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1 Question Paper Code : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Third Semester Computer Science and Engineering CS 2202/CS 34/EC 1206 A/10144 CS 303/ DIGITAL PRINCIPLES AND SYSTEM DESIGN (Common to Information Technology) (Regulation 2008/2010) (Common to PTCS 2202 Digital Principles and System Design for B.E. (Part-Time) Second Semester CSE Regulation 2009) Time : Three hours Maximum: 100 marks Answer ALL questions. PART A (10 x 2 = 20 marks) 1. Convert ( )2 to base 16 and ( )8 to base Realize XOR gate using only 4 NAND gates. 3. Implement F = XY Z + Y Z +X Z using AOl logic. 4. Obtain the truth table for BCD to Excess-3 code converter. 5. Draw the truth table and circuit thagram of 4 to 2 encoder. 6. Distinguish EEPROM and flash memory. 7. Realize a JK ffip-flop using D ffip-flop be and gates. 8. Write the HDL code for up-down counter using behavioral model. 9. Distinguish fundamental mode circuit and pulse mode circuit. 10. Define primitive flow table. PART B (5 x 16 = 80 marks) 11. (a) Simplify the following Boolean function using Quine-McClusky method F = (A, B, C, D, E)= m (0, 1, 3, 7, 13, 14, 21, 26, 8)+ d (2, 5, 9, 11, 17, 24). (16) (b) (i) Simplify the given Boolean function in POS form using K-map and draw the logic diagram using only NOR gates. F(A, B, C,D)= m (0,1, 4,7,8,10,12, 15)+ d (2, 6,11,14). (10) (ii) Convert into binary. (3) (iii) Find the dual and complement of the following Boolean expression. xyz +x yz+z(xy+w). (3). 12. (a) Design a combinational circuit to perform BCD addition. (16) (b) (i) Design a - 4-bit- -magnitude comparator with three outputs: A>B,A=B&A<B (12) (ii) Construct a 4-bit odd parity generator circuit using gates. (4) 13. (a) (1) Realize 4 x 16 decoder using two 3 x 8 decoders with enable input. (4) (ii) Implement the two following Boolean functions using 8 x 2 PROM. Fl = m (3, 5, 6, 7) and F2 = m (1, 2, 3, 4). (6)

2 (iii) Implement the following function using a multiplexer. F(W, X, Y, Z)= m (0, 1, 3, 4, 8, 9, 15). (6) (b) Implement the following two Boolean functions using PLA with 3 inputs, 4 product terms and 2 outputs. Fl = m (3, 5,6, 7) and F2 = m (1, 2, 3, 4). (16) 14. (a) Design a synchronous counter with the following sequence: 0,1,3,7,6,4 and repeats. Use JK ffip-flops. (16) (b) Design the sequential circuit specified by the following state diagram using T ffip-flops (16) 15. (a) (i) What is the objective of state assignment in asynchronous circuit? Explain racefree state assignment with an example (8) (ii) Discuss about static, dynamic and essential hazards in asynchronous sequential circuits (8) (b) Design an asynchronous sequential circuit with inputs xl and x2 and one output z. Initially and at any time if both the inputs are 0, output is equal to 0. When xl or x2 becomes 1, z becomes 1. When second input also becomes 1, z = 0; The output stays at 0 until circuit goes back to initial state... (16)

