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[/] [raptor64/] [trunk/] [rtl/] [verilog/] [fp/] [fp_decomp.v] - Rev 52
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/* ============================================================================ (C) 2006, 2007 Robert T Finch All rights reserved. rob@birdcomputer.ca fp_decomp.v - decompose floating point value - parameterized width Verilog 1995 This source code is free for use and modification for non-commercial or evaluation purposes, provided this copyright statement and disclaimer remains present in the file. If the code is modified, please state the origin and note that the code has been modified. NO WARRANTY. THIS Work, IS PROVIDEDED "AS IS" WITH NO WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED. The user must assume the entire risk of using the Work. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES WHATSOEVER RELATING TO THE USE OF THIS WORK, OR YOUR RELATIONSHIP WITH THE AUTHOR. IN ADDITION, IN NO EVENT DOES THE AUTHOR AUTHORIZE YOU TO USE THE WORK IN APPLICATIONS OR SYSTEMS WHERE THE WORK'S FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO RESULT IN A SIGNIFICANT PHYSICAL INJURY, OR IN LOSS OF LIFE. ANY SUCH USE BY YOU IS ENTIRELY AT YOUR OWN RISK, AND YOU AGREE TO HOLD THE AUTHOR AND CONTRIBUTORS HARMLESS FROM ANY CLAIMS OR LOSSES RELATING TO SUCH UNAUTHORIZED USE. Ref: Webpack 8.1i Spartan3-4 xc3s1000 4ft256 10 slices / 20 LUTs / 12 ns (32 bits) ============================================================================ */ module fp_decomp(i, sgn, exp, man, fract, xz, mz, vz, inf, xinf, qnan, snan, nan); parameter WID=32; localparam MSB = WID-1; localparam EMSB = WID==80 ? 14 : WID==64 ? 10 : WID==52 ? 10 : WID==48 ? 10 : WID==44 ? 10 : WID==42 ? 10 : WID==40 ? 9 : WID==32 ? 7 : WID==24 ? 6 : 4; localparam FMSB = WID==80 ? 63 : WID==64 ? 51 : WID==52 ? 39 : WID==48 ? 35 : WID==44 ? 31 : WID==42 ? 29 : WID==40 ? 28 : WID==32 ? 22 : WID==24 ? 15 : 9; input [MSB:0] i; output sgn; output [EMSB:0] exp; output [FMSB:0] man; output [FMSB+1:0] fract; // mantissa with hidden bit recovered output xz; // denormalized - exponent is zero output mz; // mantissa is zero output vz; // value is zero (both exponent and mantissa are zero) output inf; // all ones exponent, zero mantissa output xinf; // all ones exponent output qnan; // nan output snan; // signalling nan output nan; // Decompose input assign sgn = i[MSB]; assign exp = i[MSB-1:FMSB+1]; assign man = i[FMSB:0]; assign xz = !(|exp); // denormalized - exponent is zero assign mz = !(|man); // mantissa is zero assign vz = xz & mz; // value is zero (both exponent and mantissa are zero) assign inf = &exp & mz; // all ones exponent, zero mantissa assign xinf = &exp; assign qnan = &exp & man[FMSB]; assign snan = &exp & !man[FMSB] & !mz; assign nan = &exp & !mz; assign fract = {!xz,i[FMSB:0]}; endmodule
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