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Design for Testability and for Built-in Self Test What you will learn: In this course you will learn all aspects of Design for Testability, from what it is, why you might need it, why someone would object to it, and what it can and cannot accomplish. You will learn how today's technology has become elusive to certain failure modes and how important it is to expose them through more testable designs. First you will learn some simple techniques to enhance observability and controllability. You will learn how you can access hundreds of internal points with as few as four additional edge connector pins. You will learn specific guidelines for both digital and analog circuit testability. You will learn structured testability techniques, such as internal and boundary-scan. You will come away with a deep understanding of the IEEE 1149.1 (JTAG) standard's operation, use and even its limitations. You will also learn some new techniques in testability, including IDDQ testing and I/O Mapping.
In the second part of the course, you will learn what built-in [self] test (BIST) is and how it can be specified. You will learn structures such as linear feedback shift registers (LFSRs), signature analyzers, and pseudo-random signal generators. With these building blocks you will be able to evaluate a number of BIST architectures. You will learn BIT Software techniques and consider the effect false alarms have on BIT. You will finally be able to specify BIT for your products and look at the possibilities of BIT taking over some of the ATE functions. Abstract: This is really two courses combined into one. The first part, Design for Testability provides the guidelines necessary to improve circuit design from a test perspective. It includes simple and easy-to-implement ad-hoc testability guidelines. Then the course looks at more sophisticated structured approaches to testability that can be placed into ICs and boards. Special emphasis will be given to boundary-scan, the (JTAG) IEEE-1149.1. Analog circuit testability builds on the IEEE-1149.1 and is now the Mixed-Signal testability standard, designated as IEEE-1149.4. We examine this standard as well as the IEEE-1149.6 standard for AC Signal and transmission. We will look at other related standards in development, such as the IEEE-1532, IJTAG and SJTAG.
The second part of the course will cover Built-In Test. Starting with classification of Built-In Test approaches, the course introduces the building blocks of built-in self test (BIST) architectures. The course then examines some of these architectures, including Random Test Socket (RTS), the Built-In Logic Block Observer (BILBO), the Cyclic Analysis Testing Systems (CATS), the Built-In Test Exerciser and Sensor (BITES), and others. BIT software is also covered and a discussion on BIT false alarms is included. Finally, a hierarchical approach to BIT is examined, which offers a reduction if not elimination of ATE in both a manufacturing and maintenance environment.
Who should attend: This is a design course, intended for designers and for those who motivate them for testability, such as test engineers. Managers concerned with testability issues will also find this course useful. Anyone interested in boundary-scan (JTAG/IEEE-1149.1) will agree with many of our graduates who called this the best course available on the subject. Since Built-In Test is becoming an issue of concern for top management as well as to marketing, this course - though a bit on the technical side - does examine applications for BIST in a product.
Detail: DESIGN FOR TESTABILITYIntroduction to Design for TestabilityWhat is Design for Testability? Quality As a Function of Yield and Test Coverage Fault Models Effect of Time-to-Market On Profits Technical Goals of Testable Designs Considerations for Testability Approaches to Design for Testability
Design for Testability Attributes
Basic Ad Hoc Design for Testability Rules Controllability
Observability
Partitioning to Functionally Independent Sub-Systems
Methods for Breaking Feedback Loops Breaking Long Counters and Shift Registers Methods for Breaking Free Running Clocks Application of Testability GuidelinesAnalog Testability
Testability for Memories Design for Inspection (Inspectability) Mechanical Design for Testability Documentation for Testability Other Testability Techniques
IDDQ Testing
Evaluating Designs for Testability
Structured Design for TestabilityTechnical Goals of Testable Designs General Structure of Scan Scan Design Mode of Operation
Boundary Scan Structure The Boundary Scan Cell and JTAG/IEEE-1149.1 Construction Of The Test Access Port (TAP)
Boundary-Scan Registers Boundary-Scan Operational Modes
Boundary-Scan Description Language (BSDL) Boundary-Scan Tests
Mixed Signal Boundary Scan Using the IEEE-1149.4 AC EXTEST Using the IEEE-1149.6 Other Testability Guidelines
Evaluating Designs for Testability
Built-In Self TestTechnical Approach to BISTForms Of Built-In Self Test
Elements of a BIST Architecture Types of BIST BIST Classification BIST Using Error Detection Codes Error-Correcting Codes BIST Using Set/Scan Logic
BIST Signal Generation tools Test Generation Methods for BIST BIST Response Collection tools BIST Architectures
BIST and BITE Architectures
General Structure Of Non-Concurrent BIST Built-in Test (BIT) SoftwareWhy use BIT Software? BIT Software Considerations
Failure Analysis Software
Evaluating BIT Basic BIT and BITE Requirements Self Checking BIT and BIST BIT False Alarms
BIT Specification Manufacturing Test Strategies with Hierarchical BIT Maintenance Test and Repair Strategies with Hierarchical BIT What happens to ATE? Instructor: Louis Y. Ungar Louis Y. Ungar is president of A.T.E. Solutions, Inc., a leading independent test and testability consulting and educational firm. He has taught ATE and Testability courses at the University of California at Los Angeles (UCLA) and throughout industry. Mr. Ungar is a consultant to The American Society of Test Engineers, has served as Testability Chair for the Surface Mount Technology Association and has served on committees for various IEEE standards, including those of IEEE Std. 1149.x. Mr. Ungar holds a B.S.E.E. and Computer Science degree from the UCLA and has completed his course work towards a M.A. in Management.
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