What is the data size of barrel shifter?

What is the data size of barrel shifter?

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.

Why is barrel shifter included in series path of ALU?

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 barrel shifter?

A barrel shifter is a logic circuit for shifting a word by a varying amount. Its has a control input that specifies the number of bit positions that it shifts by. A barrel shifter is implemented with a sequence of shift multiplexers, each shifting a word by 2k bit positions for different values of k .

What is shifter in ALU?

The scaling shifter is used for prescaling. It has a 16-bit input that is connected to the data bus and a 32-bit output connected to the ALU. It provides a left shift of 0 to 16 bits on the input data. Shifters are also connected to the output of the product register and the accumulator for post-scaling.

What is the role of barrel shifter in programmable DSP?

A barrel shifter is a block of combinational logic that takes an N-bit input value and provides as output the N-bit value shifted left or right by P bits. The great advantage of a barrel shifter is of course speed. It does in a single cycle what it would take P cycles to achieve in GPPs without a barrel shifter.

What is the difference between shifter and barrel shifter?

The Barrel Shifter is similar to the Shift Register (Multi-bit), except that bits shifted of the register are shifted back into the opposite end of the register. For example, in right shift operations, the LSBs shifted out of the register are shifted into the MSBs.

Is barrel shifter a sequential circuit?

Unsourced material may be challenged and removed. 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.

Why do we need barrel shifter?

A barrel shifter is often used to shift and rotate n-bits in modern microprocessors, typically within a single clock cycle. The shifter can cycle the order of the bits ABCD as DABC, CDAB, or BCDA; in this case, no bits are lost.

What are the features of DSP processor?

They provide high-speed data processing by implementing single instruction, multiple data (SIMD) operations, special instructions for superscalar architectures cores, single-cycle MAC or fused multiply–add (FMA) computation, parallel computation in several MAC units, fast data streaming using DMA, circular buffering …

Why is logical shifter circuit in arm called 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.

Which operand is processed by barrel shifter?

The ARM arithmetic logic unit has a 32-bit barrel shifter that is capable of shift and rotate operations. The second operand to many ARM and Thumb data-processing and single register data-transfer instructions can be shifted, before the data-processing or data-transfer is executed, as part of the instruction.