3 Question Paper Code : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Third Semester Computer Science and Engineering CS 2202/CS 34/EC 1206 A/10144 CS 303/ DIGITAL PRINCIPLES AND SYSTEM DESIGN (Common to Information Technology) (Regulation 2008/2010) (Common to PTCS 2202 Digital Principles and System Design for B.E. (Part-Time) Second Semester CSE Regulation 2009) Time : Three hours Maximum: 100 marks Answer ALL questions. PART A (10 x 2 = 20 marks) 1. Convert ( )2 to base 16 and ( )8 to base Realize XOR gate using only 4 NAND gates. 3. Implement F = XY Z + Y Z +X Z using AOl logic. 4. Obtain the truth table for BCD to Excess-3 code converter. 5. Draw the truth table and circuit thagram of 4 to 2 encoder. 6. Distinguish EEPROM and flash memory. 7. Realize a JK ffip-flop using D ffip-flop be and gates. 8. Write the HDL code for up-down counter using behavioral model. 9. Distinguish fundamental mode circuit and pulse mode circuit. 10. Define primitive flow table. PART B (5 x 16 = 80 marks) 11. (a) Simplify the following Boolean function using Quine-McClusky method F = (A, B, C, D, E)= m (0, 1, 3, 7, 13, 14, 21, 26, 8)+ d (2, 5, 9, 11, 17, 24). (16) (b) (i) Simplify the given Boolean function in POS form using K-map and draw the logic diagram using only NOR gates. F(A, B, C,D)= m (0,1, 4,7,8,10,12, 15)+ d (2, 6,11,14). (10) (ii) Convert into binary. (3) (iii) Find the dual and complement of the following Boolean expression. xyz +x yz+z(xy+w). (3). 12. (a) Design a combinational circuit to perform BCD addition. (16) (b) (i) Design a - 4-bit- -magnitude comparator with three outputs: A>B,A=B&A<B (12) (ii) Construct a 4-bit odd parity generator circuit using gates. (4) 13. (a) (1) Realize 4 x 16 decoder using two 3 x 8 decoders with enable input. (4) (ii) Implement the two following Boolean functions using 8 x 2 PROM. Fl = m (3, 5, 6, 7) and F2 = m (1, 2, 3, 4). (6)

4 (iii) Implement the following function using a multiplexer. F(W, X, Y, Z)= m (0, 1, 3, 4, 8, 9, 15). (6) (b) Implement the following two Boolean functions using PLA with 3 inputs, 4 product terms and 2 outputs. Fl = m (3, 5,6, 7) and F2 = m (1, 2, 3, 4). (16) 14. (a) Design a synchronous counter with the following sequence: 0,1,3,7,6,4 and repeats. Use JK ffip-flops. (16) (b) Design the sequential circuit specified by the following state diagram using T ffip-flops (16) 15. (a) (i) What is the objective of state assignment in asynchronous circuit? Explain racefree state assignment with an example (8) (ii) Discuss about static, dynamic and essential hazards in asynchronous sequential circuits (8) (b) Design an asynchronous sequential circuit with inputs xl and x2 and one output z. Initially and at any time if both the inputs are 0, output is equal to 0. When xl or x2 becomes 1, z becomes 1. When second input also becomes 1, z = 0; The output stays at 0 until circuit goes back to initial state... (16)

5 Reg. No. : Question Paper Code : T3027 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009 Third Semester Computer Science and Engineering CS 2202 DIGITAL PRINCIPLES AND SYSTEMS DESIGN (Common to Information Technology) (Regulation 2008) Time : Three hours Maximum : 100 Marks Answer ALL Questions PART A (10 2 = 20 Marks) 1. Draw the logic diagram for the Boolean expression NAND gates. ((A + B) C) D using 2. Perform subtraction using 1 s complement (11010)2 (10000)2. 3. Perform 9 s and 10 s compliment subtraction between 18 and Draw the logic diagram for half adder. 5. What is the difference between decoder and demultiplexer? 6. What is programmable logic array? How does it differ from ROM? 7. Write down the difference between sequential and combinational circuits. 8. What is race around condition? 9. What is meant by lockout condition? 10. What are the steps for design of asynchronous sequential circuit?

6 PART B (5 16 = 80 Marks) 11. (a) Simplify the following Boolean expression using Quine method : McCluskey F = m (0, 9, 15, 24, 29, 30) + d (8, 11, 31). (16) (b) (i) Implement Boolean expression for EXOR gate using NAND and NOR gates. (8) (ii) Prove that ( AB + C + D )(C + D )(C + D + E ) = ABC + D. (4) (iii) Using 2 s complement perform (42)10 (68)10. (4) 12. (a) (i) Explain the gray code to binary converter with the necessary diagram. (10) (ii) Design a half subtractor circuit. (6) (b) With neat diagram explain BCD subtractor using 9 s and 10 s complement method. (16) 13. (a) Explain with necessary diagram a BCD to 7 segment display decoder. (16) (b) (i) Write the comparison between PROM, PLA, PAL. (6) (ii) Design a BCD to excess-3 code converter and implement using PLA. (10) 14. (a) Design and implement a Mod-5 synchronous counter using JK flip-flop. Draw the timing diagram also. (16) (b) (i) Explain the working of master slave JK flip-flop. (10) (ii) Draw the diagram for a 3 bit ripple counter. (6) 2 T 3027

