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draunzer |
/////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Trigonometric functions using double precision Floating Point Unit ////
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//// ////
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//// Author: Muni Aditya ////
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//// muni_aditya@yahoo.com ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2013 Muni Aditya ////
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//// muni_aditya@yahoo.com ////
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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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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`timescale 1ns / 100ps
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`define INPUT_WIDTH 32
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module cosecant_lut (quad, enable, degrees, data, rst, clk);
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input [1:0] quad;
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input enable;
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input rst;
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input [`INPUT_WIDTH-1:0] degrees ;
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input clk;
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//////////////inputs/////////////////
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output reg [63:0] data;
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//////////////output/////////////////
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always@(posedge clk )
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// needs to be positive in first and second quadrants
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begin
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if (quad == 2'b10 || quad == 2'b11)
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begin
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data[63] <= 1'b1;
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end
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else
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begin
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data[63] <= 1'b0;
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end
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if(enable)
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case (degrees)
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// look up table
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`INPUT_WIDTH'd0 : data[62:0] <= 64'h7ff0000000000000;
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`INPUT_WIDTH'd1 : data[62:0] <= 64'h404ca63b6cba7b71;
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`INPUT_WIDTH'd2 : data[62:0] <= 64'h403ca7596e271c86;
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`INPUT_WIDTH'd3 : data[62:0] <= 64'h40331b797e990dc0;
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`INPUT_WIDTH'd4 : data[62:0] <= 64'h402cabd2100d036c;
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`INPUT_WIDTH'd5 : data[62:0] <= 64'h4026f28a8ae3ab08;
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`INPUT_WIDTH'd6 : data[62:0] <= 64'h4023222ff85e6006;
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`INPUT_WIDTH'd7 : data[62:0] <= 64'h402069387b617567;
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`INPUT_WIDTH'd8 : data[62:0] <= 64'h401cbdbe5febffb0;
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`INPUT_WIDTH'd9 : data[62:0] <= 64'h401991df41de341d;
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`INPUT_WIDTH'd10 : data[62:0] <= 64'h401708fb2129168e;
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`INPUT_WIDTH'd11 : data[62:0] <= 64'h4014f69f90704701;
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`INPUT_WIDTH'd12 : data[62:0] <= 64'h40133d2b00047f03;
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`INPUT_WIDTH'd13 : data[62:0] <= 64'h4011c819f29be025;
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`INPUT_WIDTH'd14 : data[62:0] <= 64'h401088c56499f439;
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`INPUT_WIDTH'd15 : data[62:0] <= 64'h400ee8dd4748bf16;
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`INPUT_WIDTH'd16 : data[62:0] <= 64'h400d060d6ac58d68;
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`INPUT_WIDTH'd17 : data[62:0] <= 64'h400b5cc824ec982e;
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`INPUT_WIDTH'd18 : data[62:0] <= 64'h4009e3779b97f4a8;
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`INPUT_WIDTH'd19 : data[62:0] <= 64'h4008928aa26c4c08;
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`INPUT_WIDTH'd20 : data[62:0] <= 64'h400763f38fb4cf95;
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`INPUT_WIDTH'd21 : data[62:0] <= 64'h400652cbf905707a;
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`INPUT_WIDTH'd22 : data[62:0] <= 64'h40055b11998752c1;
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`INPUT_WIDTH'd23 : data[62:0] <= 64'h40047974b96de77f;
