Assume you wanted to make the sequential circuit you designed in this experiment

Question

Assume you wanted to make the sequential circuit you designed in this experiment start in state 4 if a reset pushbutton is pressed. If is is possible, describe how you would modify the circuit to incorporate this feature If it is not possible, explain why.

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Step 1: Draw the required state diagram. (Note that only the main sequence is shown as the unused states are not important in this problem.) Main sequeice S, EE320 Digital Systen Draw the next-state table. Four flip-flops are required because of the number of bits used in the sequence Design of Synch 1. Complete the des the maps. Step 2: Present state Next state As a 0 0 I 0 1 00 1 00 1 0 00 1 0 display to show t BCD Jeven in seven-s Step 3: Using the next-state and transition tables, draw the Karnaugh maps for each flip-flop. For example, in state I, note that Op and Qc do not change in going to the next state The transition is 0 ? O. From the transition table, a O +0 transition requires J = 0 and K X These values are entered onto the maps for the D and Ccourters in the square that represents state 1. Unused states are mapped as Xs. Only the D and C maps are shown in this example (Note: Qs and QA are positioned to make the map below easier to read) 3. Assume youv pressed. If it is p why 24 0 8 1 eA ea 0 0 1 I 1 0 0 1 0 0 X 4. Assume you this?

Explanation / Answer

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          Please find the answer attached as under. Please give a thumbs up rating if you find the answer useful! Have a rocking day ahead!

NOTE: i have given an idea of how to go about the design, but have not actually carried out the design procedure. The reason is that the present design uses a 4 variable K map and the proposed design uses a 5 variable K map, which can only be designed using a computer.

With the addition of a reset button, you are introducing an input to the system, which introduces an extra variable. Thus, as a first step, your state diagram will change. now there will be an additional arrow from every state to state S4, with the input "Reset = 1". For "Reset=0", the state diagram will be as before. Now, you will have to incorporate this to your state table. Thus, each of your "Q" variable will now depend on the old "Q" variables plus the reset input. For "Reste=0", the state table will be unchanged and for "Reset=1", the states will all have S4 as the next state. Now, you carry forward this info to a K map and carry out the design.

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