Explain the Bidirectional Shift Registers?

A Reversible or A Bidirectional shift register is one in which the data can be shift either left or right. D flip-flops are used by a four-bit Bidirectional shift register that is shown below.

At this point a set of NAND gates are configured as OR gates to select data inputs from the left or right adjacent bistables as selected by the LEFT/RIGHT control line.

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