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100 lines
3.5 KiB
Coq
100 lines
3.5 KiB
Coq
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// Copyright 2007 Altera Corporation. All rights reserved.
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// Altera products are protected under numerous U.S. and foreign patents,
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// maskwork rights, copyrights and other intellectual property laws.
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//
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// This reference design file, and your use thereof, is subject to and governed
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// by the terms and conditions of the applicable Altera Reference Design
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// License Agreement (either as signed by you or found at www.altera.com). By
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// using this reference design file, you indicate your acceptance of such terms
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// and conditions between you and Altera Corporation. In the event that you do
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// not agree with such terms and conditions, you may not use the reference
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// design file and please promptly destroy any copies you have made.
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//
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// This reference design file is being provided on an "as-is" basis and as an
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// accommodation and therefore all warranties, representations or guarantees of
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// any kind (whether express, implied or statutory) including, without
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// limitation, warranties of merchantability, non-infringement, or fitness for
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// a particular purpose, are specifically disclaimed. By making this reference
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// design file available, Altera expressly does not recommend, suggest or
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// require that this reference design file be used in combination with any
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// other product not provided by Altera.
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/////////////////////////////////////////////////////////////////////////////
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// Look up table for approximate floating point
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// division - total area is seven 6-LUTs.
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module approx_fp_div_lut (in, out);
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input [5:0] in;
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output [6:0] out;
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reg [6:0] out;
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always @(in) begin
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case (in)
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6'h0 : out <= 7'h7c;
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6'h1 : out <= 7'h78;
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6'h2 : out <= 7'h74;
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6'h3 : out <= 7'h70;
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6'h4 : out <= 7'h6d;
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6'h5 : out <= 7'h6a;
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6'h6 : out <= 7'h66;
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6'h7 : out <= 7'h63;
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6'h8 : out <= 7'h60;
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6'h9 : out <= 7'h5d;
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6'ha : out <= 7'h5a;
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6'hb : out <= 7'h57;
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6'hc : out <= 7'h54;
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6'hd : out <= 7'h52;
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6'he : out <= 7'h4f;
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6'hf : out <= 7'h4c;
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6'h10 : out <= 7'h4a;
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6'h11 : out <= 7'h47;
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6'h12 : out <= 7'h45;
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6'h13 : out <= 7'h43;
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6'h14 : out <= 7'h40;
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6'h15 : out <= 7'h3e;
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6'h16 : out <= 7'h3c;
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6'h17 : out <= 7'h3a;
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6'h18 : out <= 7'h38;
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6'h19 : out <= 7'h36;
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6'h1a : out <= 7'h34;
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6'h1b : out <= 7'h32;
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6'h1c : out <= 7'h30;
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6'h1d : out <= 7'h2e;
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6'h1e : out <= 7'h2c;
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6'h1f : out <= 7'h2a;
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6'h20 : out <= 7'h28;
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6'h21 : out <= 7'h27;
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6'h22 : out <= 7'h25;
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6'h23 : out <= 7'h23;
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6'h24 : out <= 7'h22;
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6'h25 : out <= 7'h20;
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6'h26 : out <= 7'h1f;
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6'h27 : out <= 7'h1d;
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6'h28 : out <= 7'h1c;
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6'h29 : out <= 7'h1a;
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6'h2a : out <= 7'h19;
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6'h2b : out <= 7'h17;
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6'h2c : out <= 7'h16;
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6'h2d : out <= 7'h14;
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6'h2e : out <= 7'h13;
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6'h2f : out <= 7'h12;
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6'h30 : out <= 7'h10;
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6'h31 : out <= 7'hf;
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6'h32 : out <= 7'he;
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6'h33 : out <= 7'hd;
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6'h34 : out <= 7'hc;
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6'h35 : out <= 7'ha;
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6'h36 : out <= 7'h9;
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6'h37 : out <= 7'h8;
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6'h38 : out <= 7'h7;
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6'h39 : out <= 7'h6;
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6'h3a : out <= 7'h5;
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6'h3b : out <= 7'h4;
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6'h3c : out <= 7'h3;
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6'h3d : out <= 7'h2;
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6'h3e : out <= 7'h1;
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6'h3f : out <= 7'h0;
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endcase
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end
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endmodule
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