Pulse and Digital Circuits

18.3 EXCITATION TABLES

Till now we have seen when the inputs and present state of the flip-flops are known, we can determine the next state to which the flip-flop would go after the occurrence of the clock pulse using the characteristic table. The excitation tables are used to determine the inputs of the flip-flop when the present state and the next state to which the flip-flop goes after the occurrence of the clock pulse are known.

1. Excitation table of an RS flip-flop:The characteristic equation of the RS flip-flop is given by Eqs. (18.1) and (18.2),as Q(t+) = S + QS.R = 0
   • If Q = 0 and Q(t+) = 00 = S + .0Therefore, S has to be 0 and R can be ...