Lecture_4 - 9/8/2011 Overview Motivation Logic Modeling ECE...

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9/8/2011 1 ECE 553: TESTING AND TESTABLE DESIGN OF DIGITAL SYSTES Logic Modeling 9/8/2011 2 Overview • Motivation • Logic Modeling – Model types – Models at different levels of abstractions – Models and definitions • Summary 9/8/2011 3 Motivation – Models are often easier to work with – Models are portable – Models can be used for simulation, thus avoiding expensive hardware/actual circuit implementation – Nearly all engineering systems are studied using models – All the above apply for logic as well as for fault modeling 9/8/2011 4 Logic Modeling – Model types Behavior – System at I/O level – Timing inf provided – Internal details missing Functional – DC behavior – no timing Structural – Gate level description External representation Internal representation Models are often described using an hierarchy 9/8/2011 5 Hierarchical Model: A Full-Adder HA; inputs: a, b; outputs: c, f; AND: A1, (a, b), (c); AND: A2, (d, e), (f); OR: O1, (a, b), (d); NOT: N1, (c), (e); a b c d
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Lecture_4 - 9/8/2011 Overview Motivation Logic Modeling ECE...

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