Digital Circuit Design

Discussion in 'Homework Help' started by needroom, Feb 23, 2010.

  1. needroom

    Thread Starter New Member

    Feb 23, 2010
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    nonnnnnnnnnnnn
     
    Last edited: Mar 5, 2010
  2. needroom

    Thread Starter New Member

    Feb 23, 2010
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    Hi Guys, really need your help. I try to figure out what should be use to satisfy the requirement. Counter, Multiplex, adder ?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
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    You can always start with a flowchart to map out the process. The problem has to be broken into steps before you can really begin assembling hardware. This is a link to a free trial - http://www.smartdraw.com/specials/flowchart.asp
     
  4. needroom

    Thread Starter New Member

    Feb 23, 2010
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    anyone could help
     
  5. jlcstrat

    Active Member

    Jun 19, 2009
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    What are the hardware requirements? What are you allowed to use?
     
  6. needroom

    Thread Starter New Member

    Feb 23, 2010
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    any person could throw some light please
     
  7. needroom

    Thread Starter New Member

    Feb 23, 2010
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    any person has any idea please
     
  8. needroom

    Thread Starter New Member

    Feb 23, 2010
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    any help please
     
  9. paone

    New Member

    Dec 12, 2009
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    u can use a 3 to 8 decoder for seven segment display.
    for selecting dip use a2to4 decoder.
    "If the previous selection was ’11’, the price of item ‘10’ is discounted to S$1 and price of item ‘11’ is discounted to S$2." for this use 2 and gates
    one common i/p to 2 and gates (11 i/p).
    other 2 i/ps are from 11 and 10 i/p's to the and gates.

     
  10. beenthere

    Retired Moderator

    Apr 20, 2004
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    Use a latch to hold the selection.

    You could look up the concept of a state machine to help with your design.

    It's about time for you to show us some attempts. From the conditions of use:

    Important


    The Homework Help Forum is not a free homework service; we are here to help your understanding, but fully expect the users of this forum to dictate the course of their own learning.

    When posting a request for homework/coursework/assignment help, you must provide details of your attempts at the questions.
     
  11. beenthere

    Retired Moderator

    Apr 20, 2004
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    You're not using logic elements yet. For instance, how do you signal the logic that there is an input to service? You say "push", but push what?

    Do you have any reference material? You can use 74XX logic, but do you know the functions of the IC's? Can you latch an input into a flip flop?
     
  12. jlcstrat

    Active Member

    Jun 19, 2009
    58
    3
    The answer may be using the mod counter's presets...haven"t thought it all the way through, but it seems there could be a way to check for discount.
     
  13. beenthere

    Retired Moderator

    Apr 20, 2004
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    A worthwhile project would be to draw up a schematic applying the input selection switches to the logic and latching the value into the register.
     
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