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robfinch |
`timescale 1ns / 1ps
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// ============================================================================
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// __
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// \\__/ o\ (C) 2006-2016 Robert Finch, Waterloo
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@finitron.ca
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// ||
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//
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// fp_decomp.v
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// - decompose floating point value
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// - parameterized width
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//
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//
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This source file 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, see <http://www.gnu.org/licenses/>.
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//
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// ============================================================================
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module fp_decomp(i, sgn, exp, man, fract, xz, mz, vz, inf, xinf, qnan, snan, nan);
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parameter WID=32;
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robfinch |
`include "fpSize.sv"
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robfinch |
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input [MSB:0] i;
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output sgn;
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output [EMSB:0] exp;
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output [FMSB:0] man;
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output [FMSB+1:0] fract; // mantissa with hidden bit recovered
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output xz; // denormalized - exponent is zero
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output mz; // mantissa is zero
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output vz; // value is zero (both exponent and mantissa are zero)
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output inf; // all ones exponent, zero mantissa
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output xinf; // all ones exponent
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output qnan; // nan
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output snan; // signalling nan
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output nan;
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// Decompose input
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assign sgn = i[MSB];
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assign exp = i[MSB-1:FMSB+1];
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assign man = i[FMSB:0];
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assign xz = !(|exp); // denormalized - exponent is zero
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assign mz = !(|man); // mantissa is zero
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assign vz = xz & mz; // value is zero (both exponent and mantissa are zero)
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assign inf = &exp & mz; // all ones exponent, zero mantissa
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assign xinf = &exp;
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assign qnan = &exp & man[FMSB];
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assign snan = &exp & !man[FMSB] & !mz;
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assign nan = &exp & !mz;
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assign fract = {!xz,i[FMSB:0]};
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endmodule
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