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Advanced Digital System Design 1st Jan12 AP9212

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First semester
(Common to M.E. VLSI Design)
(Regulation 2009)

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PART A—(10 × 2 = 20 marks)

1. Differentiate between state table and excitation table.
2. Draw ASM diagram for a serial adder.
3. What is a merger graph? Give example?
4. Differentiate between dynamic and static hazard.
5. State the conditions for faults to be equivalent and for faults to be redundant.
6. What is the significance of using BIST in Digital circuits?
7. Implement F= ABC’+AB’D’C+A’D using PLA.
8. What is Programmable Interconnect Point?
9. What is blocking and Non-blocking statement in VHDL?
10. What is a package?

PART B—(5 × 16 = 80 marks)

11. (a) (i) Design a Moore type sequence detector to detect a serial input sequence of 1010.
(ii) Design a mod 5 counter. Use JK flip-Flops. (16)
(b) The Message bits are encoded on a single line x, so as to synchronize with a clock. Bits are encoded so that 3 or more consecutive 1’s or 3 more 0’s should never appear on the input line x. An error indicating sequential circuit is to be designed to indicate an error by generating ‘1’ on the output line z, coinciding with the third of everysequence of three zero’s or three ones. Draw the state diagram for the logic circuit using D Flip-flops. (16)

12. (a) Design a circuit with primary inputs A and B to give an output Z equal to 1 when A becomes 1 if B is already 1. Once Z=1 it will remain so until A goes to 0. Draw the Timing diagram, the state diagram, primitive flow table for designing this circuit. (16)
(b) Design a negative edge triggered T flip-Flop. The circuit has two inputs T and C and one output Q. The output state is complemented if T=1 and the clock C changes from 1 to 0. Otherwise, under any other input conditions the output Q remains unchanged.

13. (a) (i) What is a fault? Explain Boolean difference Method of Fault Diagnosis. (8)
(ii) Discuss Compact algorithm. (8)
(b) (i) Discuss the test generation by DFT scheme. (8)
(ii) Explain the path sensitization method. (8)

14. (a)(i) Give the PAL realization of the given function Ω(A, B, C, D, E, F) = Σm(0, 2, 6, 7, 8, 12, 13)
x(A, B, C, D, E, F) = Σm(0, 2, 6, 7, 8, 12, 13, 14)
y(A, B, C, D, E, F) = Σm( 2, 3, 8, 9, 10, 12, 13)
z(A, B, C, D, E, F) = Σm(1, 3, 6, 9,12, 4) (8)
(ii) Design a BCD to express 3 code convertor and implement using suitable PLA.
(b) (i) Draw and explain the block diagram for XILINX FPGA. (8)
F1 (a, b, c) = Σ (0, 1, 3, 4)
F2 (a, b, c) = Σ (1, 2, 3, 4, 5). (8)

15. (a) (i) Explain Behavioral modeling with a suitable example. (8)
(ii) Design a 8 bit parallel Adder using VHDL. (8)
(b) (i) Design an ALU using VHDL. (10)
(ii) Write a test bench to test a 4 bit counter. (6) (ii) Implement the following Boolean functions using 3x 4 x 2 PLA

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