Subversion Repositories fft2_size

/*

Bit-reversal permutation module

Delay 1 clock

*/

`ifndef _bitrev_

`define _bitrev_

module bitrev #(

        parameter WIDTH = 14, // max data width

        parameter BIT_WIDTH = (2**$clog2(WIDTH) > WIDTH - 1) ? $clog2(WIDTH) : $clog2(WIDTH) + 1

)(

        input clk,

        input [BIT_WIDTH-1:0] width, // current data width

        input [WIDTH-1:0] x, // input data

        output [WIDTH-1:0] y // result

);

        wire [WIDTH-1:0] yy;

        genvar i;

        generate for (i = 0; i < WIDTH; i++)

                begin :gen

                        assign yy[WIDTH-1-i] = x[i];

                end

        endgenerate

        always_ff @(posedge clk)

                y <= yy >> (WIDTH - width);

endmodule :bitrev

`endif