What is Shift Register?

A register adequate for changing its binary data in one or both directions is known as a shift register. The logical design of a shift register includes a series of flip-flops, with the output of one flip-flop linked to the input of the next flip-flop.

Operations of Shift Register

There are various modes of operations of shift registers which are as follows −

Serial-In Serial-Out Shift Register

The controlling of shifting of information decides the ‘serial-in serial-out’ shift register into the right shift and left shift register. The diagram demonstrates a ‘serial-in serial-out’ right shift register.

During the first clock pulse, the signal on the data input is latched in the first flip-flop. During the next clock pulse, the substance of the first flip-flop is saved in the second flip-flop, and the signal which is available at the data input is saved in the first flip-flop, etc. Because the information is recorded one bit at a time, we call it a serial-in shift register. If there is only one output, and data leaves the shift register one bit at a time. It is also referred to as a serial-out shift register.

Serial-In Parallel Out Shift Register

The ‘preset’ and ‘clear’ input commands can be supported to the flip-flops to access a parallel input. The parallel storing of the flip-flop can be synchronous or asynchronous rely upon the design of the shift register. The outputs of each flip-flop make a parallel output.

Parallel In Parallel Out Shift Register

In this register, there is concurrent access of all information bits and the bits occur on parallel outputs concurrently. The following diagram demonstrates a ‘parallel in parallel out’ shift register.

Updated on: 24-Jul-2021

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