Connect with us

Logic gate into boolean equation

Discussion in 'Electronic Basics' started by Jibbed, Nov 17, 2003.

Scroll to continue with content
  1. Jibbed

    Jibbed Guest

    Hi,
    Hope this is the right group for this.

    I've made a big circuit in digital works that makes a 7 Segment digital
    display count from 0 to 9. I now have to make the Boolean equations from the
    circuit. One for each segment.

    Here is the first segment (8kb):
    http://www.magic-carpet.freeserve.co.uk/thb/digi_circuit.GIF

    Would it be:
    _ _ _ _ _ _ _ _ _ _
    SEG A = A B C D + A B C D + A B C D

    Or is that total crap?!

    TIA,
    Jon
     
  2. Jon,

    It is not total crap, but it's not correct either. Besides, the negation
    lines do not come through on the right place. Below I use a notation that
    fits better in a typed text.

    SEG A = /(/A * /B * /C * D + /A * B * /C * /D + /A * B * C * /D)

    Re-reading your equation and shifting the negation lines a little bit, I
    guess it's the same that you (want to) write.

    petrus
     
  3. Jibbed

    Jibbed Guest

    Hi peter,
    Thanks! That was what I was looking for! Never seen it written like that but
    it does makes sense to me, sort of confirmed what I'd hoped. I had the
    original
    equation I made from the truth table which had an OR instead of a NOR that I
    changed it to. I was hoping that I could just "NOT" the whole equation which
    it seems like I can do.

    But, I need it written in the form I have it written, which I'm hoping would
    be:

    http://www.magic-carpet.freeserve.co.uk/thb/equation.GIF

    (note the absence of a line immediately above the OR (+). Correct?)

    Anyway you've been lots of help. I just need to get cracking on the rest of
    the segments now!...

    Regards,
    Jon
     
  4.  
  5. Jibbed

    Jibbed Guest

    Phew! Good to hear.

    Thanks,
    Jon


     
  6. Jon,

    It's correct. The way I initially learned to write it, but, as I said, not
    easy to type. Modern logic developing programs tend to use the "!" for the
    NOT, "|" for the OR and "&" for the AND. Learned from the C language. You'll
    met them when you continue to study digital developement.

    Succes,

    petrus
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-