Show how to make the shift register of Figure 12-10

Chapter 12, Problem 12.41

(choose chapter or problem)

Show how to make the shift register of Figure 12-10 reverse the order of its bits (i.e., \(Q_{3}^{+}=Q_{0}\), \(Q_{2}^{+}=Q_{1}\), \(Q_{1}^{+}=Q_{2}\), and \(Q_{0}^{+}=Q_{3}\)).

(a) Use external connections between the Q outputs and the D inputs. What should the values of Sh and L be for a reversal?

(b) Change the internal circuitry to allow bit reversal, so that the D inputs may be used for other purposes. Replace Sh and L with A and B, and let the register operate according to the following table:

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