| DIGITAL SYSTEM DESIGN |
| PAPER NO. 2 |
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| PUT ON: Dec,2002 |
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EC-404 DIGITAL SYSTEM DESIGN (B.Tech 8th Semester, 2052) Time : 3 Hours Maximum Marks : 60 NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from Section B and any two questions from Section C Section-A Marks : 20 1(a) Minimize the expression :  (b) Define State Diagram. (c) List the operation modes of Shift Registers. (d) What is a detailed flow diagram ? (e) Which criteria must be adhered to in order to design reliable and well behaved sequential machines ? (f) What is a ROM ? (g) List some applications of PLAs. (h) Give some basic desirable features of a programmable controller. (i) What are the features of a asynchronous sequential machine ? (j) Explain the term overloading. Section-B Marks:5 Each 2. Minimize F1 and F2 using VEM technique. A B C D | F1 F2 -------------------------------------------------- 0 0 0 0 | Φ 0 0 0 0 1 | Φ 0 -------------------------------------------------- 0 0 1 0 | 1 1 0 0 1 1 | 0 1 -------------------------------------------------- 0 1 0 0 | 1 0 0 1 0 1 | 1 1 -------------------------------------------------- 0 1 1 0 | Φ 1 0 1 1 1 | 0 1 -------------------------------------------------- 1 0 0 0 | 0 0 1 0 0 1 | 0 0 -------------------------------------------------- 1 0 1 0 | 1 Φ 1 0 1 1 | 1 0 -------------------------------------------------- 1 1 0 0 | 0 0 1 1 0 1 | 1 Φ -------------------------------------------------- 1 1 1 0 | 0 1 1 1 1 1 | Φ 0 -------------------------------------------------- 3. Design a three-bit modulo 6, unit distance code up counter. Show only the D flip-flop implemetation. 4. Illustrate the possible fault that can be created by the impropper state assignment to the next states of a state whose branching is controlled by an asynchronous input with the help of an example. 5. Implement the following unsimplified Boolean expression using a ROM or PROM :  6. Explain the applications of the 8 x 02 to system control functions. Section-C Marks : 10 Each 7. Explain the following terms (a) Cycles and Races (b) Hazards. 8. Design a circuit that will function as prescribed by the state diagram given below :  9. Give details of the following terms with reference to VHDL : (a) Structural models (b) Logical operators. |
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