A recirculating shift register is a shift register that keeps the binary information circulating through the register as clock pulses are applied. The shift register of Figure 5-46 can be made into a circulating register by connecting flip-flop X₀ to the DATA IN line. No external inputs are used. Assume that this circulating register starts out with 1011 stored in it (i.e., X₃ = 1, X₂ = 0, X₁ = 1, and X₀ = 1).

List the sequence of states that the register FFs go through as eight shift pulses are applied.

Figure 5-46

Transcribed Image Text:

DATA IN Shift pulses J CLK K Shift pulses DATA IN 1 0 1 0 1 0 1 1 0 0 X3 X3 J CLK K X₂ X₂ (a) ô CLK K 13 1 X₁ CLK K Xo