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dbrochart |
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---- ----
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---- limiter_synth.vhd ----
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---- ----
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---- This file is part of the turbo decoder IP core project ----
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---- http://www.opencores.org/projects/turbocodes/ ----
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---- ----
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---- Author(s): ----
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---- - David Brochart(dbrochart@opencores.org) ----
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---- ----
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---- All additional information is available in the README.txt ----
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---- file. ----
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---- ----
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----------------------------------------------------------------------
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---- ----
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---- Copyright (C) 2005 Authors ----
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---- ----
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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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---- 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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---- ----
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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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---- 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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---- later version. ----
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---- ----
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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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---- 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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---- details. ----
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---- ----
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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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---- from http://www.opencores.org/lgpl.shtml ----
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---- ----
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----------------------------------------------------------------------
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architecture synth of limiter is
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begin
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aLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(a)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(a)) >= 2**(SIG_WIDTH - 1) else
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a;
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bLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(b)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(b)) >= 2**(SIG_WIDTH - 1) else
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b;
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yLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(y)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(y)) >= 2**(SIG_WIDTH - 1) else
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y;
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wLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(w)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(w)) >= 2**(SIG_WIDTH - 1) else
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w;
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yIntLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(yInt)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(yInt)) >= 2**(SIG_WIDTH - 1) else
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yInt;
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wIntLim <= std_logic_vector(conv_signed(-2**(SIG_WIDTH - 1) + 1, SIG_WIDTH)) when conv_integer(unsigned(wInt)) <= -2**(SIG_WIDTH - 1) else
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std_logic_vector(conv_signed(2**(SIG_WIDTH - 1) - 1, SIG_WIDTH)) when conv_integer(unsigned(wInt)) >= 2**(SIG_WIDTH - 1) else
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wInt;
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end;
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