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Up counter and Down counter

Mod 4 Up counter

Q0N=Q0'   for every clock 

Q1N  =Q1'   when Q0' :-->0-->1

                                   Q0 :-->1-->0

free running and self starting

 

Mod 4 Down counter

Q0N =Q0,for every clock

Q1N=Q1'

Free running and self starting

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