2010Fall_midterm

2010Fall_midterm - UNIVERSITY OF CALIFORNIA Santa Barbara...

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UNIVERSITY OF CALIFORNIA Santa Barbara Department of Electrical and Computer Engineering ECE255A Fall 2010 MID-TERM EXAMINATION Name: _______________________________ PERM: ____________________________ Note: Open book, open notes Problem Number Weight Score 1. 6 _________________ 2. 6 _________________ 3. 10 _________________ 4. 10 _________________ 5. 10 _________________ 6. 10 _________________ 7. 14 __________________ 8. 14 __________________ ___________________________________________________________________ Total 80 __________________
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1. (6 pts.) Is the double-stuck-at fault ( f1 , f2 ) in a combinational circuit detected, undetected, or unknown by a test T , if fault simulation of T for single-stuck-at faults, f1 and f2 , produces the following result? (a) (1 pt) Both f1 and f2 are detected. Your answer: __________________ (b) (1 pt) Only f1 is detected. Your answer: _________________________ (c) (1 pt) Neither is detected. Your answer: _________________________ Answer the above questions again if we know f1 is a single-stuck-at fault on a primary output and f2 is a single-stuck-at fault on an internal signal. (a) (1 pt) Both f1 and f2 are detected. Your answer: __________________ (b) (1 pt) Only f1 is detected. Your answer: _________________________ (c) (1 pt) Neither is detected. Your answer: _________________________ 2. (6 pts.) There are two test sequences S1 and S2 for a sequential circuit with 3 primary inputs, each of which has 3 vectors:
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This note was uploaded on 12/29/2011 for the course ECE 254b taught by Professor Parhami,b during the Fall '08 term at UCSB.

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2010Fall_midterm - UNIVERSITY OF CALIFORNIA Santa Barbara...

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