VLSI Built-in Self Test MCQ Quiz – Objective Question with Answer for Built-in Self Test for VLSI

Built-in self-test aims to

A. reduce test pattern generation cost
B. reduce the volume of test data
C. reduce test time
D. all of the mentioned

Answer: D

Built-in self-test objectives are to reduce test pattern generation cost, reduce the volume of test data, and reduce test time.

2. In the data compression technique, the comparison is done on

A. test response
B. entire test data
C. data inputs
D. output sequences

Answer: A

In the data compression technique, the comparison is made on compacted test responses instead of entire test data.

3. Signature analysis performs

A. addition
B. multiplication
C. polynomial division
D. amplifies

Answer: C

Signature analysis performs polynomial division that is division of data out of the device under test.

4. The signature analysis method can be represented mathematically as

A. R(x) = P(x) * C(x)
B. R(x) = P(x) / C(x)
C. R(x) = C(x) / P(x)
D. R(x) = C(x) * P(x)

Answer: B

The signature analysis method is represented mathematically as R(x) = P(x) / C(x) where R(x) is the signature, C(x) is characteristic polynomial.

5. Transition counting does the count of transition only in one specific direction at a time.

A. true
B. false

Answer: A

Transition counting does the count of transition in the specified direction (0 t0 1 or 1 to 0).

6. BILBO uses only the signature analysis.

A. true
B. false

Answer: B

The built-in logic block observer method uses signature analysis in conjunction with a scan path.

7. In which mode, storage elements are used independently?

A. normal mode
B. test 1 mode
C. test 2 mode
D. final mode

Answer: A

In normal mode, storage elements are used independently, and in this mode signal B1=B2=1.

8. Storage elements are connected as a serial shift register when

A. B1=B2=1
B. B1=B2=0
C. B1=0, B2=1
D. B1=1, B2=0

Answer: B

When B1=B2=0 storage elements are configured as scan paths, they are connected as a serial shift registers.

9. The circuit is configured as LFSR, when

A. B1=B2=1
B. B1=B2=0
C. B1=0, B2=1
D. B1=1, B2=0

Answer: D

When B1=1 and B2=0 the circuit is configured as LFSR mode and can be used as either polynomial divider or random test pattern generator.

10. The BILBO is reset, when

A. B1=B2=1
B. B1=B2=0
C. B1=0, B2=1
D. B1=1, B2=0

Answer: C

When B1=0 and B2=1 are in the final mode, the BILBO is reset.

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