JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisite

Digital System Design

Course Objectives:

• 1. To acquire the knowledge of fundamental concepts in fault tolerant design.
• 2. To provide broad understanding of fault diagnosis and tolerant design approach.
• 3. To illustrate the framework of test pattern generation using semi and full automatic approach.

Course Outcomes

Students will be able to

• 1. Acquire Design knowledge of requirements of self check-in circuits and LFSR.
• 2. Knowledge of design for testability rules and techniques for combinational circuits.
• 3. Utilize the scan architectures for different digital circuits.
• 4. Acquire the knowledge of design of built-in-self test.

UNIT - I

Fault Tolerant Design: Basic concepts: Reliability concepts, Failures & faults, Reliability and Failure rate, Relation between reliability and mean time between failure, maintainability and availability, reliability of series, parallel and parallel-series combinational circuits. Fault Tolerant Design: Basic concepts-static, dynamic, hybrid, triple modular redundant system (TMR), 5MR reconfiguration techniques, Data redundancy, Time redundancy and software Redundancy concepts. [TEXTBOOK-1]

UNIT - II

Self Checking circuits &Fail safe Design: Basic concepts of self checking circuits, Design of Totally self checking checker, Checkers using m out of n codes, Berger code, Low cost residue code. Fail Safe Design- Strongly fault secure circuits, fail safe design of sequential circuits using partition theory and Berger code, totally self checking PLA design. [TEXTBOOK-1]

UNIT - III

Design for Testability: Design for testability for combinational circuits: Basic concepts of Testability, Controllability and observability, The Reed Muller’s expansion technique, use of control and syndrome testable designs. Design for testability by means of scan: Making circuits Testable, Testability Insertion, Full scan DFT technique- Full scan insertion, flip-flop Structures, Full scan design and Test, Scan Architectures-full scan design, Shadow register DFT, Partial scan methods, multiple scan design, other scan designs.[TEXTBOOK-2]

UNIT - IV

Logic Built-in-self-test: BIST Basics-Memory-based BIST,BIST effectiveness, BIST types, Designing a BIST, Test Pattern Generation-Engaging TPGs, exhaustive counters, ring counters, twisted ring counter, Linear feedback shift register, Output Response Analysis-Engaging ORA’s, One’s counter, transition counter, parity checking, Serial LFSRs, Parallel Signature analysis, BIST architectures-BIST related terminologies, A centralized and separate Board-level BIST architecture, Built-in evaluation and self test(BEST), Random Test socket (RTS), LSSD On-chip self test, Self –testing using MISR and SRSG, Concurrent BIST, BILBO, Enhancing coverage, RT level BIST design-CUT design, simulation and synthesis, RTS BIST insertion, Configuring the RTS BIST, incorporating configurations in BIST, Design of STUMPS, RTS and STUMPS results. [TEXTBOOK-2]

UNIT - V

Standard IEEE Test Access Methods: Boundary Scan Basics, Boundary scan architecture- Test access port, Boundary scan registers, TAP controller, the decoder unit, select and other units, Boundary scan Test Instructions-Mandatory instructions, Board level scan chain structure-One serial scan chain, multiple-scan chain with one control test port, multiple-scan chains with one TDI,TDO but multiple TMS, Multiple-scan chain, multiple access port, RT Level boundary scan-inserting boundary scan test hardware for CUT, Two module test case, virtual boundary scan tester, Boundary Scan Description language. [TEXTBOOK-2]

TEXT BOOKS:

• 1. Fault Tolerant & Fault Testable Hardware Design- Parag K.Lala,PHI, 1984.
• 2. Digital System Test and Testable Design using HDL models and Architectures - ZainalabedinNavabi, Springer International Ed.,

REFERENCE BOOKS:

• 1. Digital Systems Testing and Testable Design-MironAbramovici, Melvin A.Breuer and Arthur D. Friedman, Jaico Books
• 2. Essentials of Electronic Testing- Bushnell &VishwaniD.Agarwal,Springers.
• 3. Design for Test for Digital IC’s and Embedded Core Systems- Alfred L. Crouch, 2008 M.TECH.- I YEAR- II SEMESTER DIGITAL SYSTEMS & COMPUTER ELECTRONICS