Subversion Repositories jt51

/*  This file is part of JT51.

    JT51 is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    JT51 is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with JT51.  If not, see <http://www.gnu.org/licenses/>.

        Author: Jose Tejada Gomez. Twitter: @topapate

        Version: 1.0

        Date: 27-10-2016

        */

`timescale 1ns / 1ps

module jt51_sh2 #(parameter width=5, stages=32 )

(

        input                                                   clk,

        input                                                   en,

        input                                                   ld,

        input           [width-1:0]                      din,

        output          [width-1:0]                      drop

);

genvar i;

generate

        for( i=0; i<width; i=i+1) begin: shifter

                jt51_sh1 #(.stages(stages)) u_sh1(

                        .clk    ( clk    ),

                        .en             ( en     ),

                        .ld             ( ld     ),

                        .din    ( din[i] ),

                        .drop   ( drop[i])

                );

        end

endgenerate

endmodule

module jt51_sh1 #(parameter stages=32)

(

        input   clk,

        input   en,

        input   ld,

        input   din,

        output  drop

);

reg     [stages-1:0] shift;

assign drop = shift[0];

wire next = ld ? din : drop;

always @(posedge clk )

        if( en )

                shift <= {next, shift[stages-1:1]};

endmodule