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SOS : 4-bit binary divider circuit PLEASE!!!!!!!

Discussion in 'Electronic Design' started by kpk, Dec 31, 2003.

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  1. kpk

    kpk Guest

    Can anyone send me a 4-bit binary divider circuit in this email :
    ? I must make this homework for my university and i
    am late.
    I have to make this circuit only with NAND gates.

    PLEASE HELP !!!!!!!!!

    Thanks a lot
  2. Sorry,

    I don't mind helping someone with homework if they have made a effort
    and are stuck. I draw the line when the student submits nothing to
    show that he/she has even tried to do the work. The purpose of school
    is not to turn in someone else's work--what do you learn from that? I
    also have to question the utility of assigning such a problem. I
    think the professor is out of touch with reality or is a sadist.
    Also, without considerable research, I cannot design such a counter
    using only NAND gates--not that I would want to.

  3. Jim Thompson

    Jim Thompson Guest

    You can't? Sheeeesh! I'm an analog designer and I can. Ever heard
    of master-slave. Takes 9 2-in-nands (one used as an inverter) to make
    a D-flop.

    ...Jim Thompson
  4. Peter Alfke

    Peter Alfke Guest

    If your homework is too tough,
    and the time just flies away,
    thinking hard is not enough,
    click: comp.arch.fpga.

    There you find those friendly souls,
    Austin, Philip, Peter, Ray
    filling in your knowledge holes,
    making problems go away.

    But learning is for you to do,
    even if it hurts the brain.
    The one that has to learn is you.
    There is no substitute for pain.

    If you want to learn design
    don't treat homework just as play.
    Real life is not benign,
    and you'll have to earn your pay!

    sooner or later...

    Peter Alfke
    (originally posted a few months ago, but bears repeating.)
  5. Peter Alfke

    Peter Alfke Guest

    More constructively,
    your professor wants you to:
    1. realize that you need four cascaded flip-flops,
    2. then "re-invent" the master/slave flip-flop,
    which you can also find in old TTL databooks (7474).

    Maybe an interesting learning experience,
    kind of like the boy-scout test of starting a fire without matches...
    Have fun !

    Peter Alfke
  6. Pete Fraser

    Pete Fraser Guest

    I got thrown out for that.

    Potassium Permanganate and glycerine which spontaneously
    combusts and gets hot enough to light the Magnesium, which
    is hot enough to light the thermite.

    I thought it was impressive.
  7. Mac

    Mac Guest

    Everbody is assuming that this is a clock divider. But it could be an
    arithmetic divider.

    Just thought I'd point that out.

  8. Luhan Monat

    Luhan Monat Guest

    Hey, how about amonium-tri-iodide? 15 molar amonia and iodine crystals.
    Make a slurry but dont let it dry out until you want it to explode.
    (we had a lot of fun painting this stuff in dorm-room locks)
  9. Ben Bradley

    Ben Bradley Guest

    Jim Thompson <> responded to a deperate
    crosspost initiated by (kpk) involving:
    comp.arch.fpga,, and
    comp.lang.verilog thusly:

    An honest request for the answer to a homework assignment - I don't
    think I've ever seen this before!

    He learns, at a low level, how to cheat the system. Of course if
    there's anywhere that the phrase "you're only cheating yourself"
    totally applies, it's in school.

    Perhaps it reinforces the concept that you can build any logic
    device out of a sufficient number of NAND (or NOR) gates?

    That's surely true of some professors, but how can you tell that
    just from what the OP said?

    As Jim said, it's not a big deal at all. Would you rather use
    LM339's? ;)
    I don't know if I'd have the patience to spend three minutes doing
    it when I know I could get a schematic that I could easily convert to
    all-NAND-all-the-time off a (don't tell the OP) "d-a-t-a s-h-e-e-t" in
    less time than that.
    Bonus question(s): How many 74(xxx)00's (quad nand gate) does it
    take to make the 4-bit divider using Jim's solution, and why is "12"
    an incorrect answer?
  10. Brian Inglis

    Brian Inglis Guest

    The establishment doesn't always like creative types -- did you demo
    it or just explain it?
  11. I draw the line when the student submits nothing to
    How to be a manager?

    counter? the OP asked for a multiplier. I could very well imagine
    asking a sketch of a multiplier with an estimate of the amount of
    gates involved. An easy solution would be a total 8->256 decoder
    followed by a 256->5 encoder.

    Wouter van Ooijen

    -- ------------------------------------
    PICmicro chips, programmers, consulting
  12. Tweetldee

    Tweetldee Guest

    Ummm take a look at the subject line of this thread.. the OP asked for a
    4-bit binary divider... 4 R-S flipflops in a chain.. no need for decoders
    (or maybe I missed something in a later post).
    Tweetldee at att dot net (Just subsitute the appropriate characters in the

    Never take a laxative and a sleeping pill at the same time!!
  13. Ummm take a look at the subject line of this thread.. the OP asked for a
    Sorry, I mixed multiply and divide :) But are you sure he meant a
    clock divider? It could also be a binary ALU-style divider.

    Wouter van Ooijen

    -- ------------------------------------
    PICmicro chips, programmers, consulting
  14. DJ

    DJ Guest

    If I were your prof, and I caught you blatantly trying to get others to do your
    thinking for you, I'd make you design it using nothing but BC547's, resistors
    and diodes. That way you might l-e-a-r-n something. That is why you are at uni?

  15. Your university probably has a synthesis tool for asics installed.
    Just write your design in VHDL, remove all gates from the library but
    the NAND gates and press the synthesis button.

    Kolja Sulimma

    Applause for the poem....
  16. Ben Bradley

    Ben Bradley Guest

    In, (Wouter van Ooijen
    But you can do that with nothing but NAND gates, too. ;)
  17. Jerry

    Jerry Guest

    WOW, your prof let you use NANDs? we had to do this using only
    relays. Wish I had an easy prof like yours.


  18. Bob Perlman

    Bob Perlman Guest

    Hah! Luxury! When I was a boy, Professor Babbage made us use gears
    and levers! Compared to that experience, designing with today's EDA
    tools seems...well, pretty much the same, actually.

    Bob Perlman
    Cambrian Design Works
  19. You had gears and levers? We would have given our right arms for gears
    and levers! Cowrie shells was what we had, and were glad for it.

    Best regards,
    Spehro Pefhany
  20. Gag, spit, choke. Damn! Don't *do* that! Now I gotta clean of
    my monitor, again.
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