What is Register | SISO Register(Serial-In Serial-Out shift register)|Digital Electronics ||Bangla

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What is a Register?
A register is a storage location for data and instructions in digital electronics. Register in digital electronics are the basic element of a computer, and can hold arbitrary numbers of bits. This can range from one bit to millions of bits. Typically, it stores information for small amounts of time until it is sent on to another device or location.

Registers are commonly found as multiplexers or combination logic circuits, which allow them to take multiple inputs and store them at once. These registers are also used to communicate with other devices or components in the system, allowing them to transfer information quickly and efficiently.

Registers can be used for a variety of purposes, but they all have one thing in common: they hold temporary information that is needed quickly by the card. These include holding values while a calculation is performed, keeping track of an instruction pointer, storing the results of computations, and so on.

What is SISO Shift Register?
The term “SISO” stands for “Serial-In Serial-Out”. The SISO shift register circuit accepts serial data on its input pin and shifts it out serially on its output pin. The number of bits that can be shifted out before the next bit arrives depends on the speed of the clock signal that controls the operation of the shift register. This type of shift register can be used as a buffer between two asynchronous devices that communicate with each other using signals with different frequencies or phases.

The SISO shift register block diagram is shown below which includes 3-D flip-flops. The connection of these FFs can be done by connecting the one Flip Flops output to the next flip flop input. So these FFs are synchronous through each other because the equal CLK signal is applied in each Flip Flop.

This shift register includes simply three connections the SI (serial input), SO (serial output), and CLK (clock signal). Here, the SI determines the input enters into the left-hand side flip-flop, the SO is the output taken from the right-hand side flip-flop & the sequencing CLK signal.

In this type of shift register, the bits can be transmitted serially from the serial input of the flip flop. For each clock signal in the FFs, the data can be transmitted from one phase to the next phase. As a result, we can get the bits in sequence from the D-FFs output which is known as serial output.

Applications
The SISO shift register applications include the following.

The SISO shift register is mainly used to generate time delays in digital logic circuits.
These shift registers are used to transfer manipulation and store the data.
SISO register is used efficiently to decrease the no. of wires connecting the different systems within the design.
SISO shift register delays data through a single CLK time for every stage & they will store a data bit for every register.
These types of registers are mainly used especially for time delays.
Thus, this is all about an overview of the SISO shift register – working with applications. Similarly, the SISO shift register using Jk Flip-Flop can also be designed like using D flip flops but it needs the connection of both the inputs of J & K. Like the above D-FF-based shift register, in the JK FF-based shift register also both the inputs are given at the left side flip flop where all the FFs are serially connected.

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