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09_PODEM

# 09_PODEM - Testing Digital Systems I Testing Digital...

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Testing Digital Systems I Lecture 9 1 Copyright 2010, M. Tahoori TDS I: Lecture 9 1 Testing Digital Systems I Lecture 9: Boolean Testing Using Fault Models (D-Algorithm, PODEM) Instructor: M. Tahoori Copyright 2010, M. Tahoori TDS I: Lecture 9 2 D Algorithm (More Examples)

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Testing Digital Systems I Lecture 9 2 Copyright 2010, M. Tahoori TDS I: Lecture 9 3 Example: A/0 Step 1 D-Drive: Set A = 1 D 1 D Copyright 2010, M. Tahoori TDS I: Lecture 9 4 Example: A/0 Step 2 D-Drive : Set f = 0 D 1 0 D D
Testing Digital Systems I Lecture 9 3 Copyright 2010, M. Tahoori TDS I: Lecture 9 5 Example: A/0 Step 3 D-Drive : Set k = 1 D 1 0 D D 1 D Copyright 2010, M. Tahoori TDS I: Lecture 9 6 Example: A/0 Step 4 Consistency: Set g = 1 D 1 0 D D 1 D 1

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Testing Digital Systems I Lecture 9 4 Copyright 2010, M. Tahoori TDS I: Lecture 9 7 Example: A/0 Step 5 Consistency: f = 0 Already set D 1 0 D D 1 D 1 Copyright 2010, M. Tahoori TDS I: Lecture 9 8 Example: A/0 Step 6 Consistency: Set c = 0, Set e = 0 D 1 0 D D 1 D 1 0 0
Testing Digital Systems I Lecture 9 5 Copyright 2010, M. Tahoori TDS I: Lecture 9 9 Example: A/0 Step 7 Consistency: Set B = 0 Test found: ABCD = 100X D 1 0 X D D 1 D 1 0 0 0 Copyright 2010, M. Tahoori TDS I: Lecture 9 10 Example s/1 Primitive D-cube of Failure 1 D sa1

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Testing Digital Systems I Lecture 9 6 Copyright 2010, M. Tahoori TDS I: Lecture 9 11 Example s/1 Propagation D-cube for v D 0 sa1 D 1 D 1 Copyright 2010, M. Tahoori TDS I: Lecture 9 12 Example s/1 Forward & Backward Implications 1 D sa1 0 D D 1 1 0 1 1
Testing Digital Systems I Lecture 9 7 Copyright 2010, M. Tahoori TDS I: Lecture 9 13 Example s/1 Propagation D-cube for Z test found! 1 D sa1 0 D D 1 1 0 1 1 1 D Copyright 2010, M. Tahoori TDS I: Lecture 9 14 Example: u/1 Primitive D-cube of Failure 1 D 0 sa1

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Testing Digital Systems I Lecture 9 8 Copyright 2010, M. Tahoori TDS I: Lecture 9 15 Example: u/1 Propagation D-cube for v 1 D 0 sa1 D 0 Copyright 2010, M. Tahoori TDS I: Lecture 9 16 Example: u/1 Forward and backward implications 1 D 0 sa1 D 0 0 1 0 1 0
Testing Digital Systems I Lecture 9 9 Copyright 2010, M. Tahoori TDS I: Lecture 9 17 Example: u/1 Inconsistency d = 0 and m = 1 cannot justify r = 1 (equivalence) Backtrack Remove B = 0 assignment Copyright 2010, M. Tahoori TDS I: Lecture 9 18 Example: u/1 Backtrack Need alternate propagation D-cube for v 1 sa1 D 0

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Testing Digital Systems I Lecture 9 10 Copyright 2010, M. Tahoori TDS I: Lecture 9 19 Example: u/1 Propagation D-cube for v 1 sa1 D 0 1 D Copyright 2010, M. Tahoori TDS I: Lecture 9 20 Example: u/1 Propagation D-cube for Z D 1 sa1 D 0 1 D 1 1
Testing Digital Systems I Lecture 9 11 Copyright 2010, M. Tahoori TDS I: Lecture 9 21 Example: u/1 D 1 sa1 D 0 1 D 1 1 0 0 0 1 1

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09_PODEM - Testing Digital Systems I Testing Digital...

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