What is barrel shifter Verilog?

A barrel shifter is a combinational logic circuit which shifts the bits of a value in a given direction. So, if we have a 4-bit barrel shifter that shifts right, we can shift left by one place by shifting right three places (3 = 4-1).

How many bits can a barrel shifter take?

The basic operation of the desired barrel shifter is based on logarithmic shifter architecture as described in [1, p. 596] with additional right shift and rotate capabilities [10]. It can shift/ rotate 16-bit input data from 0 to 15 bits to the left/right, and send the result to the output.

What is inline barrel shifter?

A barrel shifter is a digital circuit that can shift a data word by a specified number of bits without the use of any sequential logic, only pure combinational logic, i.e. it inherently provides a binary operation. The shifter can cycle the order of the bits ABCD as DABC, CDAB, or BCDA; in this case, no bits are lost.

How do you implement barrel shifter in Verilog?

Verilog Code for the 8-bit Logical Left Shift Barrel Shifter (barrelShifter.v)

module barrelShifter( Ip,
Op,
shift_mag.
);
input [7:0] Ip; //The 8-bit Input line.
output [7:0] Op; //The 8-bit Output line.
input [2:0] shift_mag; //The 3-bit shift magnitude selection Input.
wire [7:0] ST1,ST2; //Two 8-bit intermediate lines.

What is the advantage of barrel shifter?

A barrel shifter is able to complete the shift in a single clock cycle, giving it a great advantage over a simple shifter which can shift n bits in n clock cycles. It is used in conjunction with a processor’s arithmetic logic unit (ALU) or otherwise embedded in the ALU itself.

What is a logarithmic shifter?

11 (a), Logarithmic shifter is based on 3:1 MUX cells, consisted of 4 stages with the order of 1-bit, 2-bit, 4-bit and 8-bit shift. It can perform the following operations: shift right logical, shift right arithmetic with sign extension, shift left logical and shift left arithmetic.

How does a 4-bit shift register work?

These 4-bit registers feature parallel inputs, parallel outputs, J-K serial inputs, shift/load control input, and a direct overriding clear. The registers have two modes of operation: parallel (broadside) load, and shift (in the direction QA and QD).

How many multiplexers will be required for designing a 8-bit barrel shifter?

An eight- bit barrel shifter is built out of eight flip-flops and eight 8- to-1 multiplexers; a 8-bit barrel shifter requires 8 registers and thirty-two, 8-to-1 multiplexers, and so on. A schematic representation of an 8-bit barrel shifter is shown in Figure 3.

What is the advantage of barrel shifter demonstrate with an example?

Data shifting is required for various low-level data applications such as floating-point arithmetic operations, bit indexing and variable-length coding. A barrel shifter is able to complete the shift in a single clock cycle, giving it a great advantage over a simple shifter which can shift n bits in n clock cycles.