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`define size ((DATA_SIZE/4) * (2 ** (type - 1)))

module bit_reversal

#(

        parameter DATA_SIZE = 32

)

(

        //OUTPUTS

        output [DATA_SIZE - 1 : 0] data_out,

        //INPUTS

        input  [DATA_SIZE - 1 : 0] data_in,

        input  [1 : 0] rev_type

);

//Bit reversing types

localparam NO_REVERSE = 2'b00;

localparam BYTE       = 2'b01;

localparam HALF_WORD  = 2'b10;

localparam WORD       = 2'b11;

localparam TYPES = 4;

wire [DATA_SIZE - 1 : 0] data_reversed[0 : 3];

assign data_reversed[NO_REVERSE] = data_in; //bit order not affected

generate

        genvar i, type;

        for(type = 1 ; type < TYPES; type = type + 1)

                for(i = 0; i < DATA_SIZE; i = i + 1)

                        begin

                                if(i < `size)

                                        assign data_reversed[type][i] = data_in[`size*((i/`size) + 1) - 1 - i];

                                else

                                        assign data_reversed[type][i] = data_in[`size*((i/`size) + 1) - 1 - (i%(`size*(i/`size)))];

                        end

endgenerate

//Output Mux

assign data_out = data_reversed[rev_type];

endmodule