Rotate100

Build a 100-bit left/right rotator, with synchronous load and left/right enable. A rotator shifts-in the shifted-out bit from the other end of the register, unlike a shifter that discards the shifted-out bit and shifts in a zero. If enabled, a rotator rotates the bits around and does not modify/discard them.

• load: Loads shift register with data[99:0] instead of rotating.
• ena[1:0]: Chooses whether and which direction to rotate.
  • 2'b01 rotates right by one bit
  • 2'b10 rotates left by one bit
  • 2'b00 and 2'b11 do not rotate.
• q: The contents of the rotator

module top_module(
    input clk,
    input load,
    input [1:0] ena,
    input [99:0] data,
    output reg [99:0] q); 
    
    always@ (posedge clk)
        if(load)
            q <= data;
    else case(ena)
        2'b01: q <= {q[0], q[99:1]};
        2'b10: q <= {q[98:0], q[99]};
    	default: q <= q;
    endcase
endmodule