The logic behind flip-flop conversion

Discussion in 'Homework Help' started by ADHD, Jan 18, 2011.

  1. ADHD

    Thread Starter New Member

    Jan 18, 2011
    5
    0
    I got this solved problem in which a D flip-flop is converted into a T flip-flop.

    I know what is a flip flop, i understand basic boolean algebra, but i don't understand the steps necesary to convert a flip flop from one type to another.

    I've attached a picture with the problem answer.
    I don't understand how the data from Q+ and D colums are obtained and why they are the same.

    Thanks
     
  2. haykp

    New Member

    Oct 7, 2010
    18
    0
    Each flop has its output equation. For instance the Dff output equation is like Q+ = D and the T output equation is Q+ = Q'.
    In your solution these equations are just written in table form :)
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    An example of how to read the truth table. On the first row:
    If you have Q=0 and T=0, then you want Q+=0, by definition of the T-FF. But since you are in a D-FF in order to obtain Q+=0 on the output, you have to give it a D=0.

    Is that clear?
     
  4. ADHD

    Thread Starter New Member

    Jan 18, 2011
    5
    0
    I've tried to convert a T into a D, and i think i got it right. ( T = DQ' + D'Q )

    The problem is with the JK flip flop.
    I've tried to convert a T into a JK, but i don't know how to fill the map properly.

    I've tried several approaches but i didn't get the same expression like the ones found on the internet.

    I've attached the table and the map.
     
  5. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    I think that is the one that is not possible. The JK Can be made into anything, but that doesn't mean the T can be made into a JK.

    This has come up a few times before, there is an esoteric solution or two (using more than one FF), but nothing like what you've done in the other conversions above.

    --ETA: My Bad This info is incorrect, it takes a couple gates, but can be done.
     
    Last edited: Jan 18, 2011
  6. ADHD

    Thread Starter New Member

    Jan 18, 2011
    5
    0
    This is what i've found on the web about T to JK.
     
  7. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
Loading...