Explaintion
▶A Bi-Directional Shift Register can work either as SHIFT RIGHT or SHIFT LEFT register.
▶Circuit of 4-bit bi-directional shift register using D-FFs is shown in Figure.
▶In this SHIFT RIGHT and SHIFT LEFT operation is achieved using the AND & OR gates.
▶When the control is kept on model 1,gates G1 through G4 are enabled. When clock pulse is given,data given on D-Right shifts to right and the circuit works as the shift right register.
▶When the control is kept on model 0,gates G5 through G8 are enabled and data given on D-Left is shifted to the left and the circuit works as the shift left register.
▶It should be remembered that the mode control should be changed only when the clock is zero(0),otherwise the data might be changed.
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