South America, and the laws of Ireland if Customer is located outside of North or
South America or Japan, and the laws of Japan if Customer is located in Japan. All disputes arising out of or in relation to this
Agreement shall be submitted to the exclusive jurisdiction of the courts of Portland, Oregon when the laws of Oregon apply, or Dublin,
Ireland when the laws of Ireland apply, or the Tokyo District Court when the laws of Japan apply. Notwithstanding the foregoing, all
disputes in Asia (excluding Japan) arising out of or in relation to this Agreement shall be resolved by arbitration in Singapore before a
single arbitrator to be appointed by the chairman of the Singapore International Arbitration Centre (“SIAC”) to be conducted in the
English language, in accordance with the Arbitration Rules of the SIAC in effect at the time of the dispute, which rules are deemed to be
incorporated by reference in this section. Nothing in this section shall restrict Mentor Graphics’ right to bring an action (including for
example a motion for injunctive relief) against Customer in the jurisdiction where Customer’s place of business is located. The United
Nations Convention on Contracts for the International Sale of Goods does not apply to this Agreement.

17. SEVERABILITY. If any provision of this Agreement is held by a court of competent jurisdiction to be void, invalid, unenforceable or
illegal, such provision shall be severed from this Agreement and the remaining provisions will remain in full force and effect.

18. MISCELLANEOUS. This Agreement contains the parties’ entire understanding relating to its subject matter and supersedes all prior
or contemporaneous agreements. Any translation of this Agreement is provided to comply with local legal requirements only. In the
event of a dispute between the English and any non-English versions, the English version of this Agreement shall govern to the extent
not prohibited by local law in the applicable jurisdiction. This Agreement may only be modified in writing, signed by an authorized
representative of each party. Waiver of terms or excuse of breach must be in writing and shall not constitute subsequent consent, waiver
or excuse.

Rev. 170330, Part No. 270941