Expalin johnson counter, Computer Engineering

Assignment Help:

Write short note on the Johnson counter.

Ans:

 Johnson Counter: It is a synchronous counter, where all flip-flops are clocked concurrently and the clock pulses drive the clock input of all the flip-flops together therefore there is no propagation delay. Fig.(a) demonstrates the circuit of Johnson counter. In case of the  D  input  of  FF0  is  driven  by  Q‾ output  of  FF3, that is, the complement of the output of the final flip flop is fed to the D of FF0. Feedback of this arrangement generates the sequence of states illustrated in Table no.1. The 4 bit sequence has a total of 8 states (there is n bit sequence will have 2n states). Therefore an n bit Johnson counter will have a modulus of 2n.

The Q output of all stage feeds the D input of next stage. Although the Q‾ output of the final stage feeds the D input of primary stage. The counter fills up along with 1's from left to right and after that fills up 0s again as demonstrated in Table no.2. Fig. (b) Demonstrates the wave shapes/timing diagram of 4 bit Johnson counter.

563_Logic Diagram of Johnson counter.png

Fig.(a) Logic Diagram of Johnson counter

Clock Pulse

Q0

Q1

Q2

Q3

0

0

0

0

0

1

1

0

0

0

2

1

1

0

0

3

1

1

1

0

4

1

1

1

1

5

0

1

1

1

6

0

0

1

1

7

0

0

0

1

Table no.1 Sequence of states of 4 bit Johnson Counter

2108_Timing Diagram of 4-bit Johnson Counter.png

Fig.(b) Timing Diagram of 4-bit Johnson Counter


Related Discussions:- Expalin johnson counter

Web technology, Write short notes on Event Model.

Write short notes on Event Model.

Recent parallel programming models, A model for parallel programming is an ...

A model for parallel programming is an abstraction and is machine architecture independent. A model can be executed on several hardware and memory architectures. There are various

Calculate switching capacity in a two stage network, In a two stage network...

In a two stage network there are 512 inlets and outlets, r=s=24. If the probability that a given inlet is active is 0.8, calculate: Switching capacity Given: N =M =512, α

A luminous jewel game, a luminous jewel game c programming start with t and...

a luminous jewel game c programming start with t and end with t the output will yes or no

Spmd model for programming, Q. SPMD model for programming? A normal ass...

Q. SPMD model for programming? A normal assumption was that it must be possible and not too hard to capture the SPMD model for programming MIMD computers in data parallel langu

Ellipse follows the perimeter of the window, A) Execute a program where an ...

A) Execute a program where an ellipse follows the perimeter of the window. B)  Execute a program that can draw graphs, possibly following your plan from last week. Have it graph

What are the general security issues, What are the General Security Issues ...

What are the General Security Issues Many issues exist when linking a computer system to the Internet or indeed to an external link via a network set up. There are numerous way

Compare memory mapped i/o with i/o mapped i/o, Compare memory mapped I/O wi...

Compare memory mapped I/O with I/O mapped I/O. Memory Mapped I/O Scheme: In this scheme there is only one address space. Address space is stated as all possible addresses tha

Explain the multiple bus organization structure, Explain the multiple bus o...

Explain the multiple bus organization structure with neat diagram. The multiple bus organization is using more buses instead of one bus to decrease the number of steps needed an

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd