Bengal Engineering and Science University 2007 B.E Computer Science and Engineering Digital System Design - Question Paper
The ques. paper is with the attachment.
BE (8th Semester) Examination, 2007
Subject: Digital System Design Code No. CST ft03/5~
Branch: Computer Science and T.ckotagy Engineering
Time: 3 Hours Full Marks: 100 V
Answer any five questions
1.
A
B
Z 2
Fig. 1
a) Find the set of all tests that distinguish the faults a s-a-0 and c s-a-0? 5
b) Find the set of all tests that distinguish the multiple faults {a s-a-0, b s-a-1} and {c s-a-0, b s-a-1}? 7
c) Find a counter example to the following statement:
8
In a Combinational circuit two faults f and g are functionally equivalent iff they are always detected by the same tests.
2 a. Find the equivalence partition for the machine shown in Table - 1? 10
2 b. Find a minimum length sequence that distinguishes state A from state D? 6
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PS |
NS, Z | |
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x=o |
X=1 | |
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A |
B, 1 |
H, 1 |
|
B |
F, 1 |
D, 1 |
|
C |
D, 0 |
E, 1 |
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D |
C, 0 |
F, 1 |
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E |
D, 1 |
C,1 |
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F |
C, 1 |
C, 1 |
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G |
C, 1 |
D, 1 |
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H |
C,0 |
A, 1 |
2c. Draw a redundant circuit and explain it with example. 4
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G, G3 |
 |
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Fig 2 |
a) Construct Singular Cover and propagation D-cube for the circuit of fig.2.
b) Find the test set for s-a-0 fault at the line 6 using D-algorithm?
c) What are the Advantages of PODEM and FAN Algorithm in comparison to D-Algorithm?
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a. Find the test set for s-a-0 fault at the line 9 using D-algorithm? 10 |
 |
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Fig.4 b. Find the test set for s-a-0 fault at the line 8 using PODEM algorithm. 10 |
5. Define Boolean Difference of a function. Use Boolean Difference for finding tests for the function,
F = (X, + X2)X'3 + X3X4 + X,X2
i) detecting X4 stuck at 0
ii) detecting X3 stuck at 1
5b. Given the fault table shown in the following figure, where z denotes the fault-free output for the corresponding test.
Find a minimal set of tests to detect all single faults. 10
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TABLE 2. | |||||||||||||||||||||||||||||||||||||||||||||||
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6.
5
 |
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Fig.5 |
a) Find the test set for s-a-0 fault at the line 6 using PODEM algorithm. 10
6b.
 |
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Fig.6 b) Find the test set for L-SA-1 fault using FAN algorithm |
10
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Attachment: |
| Earning: Approval pending. |
