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Numarator (CLS)... si nu prea


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Am dat de urmatoarea problema si pe cuvant ca nu reusesc sa ii dau de cap... http://img7.imageshack.us/img7/5582/imagine005w.jpg

Ce am facut pana acu:

Am scos ecuatiile pt fiecare intrare/iesire din circuit, dupa cum urmeaza:


^LD = ^RCO

^ENP = ^ENT = 0

A = QA; B = QB; C = QC; D = ^QD


Am incercat sa fac un tabel de tranzitie: Astfel ca plecand de la 0001 ajung in starea 1000 (S-a negat QD si s-a facut Q-1 deoarece UP/DN = 0) iar din starea 1000 ajung in starea 0001 (S-a negat QD si s-a facut Q+1 deoarece UP/DN = 1)

Deci dupa logica mea, circuitu asta nu numara nimic...unde gresesc?


Va multumesc,

Cu stima,


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