Implementation of Sequential Circuits using Flip Flops and Combination Logic Gates

It involves the following steps:

1. Construct the state table from the state diagram of sequential circuit.
2. From the state table, form the state equations using Karnaugh map (k-map).
3. Finally, draw the circuit diagram from these equations

Example

A sequential circuit has three flip-flops A, B, C ; one input x_in ; and one output y_out . The state diagram is shown in Fig. P5.19 . The circuit is to be designed by treating the unused states as don’t-care conditions. Analyze the circuit obtained from the design to determine the effect of the unused states. (a) Use D flip-flops in the design.