All About Circuits Forum Waveform in SR flip flop
 Register Blogs FAQ Members List Today's Posts Search Today's Posts Mark Forums Read

 Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

#1
10-22-2011, 05:23 AM
 CSharpque Junior Member Join Date: Sep 2011 Posts: 40
Waveform in SR flip flop

hi
how to generate SR waveform from the given output mean q. If Q is given then how to generate S and R . I find Q' but i don't known how to find S and R from the Q and Q'?
#2
10-22-2011, 05:58 AM
 justtrying Senior Member Join Date: Mar 2011 Location: ring of fire, GMT -7 Posts: 324

not sure if i understand the question... but

S and R are inputs of the flip-flop. The levels on those inputs will determine your Q and Q' so if you know Q, you can figure out which inputs on S and R will result in that output. You can work it out through the diagram

also check this out http://www.olemiss.edu/courses/EE/EL...ops/sld002.htm
Attached Images
 SR FF.jpg (40.0 KB, 24 views)
__________________
Nothing is lost if one has the courage to proclaim that all is lost
#3
11-03-2011, 08:23 AM
 CSharpque Junior Member Join Date: Sep 2011 Posts: 40

i have definition
Draw a set of waveform for S and R and X and X' so that the flip flop will have the output signals 0011010 on the output line.

Above is definition now i know output means X so i can draw waveform for X from the X i can also draw X' but how can i draw S and R waveform?
#4
11-03-2011, 04:04 PM
 mangyver5223 Junior Member Join Date: Oct 2011 Posts: 17

Quote:
 Originally Posted by CSharpque i have definition Draw a set of waveform for S and R and X and X' so that the flip flop will have the output signals 0011010 on the output line. Above is definition now i know output means X so i can draw waveform for X from the X i can also draw X' but how can i draw S and R waveform?
I believe if you understand the truth table for SR, hence you know how to done it

S | R | X
0 | 0 | Unchaged
0 | 1 | 0-reset
1 | 0 | 1-set
1 | 1 | Invalid

this was the truth table for SR Flip flop (FF) but no borders XP. So How we can get the answer from it? By looking at the output X at question given and compare with output from truth table , you will get both inputs. Example: output X=1 will get input S=1 and R=0. You got the point? it was as piece of cake, man.

Last edited by mangyver5223; 11-03-2011 at 04:10 PM.
#5
11-04-2011, 06:46 AM
 justtrying Senior Member Join Date: Mar 2011 Location: ring of fire, GMT -7 Posts: 324

or ask yourself a question - what condition do I need to set the flip-flop (X=1)? Looking at the truth table, flip flop is set when S=1 and R=0. What do you need to reset it?
__________________
Nothing is lost if one has the courage to proclaim that all is lost
 The Following User Says Thank You to justtrying For This Useful Post: mangyver5223 (11-04-2011)
#6
11-04-2011, 10:41 AM
 mangyver5223 Junior Member Join Date: Oct 2011 Posts: 17

aha! I got an idea how to remember this SR flip-flop truth table

Imagine S=set while R=reset just like a logic swich

When S=1 while R=0 you will got the logic output 1 (set condition)

when S=0 while R=1 you will get logic output 0 (reset condition)

Hence when you made both S and R equal to logic 1, your SR ff may gone crazy or in other words, prohibited

while both S and R at logic 0, SR ff not change or disturb the current output or in other words unchanged
#7
11-05-2011, 05:48 AM
 CSharpque Junior Member Join Date: Sep 2011 Posts: 40

I have prepare waveform plz check is it write?
#8
11-05-2011, 05:52 AM
 CSharpque Junior Member Join Date: Sep 2011 Posts: 40

I have prepare waveform plz check it.
Attached Files
 SRWaveForm.doc (26.5 KB, 12 views)
#9
11-05-2011, 05:57 AM
 justtrying Senior Member Join Date: Mar 2011 Location: ring of fire, GMT -7 Posts: 324

looks fine. Just double check with SR truth table when uncertain.
__________________
Nothing is lost if one has the courage to proclaim that all is lost
#10
11-05-2011, 06:33 AM
 mangyver5223 Junior Member Join Date: Oct 2011 Posts: 17

Yeah, no problem at all

 Tags flip, flop, waveform

 Related Site Pages Section Title Worksheet Performance-based assessments for digital circuit competencies Worksheet Flip-flop circuits Worksheet Latch circuits Textbook Ring counters : Shift Registers Textbook Parallel-in, parallel-out, universal shift register : Shift Registers Textbook Serial-in/serial-out shift register : Shift Registers Textbook Asynchronous counters : Sequential Circuits Counters Textbook Asynchronous flip-flop inputs : Multivibrators Textbook The J-K flip-flop : Multivibrators Textbook TTL NOR and OR gates : Logic Gates

 Similar Threads Thread Thread Starter Forum Replies Last Post Tobias General Electronics Chat 17 09-29-2011 12:47 PM TripleDeuce Homework Help 5 12-06-2010 10:42 AM Georacer Feedback and Suggestions 17 10-31-2010 04:07 AM th1alb General Electronics Chat 2 12-01-2009 08:00 PM

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Electronics Forums     General Electronics Chat     The Projects Forum     Homework Help     Electronics Resources Software, Microcomputing, and Communications Forums     Programmer's Corner     Embedded Systems and Microcontrollers     Computing and Networks     Radio and Communications Circuits and Projects     The Completed Projects Collection Abstract Forums     Math     Physics     General Science All About Circuits Commmunity Forums     Off-Topic     The Flea Market     Feedback and Suggestions

All times are GMT. The time now is 09:59 PM.