Using four registers, design a circuit that stores the four values present at an 8-bit input D during the previous four clock cycles. The circuit should have a single 8-bit output that can be configured using two inputs s1 and s0 to output any one of the four registers

Shift Registers are used for data storage or for the movement of data and are therefore commonly used inside calculators or computers to store data such as two binary numbers before they are added together, or to convert the data from either a serial to parallel or parallel to serial format. The individual data latches that make up a single shift register are all driven by a common clock ( Clk ) signal making them synchronous devices.

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