F E1223 Pages: 3

3 a) Analyse the below given CSSN. (7)

Cnt

Do 0 elie 3 12

[2 1]

Clk

b) Design a Pepsi vending machine. The machine is to accept | and 2 dollar notes (8)
only. The amount for a Pepsi is 5 dollars. (77 is not necessary that the machine

gives the balance amount).

PART छ
Answer any two full questions, each carries 15 marks.

4 a) With neat circuit diagrams, differentiate between static and dynamic hazards. (for (7)

both 0 and 1 hazards in both)
0) What do you mean by contact bounce? How do you eliminate contact bounce? (8)

Support the explanations with neat circuit diagrams and waveforms named clearly.
Also draw the logic diagram for SR latch with the truth table.

5 a) Using path sensitization method, find the test vectors for detecting stuck at faults (8)

at x6 and x9 for the below given circuit.

b) Draw the logic diagram for the expression f= a.b’.c + (d’.e’). Find the test vectors (7)

for detecting the faults at input line a and d using Boolean difference method.

Page 2 of 3