45 lines
1.5 KiB
VHDL
45 lines
1.5 KiB
VHDL
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-- Copyright (c) 2015 CERN
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-- Maciej Suminski <maciej.suminski@cern.ch>
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--
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-- This source code is free software; you can redistribute it
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-- and/or modify it in source code form under the terms of the GNU
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-- General Public License as published by the Free Software
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-- Foundation; either version 2 of the License, or (at your option)
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-- any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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-- Basic test for functions that work with unbounded vectors as return
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-- and param types.
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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package vhdl_unbounded_func_pkg is
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function f_manch_encoder (word_i :std_logic_vector) return std_logic_vector;
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end vhdl_unbounded_func_pkg;
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package body vhdl_unbounded_func_pkg is
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function f_manch_encoder (word_i : std_logic_vector) return std_logic_vector is
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variable word_manch_o : std_logic_vector((2*word_i'length) - 1 downto 0);
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begin
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for I in word_i'range loop
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word_manch_o (I*2) := not word_i(I);
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word_manch_o (I*2+1) := word_i(I);
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end loop;
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return word_manch_o;
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end function;
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end vhdl_unbounded_func_pkg;
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