C192056 Pages:3

(11) Fanin
What is the difference between a latch and a flipflop. (3)
Design an asynchronous 3 bit up counter. Write complete truth table and (8)
excitation table.
PART C

Answer any two full questions, each carries20 marks.
A register is to be designed, which provides all the following functions shift left, (10)
shift right, parallel in, parallel out, serial in, serial out, serial in parallel out and
parallel in serial out. Draw the circuit for a 4 bit data (serial/parallel) and provide

its working.
Draw the Mealy machine for the given table. (10)

Present | Next state, output
state

2020
| Yi Yo |
| 00 (01, 0110, 0

Draw the logic diagram of a Johnson counter. Why it is called a divide by 2N (8)
counter. Draw the neat diagram of clock and output waveforms of a 4 bit Johnson
counter.

Use the state reduction technique and implement the circuit for the given state (12)
diagram.

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