7 15. (a) (i) Design a comparator. (6) (ii) Design a non sequential ripple counter which will go through the states 3, 4, 5, 7, 8, 9, 10, 3, 4... draw bush diagram also. (10) (b) (i) Design a parity checker. (6) (ii) Design a sequential circuit with JK flip-flop. (10) T 3027

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27 Reg. No. : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Time : Three hours Question Paper Code : Third Semester Computer Science and Engineering CS 2202 DIGITAL PRINCIPLES AND SYSTEMS DESIGN (Common to Information Technology) (Regulation 2008) Answer ALL questions. PART A (10 2 = 20 marks) 1. Perform the following code conversions: ( ) 16 (?) 2 (?) 8 (?) 10 Maximum : 100 marks 2. State the different ways for representing the signed binary numbers. 3. With block diagram show how a full adder can be designed by using two half adders and one OR gate. 4. List the modeling techniques available in HDL. 5. Define decoder. Draw the block diagram and truth table for 2 to 4 decoder. 6. What is the difference between Programmable array logic (PAL) and Programmable logic array (PLA)? 7. How many flip flops are required for designing synchronous MOD60 counter? 8. Write down the characteristic equation for JK and T flip flops. 9. What is meant by Race condition in Asynchronous sequential circuit? 10. Define Hazard. List the Hazards in combinational circuit.

28 PART B (5 16 = 80 marks) 11. (a) Simplify the following Boolean function F using Karnaugh map method: (b) (i) F(A, B, C, D)= (1,4,5,6,12,14,15) (4) (ii) F(A, B, C, D) = (0,1,2,4,5,7,11,15) (4) (iii) F(A, B, C, D) = (2,3,10,11,12,13,14,15) (4) (iv) F(A, B, C, D) = (0,2,4,5,6,7,8,10,13,15) (4) simplify the following Boolean expressions to a minimum number of literals: (i) (ii) (iii) (iv) (v) AC + ABC + AC (2) XYZ + XY + XYZ (2) XY + YZ + XYZ (2) AB + ABD + ABD + ACD + ABC (5) BD + BCD + ABCD (5) 12. (a) Consider the combinational circuit shown in Figure 1. (i) Derive the Boolean expressions for T1 through T 4. Evaluate the outputs F 1 and F 2 as a function of the four inputs. (4) (ii) List the truth table with 16 binary combinations of the four input variables. Then list the binary values for T 1 through T 4 and outputs F 1 and F 2 in the table. (4 (iii) Plot the output Boolean function obtained in part (ii) on maps and show that simplified Boolean expressions are equivalent to the ones obtained in Part (i) (8) Figure 1. (b) (i) With suitable block diagram explain Binary multiplier. (8) (ii) Write a detailed note on carry propagation. (8)

29 13. (a) Construct a 5 to 32 line decoder with four 3 to 8 line decoders with enable and a 2 to 4 line decoder. Use block diagrams for components.(16) (b) (i) Implement the following Boolean function with 16 1 multiplexer : F ( A, B, C, D ) = (0, 1, 3, 4, 8, 9,15), Use block diagram representation. (6) (ii) Write HDL gate level description for 3 to 8 line decoder. (4) (iii) With suitable timing diagram explain how Read operation is performed in Random access memory. (6) [6 14. (a) Design a MOD 16 up counter using JK Flip flops. (16) [1 (b) With suitable example explain state reduction and state assignment.(16) 15. (a) Write a detailed note on Race free state assignment. (16) [1 (b) With suitable design example, explain ASM Chart. (16)

