A recirculating shift register is a shift register that keeps the binary information circulating through the register

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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

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 X X (a)  CLK K 13 1 X CLK

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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