WBUT Previous Years Question Papers EC Eda For Vlsi Design B Tech Sem 7th 2010-11

WBUT Previous Years Question Papers EC

Eda For Vlsi Design B Tech Sem 7th 2010-11

Time Allotted ; 3 Hours

Fuil Mark$: 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A ( Multiple Choice Type Questions )

  1. Choose the correct answer for any ten of the following :

10 x 1 * 10

i)         Synthesis translates from

a)        Physical description to behavioral description

b)        Structural to physical description

c)        Behavioral description to structural description

d)        Structural description to behavioral description

ii)       Channelless Gate array is a sub-type of a) FPGA       b) PLD.

c) ASIC                              d) Microprocessor.

iii)      BDD is useful for

a)        High level synthesis

b)        Logic level synthesis

c)        Testing

d)        Timing analysis.

iv)      FPGA is a

a)        full-custom ASIC b) semi-custom ASIC c) programmable ASIC d) structured ASIC.

v)        VHDL codes are inherently

a)       Sequential   b) Concurrent,

c)      Both (a) and (b)     d) Cyclic.

vi)      Which one is not a task of High Level Synthesis ?

a)        Partitioning                       b) Scheduling

c)        Allocation                        d) Binding.

vii)     Which graph representation is not used in Floor planning ?

a)        Polar graph

b)  Adjacency                                                      ,

c)        Channel position graph

d)        Block placement graph

viii)   Scan design technique is used for testing which provides

a)     Controllability       b) Observe ability

c)       Scanning   , d) Both (a) & (b).

ix)      In VHDI, Generic command is

a)        Local declaration

b)        Global declaration

c)        Both locally and globally


None of these.

x)        Which technology is not used in FPGA ?

a)        Static RAM technology

b)        Dynamic RAM technology

c)        Anti-fuse technology

d)        EEROM technology.

xi)      High level synthesis has design constraints like

a)        area                                  b) timing

c)         power   d) all of these.

xii)     CLBs are used in

a)        gate array design style

b)        standard cell based design

c)        Field programmable gate array layout

d)       full custom design.

GROUP-B ( Short Answer Type Questions )

Answer any three of the following.3×5

  1. What do yoii mean by High Level Synthesis ? What are the
  2. general steps in high level synthesis ?                         2 + 3
  1. Give a brief description of Binary Decision Diagram in the context of logic level synthesis ? 5
  2. Explain with example the differences in between signal and variable in VHDL. ✓       5
  3. Find the minimal complete set of tests for stuck-at faults in the circuit as shown in the Fig.
  1. Distinguish between Dynamic and Static timing analysis. 5

GROUP -C ( Long Answer Type Questions )

Answer any three of the following.

a) Describe the p-well fabrication process with necessary


b)        What is the minimum width of polysilicon ?

c)        What are fi-based design and A-based design in VLSI system ?

d)        Draw the 3-input CMOS NAND gate using layout technique.  8 + 1 + 3 + 3

  1. a) Why has verification an important role in High Level

Synthesis ?

b)        Define “stuck-at-0”, “stuck-at-one” and bridging faults with example.

c)  Define observability and controllability.          5 + 7 + 3

  1. a) Implement a 4 : 1 multiplexer in VHDL code using

mixed style of modelling.

b)        Define the term Synthesis and discuss the different level of Synthesis.

c)   What is data path ?                                 5 + (3 + 5) + 2

  1. a) What is ASIC?

b)        Discuss ASIC design options.

c)        What are the advantages and disadvantages of FPGA compared to ASIC ?

d)        Give a brief description of design’issues and tools.

e)     What is the full form of CDFG ?           2 + 4 + 3 + 5+1

  1. Write short notes on any three of the following :

a)        Reduced Ordered Binaiy Decision Diagrams.

b)        Routing

c)        Classification of an ASIC                   .

d)        Formal Verification

e)        VLSI design flow.

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