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Elec 2607 Digital Switching Circuits
Lecture 15 & 16: Digital Logic 12/11/2018 ELEC 2607 Lecture 15 & 16:
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ANOTHER FORM OF Digital Logic
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Review the SR Latch in lectures 7 & 8
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For review see lectures 9 & 10
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It is the output from the logic gates
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IS this circuit useful for anything?
What is this circuit? What is this circuit? The point of this slide is where to put the breaks AND NOT the circuits used to illustrate where the breaks should be placed. 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Just like for synchronous FSM
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a+ and b+ will show up on the left side of the X
They will then propagate through the X restoring or changing A, B Think of it as a two step process Feedback to get + Jumping the X This again Stability 12/11/2018 ELEC 2607 Lecture 15 & 16:
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AB Two or more signal race around the feedback loop. The fast signals arrive first. 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Have same time delay as For this slide Gates #1 and #2 Gates #3 and #4
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Return to this starting condition
Change s to 1 #1 #2 Gates #1 and #2 Are faster than Gates #3 and #4 AB #4 #3 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Are faster than For this slide Gates #1 and #2 New 1 Gates #3 and #4
AB AB Old 0 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Return to this starting condition
Change s to 1 #1 #2 Gates #1 and #2 Are slower than Gates #3 and #4 AB #4 #3 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Are slower than For this slide New 1 Old 0 Gates #1 and #2
AB AB 12/11/2018 ELEC 2607 Lecture 15 & 16:
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A GOOD PLACE TO TAKE A BREAK
key Two bit change Gives race condition A GOOD PLACE TO START AGAIN 12/11/2018 ELEC 2607 Lecture 15 & 16:
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What about 3 bit changes or 4 bit changes or …… ?????
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1 Next slide 2 Next - Next slide 12/11/2018 ELEC 2607 Lecture 15 & 16:
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1 1 12/11/2018 ELEC 2607 Lecture 15 & 16:
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2 12/11/2018 ELEC 2607 Lecture 15 & 16:
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011 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Breaking up the next 2 slides into individuals
It is clearer if we make one slide for each step in the process. Will be added in next revision. Now added 12/11/2018 ELEC 2607 Lecture 15 & 16:
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(4) 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Last 4 slides together -----------Summary
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(5) Sketch transitions on a state diagram
(5) Sketch transitions on a state diagram. Try to make transitions horizontal or vertical. (5) 12/11/2018 ELEC 2607 Lecture 15 & 16:
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(6) Get rid of angle jumps
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(7) 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Last 4 slides together -----------Summary
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finale -----------Summary
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Recall lectures 13 & 14 on hazards
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Q 12/11/2018 ELEC 2607 Lecture 15 & 16:
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Google home page on November 2, 2015
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