Question

Hey i have a project due, and for the life of me i cannot figure out how to do this with the restrictions that are put in place, shiftwise operators such as << and >> <<<< >>>> cannot be used

This is the question that follows:

Shifter
Implement a 32-bit shifter. Input: x (32 bits), c (5 bits), and op (2 bits). Output: y. This shifter should shift the input number x by c bits according to the shift operations indicated by op:
op = 0 left logical shift,
op = 1 right logical shift,
3
op = 2 right arithmetic shift, and
op = 3 left circular shift.
For example, if x=0x80000001 and c=4, the value of y should be 0x00000010 if op=0, 0x08000000 if op=1, 0xF8000000 if op=2, and 0x00000018 if op=3. Notice that you cannot use shift operators in Verilog (including <<, <<<, >>, and >>>) directly in this module.

This is the beginning of the code

//32-bit shifter
//To get all scores, you cannot use shift operators in this module.
module shifter(input [31:0] x,
input [4:0] c,
input [1:0] op,
output reg [31:0] y);
//write your code here
always @(op or x)

Answer 1

Hi,

In this verilog module based on your input I have used the concatenation operator {}.

By using this and based on the op input in module I have implemented the shifting operations, and here I have used a temp reg for internal operation, at the end I have assigned it to the final output y