1. A Trojan writer must ensure that his/her Trojan circuitry is not likely to be detected during manufacturing test, and thus understanding how test works is important. Consider the following circuit. ABC с DE = P sa0 F DG a) What is the probability of detecting the fault P sa0 with a random test pattern? b) Provide a test pattern (assignment of values to the inputs) that detects this fault.

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1. A Trojan writer must ensure that his/her Trojan circuitry is not likely to be detected
during manufacturing test, and thus understanding how test works is important.
Consider the following circuit.
A BC
с
DE
P sa0
F
a) What is the probability of detecting the fault P sa0 with a random test pattern?
b) Provide a test pattern (assignment of values to the inputs) that detects this fault.
2. Consider the following circuit that contains a Trojan circuitry shown in red. Assume that
the inputs are statistically independent and have a 50/50 chance of being a logic one.
P sa0
a) What is the probability of triggering the Trojan with a random pattern?
b) What is the probability of observing the Trojan with a random pattern?
c) What is the probability of detecting the Trojan with a random pattern?
d) What is the probability of detecting the Trojan with a test for P sao?
Transcribed Image Text:1. A Trojan writer must ensure that his/her Trojan circuitry is not likely to be detected during manufacturing test, and thus understanding how test works is important. Consider the following circuit. A BC с DE P sa0 F a) What is the probability of detecting the fault P sa0 with a random test pattern? b) Provide a test pattern (assignment of values to the inputs) that detects this fault. 2. Consider the following circuit that contains a Trojan circuitry shown in red. Assume that the inputs are statistically independent and have a 50/50 chance of being a logic one. P sa0 a) What is the probability of triggering the Trojan with a random pattern? b) What is the probability of observing the Trojan with a random pattern? c) What is the probability of detecting the Trojan with a random pattern? d) What is the probability of detecting the Trojan with a test for P sao?
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