Sunday, November 14, 2010


Fourth Semester B.E Degree Examination, May/June 2010
Fundamentals of HDL

1 a. Explain the behavioral and structural description types of HDL programming, with   examples and keywords used.                                                                (10 Marks)
b. Explain the following data types:                                                   (10 Marks)
     i) Physical  std_logic and bit_vector in VHDL
    ii) Nets, parameters and registers in verilog.

2 a. How do you assign a delay time to the signal assignment statement? Explain the dataflow model of 2x1 multiplexer in VHDL and verilog.                  (10 Marks)
b. Explain the use of data type vectors with dataflow description of 2x2 unsigned combinational array multiplier in VHDL and verilog.                 (10 Marks)

3 a. Differentiate between signal and variable assignment statement in VHDL. Write VHDL programs for behavioral description of D-latch using signal signal assignment and variable assignment.                                                                                (10 Marks)
b. Explain the formats of for-loop statements in VHDL and verilog.            (06 Marks)
c. Write verilog description for a 4-bit priority encoder.                    (04 Marks)

4 a. Explain the binding in the following, with example:
       i) Between entity and component in VHDL
      ii) Between two modules in verilog.                                             (10 Marks)
  b. Write the HDL programs for N+1 bit magnitude comparator using
      i) generate and generic in VHDL  ii) generate and parameters in verilog.   (10 Marks)


5 a. Explain the use of procedure (in VHDL) and task (in verilog) with description of full adder, using half adders.                                                                        (10 Marks)
   b. Explain the file declaration and built in procedures for file handling in VHDL.

6 a. How to attach a package to the VHDL module? Explain with example.   (08 Marks)
   b. What is the need of mixed type description? Write description of 16x8 SRAM in VHDL and verilog.                                                                                   (12 Marks)

7 a. How to invoke a VHDL entity from a verilog module? Explain with example. (10)
   b. Write a HDL program for mixed language descriptions of a JK-flip-flop with a clear input.                                                                                                    (10 Marks)

8 a. Write a flow diagram of synthesis. Explain its steps.                  (08 Marks)
   b. Write VHDL code for signal assignment statement y = 2*x + 3. Show the synthesized logic symbol and gate level diagram. Write structural code in verilog using the gate level diagram.                                                                        (12 Marks)  

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