Engineering : Vending

Vending Machine: Flow diagramResetNoCoinregistered?YesTotal <1 Total?Total = 1 Total> 1EjectbottleReturn10 CentResetsumDecreasesumIE1204 Digital Design, Autumn201539Vending Machine: State diagram(a)000LT_I_EUROEQ_I_EURODROPREADY(d)DROP 110DROP READYCOIN_PRESENT The state diagramCOIN_PRESENTcontains all informationCOIN_PRESENTrequired to generate an(b)001implementationCOIN_PRESENT Assumption: D flip-flops(c)011are used as stateGT_I_EUROregisterCHANGERREADY(f) 7 states: 3 flip-flops areRETURN_10_CENT100neededCHANGER_READY(e)111(g)101CLR_ACCDEC_ACCIE1204 Digital Design, Autumn2015The state variable order isABC, i.e. state (c) isA = 0, B = 1,C = 140Vending Machine: Logic designNext statedecoder(Combinational circuit)Input-signalsFlip-flopsClkLT_I_EURO?ADDROPEQ_I_EURORETURN_I0_CENTDBGT_I_EURODROP_READYCHANGER_READYAOutput-signals?DACOIN_PRESENTOutputdecoder(Combinational circuit)NextStateDecoderBDCDBOutputDecoderCLR_ACCDEC_ACCDCCClkAt next step, we develop the logic for the next state (DA, DB, DC) and outputsIE1204 Digital Design, Autumn201541Decoder: Next state - DACOIN_PRESENT(a)000DAAB0001111000-1110(=) + (>)00COIN_PRESENTCOIN_PRESENT(b)001CCOIN_PRESENTLT_I_EUROEQ_I_EURO(c)011(=) : EQ_1_EURO(>) : GT_1_EUROGT_I_EURODROPREADY(f)100(d)D ...


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