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Homework Assignments 1 & 2

1.  Seven Segment Display Driver:

  (a)  Write the Truth Tables for any 2 segments of a 7 segment
         display when used to display all the Hex numbers.
  (b)  Transfer the Truth tables to Karnaugh maps and derive a
         minimal Sum of Products expression for each segment.
  (c)  Draw circuit diagrams for the SOP expressions USING ONLY
        NAND GATES.
  (d)  From the original truth tables shown in part (a) derive
         implementations for the two segments using an 8 input
         multiplexor for each segment.
  (e)  Implement both the SOP expressions in (c) and the multiplexor
        circuits in (d) using LogicWorks.
  (f)  Test your circuit by using all 16 possible inputs ( 0 - F ) and
        turn in both the circuits and timing diagrams.  You will find it
        easiest if you use the 4 bit input.

2.  Master-Slave JK Flip-Flop

     Modify the circuit diagram for the Master Slave (MS) JK Flip-flop
     (FF) in Figure A.61 in your text AS CORRECTED IN CLASS to
     incorporate a Preset Input.  Preset is independent of the clocks.
     When Preset is one it causes both Q of the master and Q of the
     slave to be set to 1.  Most FF's also have a CLEAR input, which
     causes both Q of the Master and Q of the slave to go to zero
     when Clear is 1.  Label J, K, Clock, Preset, Qm, Q'm, Qs,
     and Q's.  Use LogicWorks to implement the circuit and verify that all of
     the inputs work correctly.  Submit both the circuit diagram and
     timing diagram produced by LogicWorks.


 
 

 

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