Illustration to demonstrate design of sequential circuits, Computer Engineering

Assignment Help:

Q. Illustration to demonstrate design of sequential circuits?

Let us take an illustration to demonstrate above process. Suppose we want to design 2-bit binary counter employing D flip-flop. Circuit goes through repeated binary states 00, 01, 10 and 11 whenever external input X = 1 is applied. State of circuit won't change when X = 0. State table and state diagram for this is displayed in figure. Although how do we make the state diagram? Please note number of flip-flops- 2 in our illustration as we are designing 2 bits counter. Different states of two bit input will be 00 01 10 and 11.  These are displayed in circle. The arrow denotes transitions on an input value X.  For illustration when counter is in state 00 and input value X=0 happens counter remains in 00 state.  Therefore loop back on X= 0.  But on encountering X=1 counter moves to state 01.  Similarly in all other states similar transition happen.  For making state table consider excitation table of D flip-flop given in figure (c).

Present state of two flip-flops and subsequent states of flip-flops are put into the table with any input value.  For illustration if present state of flip-flops is 01 and input value is 1 then counter will move to state 10.  Notice these values in fourth row of values in state table (figure (a) Or we can write as below:

582_Illustration to demonstrate design of sequential circuits.png

This denotes flip-flop A has moved from state clear to set. As we are constructing the counter using D flip-flop the main question is what would be input DA value of A flip-flop which allows this transition which  is Q(t) = 0 to Q(t+1) =1 possible for A flip flop.  On checking excitation table for D Flip-flop we find value of D input of a flip-flop (known as DA in this illustration) would be 1.  Similarly B flip-flop have a transition Q(t) = 1 to Q(t+1)=0 so DB, would be 0.  Therefore notice the values of flip-flop inputs DA and DB. (Row 3).


Related Discussions:- Illustration to demonstrate design of sequential circuits

Fundamental change to the cloud to support mobility, Question: The abun...

Question: The abundance of resources and the ease of access to cloud computing can help to bridge the gap the resource gap for mobile computing. Nevertheless some fundamental c

Determine less propagation delay in synchronous-ripple ckt, You have two co...

You have two counters counting up to 16, built through negedge DFF, First circuit is synchronous and second is "ripple" as cascading, which circuit has a less propagation delay? Wh

Determine frame time and propagation time in a lan, Maximum channel utiliza...

Maximum channel utilization in a LAN is defined by frame time (t f ) and propagation time (t p ). It is defined by (A) t p /t f (B) t f /t p  (C) 1 + (t f /t p )

In order to concatenate strings only for output purposes, In order to conca...

In order to concatenate strings only for output purposes which command can be used in conjunction with the 'Write' statement. NO-GAP command.

Instruction pipelines, Instruction Pipelines As discussed previous, the...

Instruction Pipelines As discussed previous, the stream of instructions in the instruction implementation cycle, can be realized through a pipeline where overlapped implementat

What are different normalization forms, What are different normalization fo...

What are different normalization forms? 1NF: Eliminate Repeating Groups Make a separate table for every set of related attributes, and give each table a primary key. Each fie

Determine the term- security, Determine the term- Security When using ...

Determine the term- Security When using Internet, security can be enhanced using encryption. Debit and credit card transactions can also be protected by a specific type of pas

What is java applet, A Applet is a java program that runs within a web brow...

A Applet is a java program that runs within a web browser.

Explain about batch system, Q. Explain about Batch System? A number...

Q. Explain about Batch System? A number of computer systems only did one thing at a time. They had a list of computer system can be dedicated to a single program till its c

Define bidirectional bus, Define bidirectional bus? A bidirectional bus...

Define bidirectional bus? A bidirectional bus is that which permits the transfer of data either from memory to CPU during a read operation or from CPU to memory during write op

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