//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG ////
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//// ////
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//// ////
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//// This source file may be used and distributed without ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// later version. ////
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//// ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// details. ////
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//// ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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module
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module
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one_hot_encoder
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one_hot_encoder
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#(
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#(
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A, // encoder select width
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A, // encoder select width
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D = 2 ** A
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D = 2 ** A
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)
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)
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(
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(
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input [A-1:0] select,
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input [A-1:0] select,
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output [D-1:0] encoded
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output [D-1:0] encoded
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);
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);
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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localparam W = 2 ** (A-1);
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localparam W = 2 ** (A-1);
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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generate
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generate
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if(A == 1)
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if(A == 1)
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begin: mux_gen
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begin: one_hot_encoder_gen
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assign encoded[1:0] = select[0] ? 2'b10 :2'b01;
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assign encoded[1:0] = select[0] ? 2'b10 :2'b01;
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end
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end
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else
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else
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begin: recurse_mux_gen
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begin: recurse_one_hot_encoder_gen
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wire [W-1:0] encoder_out;
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wire [W-1:0] encoder_out;
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one_hot_encoder #(.A(A - 1))
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one_hot_encoder #(.A(A - 1))
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one_hot_encoder_i
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one_hot_encoder_i
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(
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(
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.select(select[A-2:0]),
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.select(select[A-2:0]),
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.encoded(encoder_out)
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.encoded(encoder_out)
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);
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);
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assign encoded = select[A-1] ? {encoder_out, {W{1'b0}}} : {{W{1'b0}}, encoder_out};
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assign encoded = select[A-1] ? {encoder_out, {W{1'b0}}} : {{W{1'b0}}, encoder_out};
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end
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end
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endgenerate
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endgenerate
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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endmodule
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endmodule
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