30 Reg. No. : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Common to B.E./B.Tech. Computer Science and Engineering/Information Time : Three hours Technology Third Semester DIGITAL PRINCIPLES AND SYSTEMS DESIGN (Regulation 2010) Answer ALL questions. PART A (10 2 = 20 marks) 1. Simplify the expression ((AB + ABC) + A (B + AB )). 2. Find the minimum expression of Y = Π (0, 1, 3, 5, 6, 7, 10, 14,15). Question Paper Code : Draw the full adder circuit as a collection of two half adder. Maximum : 100 marks 4. A circuit is to be designed that has one control line and three data lines. When the control line is high, the circuit is to detect when one of the data lines has a 1 on it. No more than one data line will ever have a 1 on it. When the control line is low, the circuit will output a 0, regardless of what is on the data lines. 5. The input frequency of a 7497 binary rate multiplier is 64 K Hz. What will its output be if the multiplier word is 1011? 6. Implement a digital circuit that statistics the following : F (A, B, C) = Σ (0, 2, 3, 4, 7), d (A, B, C) = (1)

31 7. Given a 8 bit data word , generate the 13 bit composite word for the Hamming code that corrects single errors and detects double errors. 8. Draw a 4- bit binary synchronous counter with D flip flops. 9. Draw a circuit that has no static hazards and implement the boolean function F (A, B, C, D) = Σ (0,2,6, 7, 8, 10, 12) 10. Find a critical race free state assignment for the reduced flow table shown. PART B (5 16 = 80 marks) 11. (a) Reduce the expression using Quine McCluskey method. F x, x, x, x x = Σ (0, 2, 4, 5, 6, 7, 8, 10, 14, l7, l8, 21, 29, 31) + (b) ( ) m , 5 Σ d (11, 20, 22). (16) Explain the conversion of regular expression into canonical expression and their simplification in SOP and POS forms. (16) 12. (a) Design a combinational circuit that multiplies by 5 an input decimal digit represented in BCD. The output is also in BCD. Show that the outputs can be obtained from the input lines without using any logic gates. (16) (b) A circuit receives only valid 5211 or 8421 BCD information and provides two output lines X and Y. Design the circuit such that X will provide an output anytime a valid 8421 BCD code appears at the input and Y will provide an output anytime a valid 5211 BCD code appears at the input. (16)

32 13. (a) Implement the following Boolean function with a 4 X 1 multiplexer and external gates. Connect inputs A and B to the selection lines. The input requirements for the four data lines will be a function of variables C and D. these values are obtained by expressing F as a function of C and D for each of the four cases when AB=00, 01, 10 and 11. These functions may have to be implemented with external gates. (b) F(A,B,C,D)= Σ (1,3,4, 11, 12, 13, 14, 15) Design a combinational circuit that compares two 4 bit numbers A and B to check if they are equal. The circuit has three output x, y, z so that x =1 if A = B and y = 1 if A < B and z = 1 if A > B. 14. (a) (i) Reduce the number of states in the state table and tabulate the reduced state table. (8) Present state Next state Output (b) (ii) X = 0 X = l X = 0 X = 1 a f b 0 0 b d c 0 0 c f e 0 0 d g a 1 0 e d c 0 0 f f b 1 1 g g h 0 1 h g a 1 0 Starting from state a of the state table, find the output sequence generated with an input sequence (8) Design the following non binary sequence counters as specified in each case. Treat the unused states as don t care conditions. Analyze the final circuit to ensure that it is self correcting. If your design produces a non self correcting counter, modify the circuit to make itself correcting. (i) Design a counter with the following repeated binary sequence: 0,1, 2, 3, 4, 5, 6. Use JK flipflops. (6) (ii) Design a counter with the following repeated binary sequence: 0,1, 2, 4, 6. Use D flipflops. (5) (iii) Design a counter with the following repeated binary sequence: 0,1, 3, 5, 7. Use T flipflops. (5)

33 15. (a) A traffic light is installed at a junction of railroad and road. The traffic light is controlled by two switches in the rails placed one mile apart on either side of the junction. A switch is turned on when the train is over it and is turned off otherwise. The train light changes from green (logic -0) to red (logic - 1) when the beginning of the train is one mile from the junction. The light changes back to green when the end of the train is one mile away from the junction. Assume that the length of the train is less than two miles. (b) (i) Obtain the primitive flow table for the circuit. (ii) Show that the flow table can be reduced to four rows. (16) An asynchronous sequential circuit is described by the following excitation and output functions Y = x1 x2' + ( x1 + x2' ) y Z = y (i) (ii) Draw the logic diagram of the circuit. Derive the transition table and output map. (iii) Obtain 2 state flow table. (iv) Describe in words the behavior of the circuit. (16)

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