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  #1  
Old 10-22-2011, 05:23 AM
CSharpque CSharpque is offline
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Default 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'?
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  #2  
Old 10-22-2011, 05:58 AM
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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
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  #3  
Old 11-03-2011, 08:23 AM
CSharpque CSharpque is offline
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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?
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Old 11-03-2011, 04:04 PM
mangyver5223 mangyver5223 is offline
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Quote:
Originally Posted by CSharpque View Post
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.
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Old 11-04-2011, 06:46 AM
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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?
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  #6  
Old 11-04-2011, 10:41 AM
mangyver5223 mangyver5223 is offline
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Lightbulb

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
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  #7  
Old 11-05-2011, 05:48 AM
CSharpque CSharpque is offline
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I have prepare waveform plz check is it write?
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  #8  
Old 11-05-2011, 05:52 AM
CSharpque CSharpque is offline
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I have prepare waveform plz check it.
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  #9  
Old 11-05-2011, 05:57 AM
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looks fine. Just double check with SR truth table when uncertain.
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  #10  
Old 11-05-2011, 06:33 AM
mangyver5223 mangyver5223 is offline
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Yeah, no problem at all
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