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Posted Date: 14 Dec 2010      Posted By:: k.kamalakannan    Member Level: Silver  Points: 5 (Rs. 1)

2010 Anna University Chennai B.E Computer Science and Engineering Cs2202 - digital principles and system design Question paper

Course: B.E Computer Science and Engineering   University/board: Anna University Chennai

Third Semester
Computer Science and Engineering
(Common to Information Technology)
(Regulation 2008)
Time: Three hours Maximum : 100 Marks
Answer ALL questions
PART A - (10 X 2 = 20 Marks)
1. Find the octal equivalent of hexadecimal number AB.CD.
2. State and prove the consensus theorem.
3. Compare the serial and parallel adder.
4. Define look ahead carry addition.
5. Define priority encoder.
6. Write a dataflow description of a 2-to-1 line Mux using a conditional operator.
7. Differentiate Moore and Mealy circuit models.
8. What are the applications of shift registers?
9. What is meant by critical race?
10. What are the types of hazards?

PART B-(5 X 16 = 80 Marks)

11. (a) Simplify the following 5 variable Boolean expression using McCluskey method.
F=Em(0,1,9,15,24,29,30) + d(8,11,31). (16 Marks)
(b) Determine the minterm sum of product form of the switching function.
F= E(0,1,4,5,6,11,14,15,16,17,20,22,30,32,33,36,37,48,49,52,53,59,63). (16 Marks)

12. (a) Relative a BCD to Excess-3 code conversion circuit starting from its truth table. (16 Marks)
(b) Design a full adder and subtractor using NAND and NOR gates respectively. (16 Marks)

13. (a) (i) Define multiplexer.
(ii) Implement the following boolean function using 8:1 MUX.
F(A,B,C,D) = -AB-D + ACD + -BCD + -A-CD (16 Marks)
(b) Implement the switching functions
z1= a-b-d-e + -a-b-c-d-e + bc + de
z2= -a-ce
z3= bc + de + -c-d-e + bd
z4= -a-ce + ce using a 5X8X4 programmable logic array. (16 Marks)

14. (a) Design a clocked sequential machine using T flip flops for the following state diagram. Use state reduction if possible. Also use straight binary state assignment. (16 Marks)
(b) Using RS- FFs design a parallel counter which counts in the sequence 000,111,101,110,001,010,000,.... (16 Marks)

15. (a) Design a T flip flop from logic gates. (16 Marks)
(b) Find a static and dynamic hazard free realization for the following function using
(i) NAND gates.
(ii) NOR gates. f(a,b,c,d) = Em (1,5,7,14,15) (16 Marks)

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