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`INPUT_WIDTH'd24 : data[62:0] <= 64'h4003ab32fb93a3a7;
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`INPUT_WIDTH'd25 : data[62:0] <= 64'h4002edfb187b1137;
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`INPUT_WIDTH'd26 : data[62:0] <= 64'h40023fd71f682341;
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`INPUT_WIDTH'd27 : data[62:0] <= 64'h40019f1b8c9526f0;
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`INPUT_WIDTH'd28 : data[62:0] <= 64'h40010a59ff3c94be;
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`INPUT_WIDTH'd29 : data[62:0] <= 64'h40008056af82561d;
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`INPUT_WIDTH'd30 : data[62:0] <= 64'h4000000000000001;
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`INPUT_WIDTH'd31 : data[62:0] <= 64'h3fff10cf62336e31;
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`INPUT_WIDTH'd32 : data[62:0] <= 64'h3ffe317ab5700fce;
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`INPUT_WIDTH'd33 : data[62:0] <= 64'h3ffd6093ce555fa8;
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`INPUT_WIDTH'd34 : data[62:0] <= 64'h3ffc9cd7b485648a;
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`INPUT_WIDTH'd35 : data[62:0] <= 64'h3ffbe52877982347;
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`INPUT_WIDTH'd36 : data[62:0] <= 64'h3ffb38880b4603e4;
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`INPUT_WIDTH'd37 : data[62:0] <= 64'h3ffa9613f8fd7862;
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`INPUT_WIDTH'd38 : data[62:0] <= 64'h3ff9fd01bf93f3a3;
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`INPUT_WIDTH'd39 : data[62:0] <= 64'h3ff96c9bc1d2abfe;
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`INPUT_WIDTH'd40 : data[62:0] <= 64'h3ff8e43eaadf9334;
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`INPUT_WIDTH'd41 : data[62:0] <= 64'h3ff863573463a809;
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`INPUT_WIDTH'd42 : data[62:0] <= 64'h3ff7e9603e24eb24;
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`INPUT_WIDTH'd43 : data[62:0] <= 64'h3ff775e129d20b11;
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`INPUT_WIDTH'd44 : data[62:0] <= 64'h3ff7086c7026f77e;
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`INPUT_WIDTH'd45 : data[62:0] <= 64'h3ff6a09e667f3bcd;
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`INPUT_WIDTH'd46 : data[62:0] <= 64'h3ff63e1c2d781ada;
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`INPUT_WIDTH'd47 : data[62:0] <= 64'h3ff5e092c2857578;
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`INPUT_WIDTH'd48 : data[62:0] <= 64'h3ff587b62f6162b4;
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`INPUT_WIDTH'd49 : data[62:0] <= 64'h3ff53340d31354d5;
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`INPUT_WIDTH'd50 : data[62:0] <= 64'h3ff4e2f2c0fa463b;
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`INPUT_WIDTH'd51 : data[62:0] <= 64'h3ff4969132d53892;
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`INPUT_WIDTH'd52 : data[62:0] <= 64'h3ff44de60b3c3d86;
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`INPUT_WIDTH'd53 : data[62:0] <= 64'h3ff408bf665efb99;
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`INPUT_WIDTH'd54 : data[62:0] <= 64'h3ff3c6ef372fe94f;
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`INPUT_WIDTH'd55 : data[62:0] <= 64'h3ff3884aef684af8;
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`INPUT_WIDTH'd56 : data[62:0] <= 64'h3ff34cab310ac280;
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`INPUT_WIDTH'd57 : data[62:0] <= 64'h3ff313eb883ae677;
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`INPUT_WIDTH'd58 : data[62:0] <= 64'h3ff2ddea2c696f6a;
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`INPUT_WIDTH'd59 : data[62:0] <= 64'h3ff2aa87c7f7612b;
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`INPUT_WIDTH'd60 : data[62:0] <= 64'h3ff279a74590331d;
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`INPUT_WIDTH'd61 : data[62:0] <= 64'h3ff24b2da2943b49;
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`INPUT_WIDTH'd62 : data[62:0] <= 64'h3ff21f01c602373d;
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`INPUT_WIDTH'd63 : data[62:0] <= 64'h3ff1f50c5b61511e;
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`INPUT_WIDTH'd64 : data[62:0] <= 64'h3ff1cd37b13ce9c7;
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`INPUT_WIDTH'd65 : data[62:0] <= 64'h3ff1a76f9ad128b7;
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`INPUT_WIDTH'd66 : data[62:0] <= 64'h3ff183a154932d8b;
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`INPUT_WIDTH'd67 : data[62:0] <= 64'h3ff161bb6b4a03f3;
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`INPUT_WIDTH'd68 : data[62:0] <= 64'h3ff141ada5766663;
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`INPUT_WIDTH'd69 : data[62:0] <= 64'h3ff12368eecf1f68;
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`INPUT_WIDTH'd70 : data[62:0] <= 64'h3ff106df459ea073;
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`INPUT_WIDTH'd71 : data[62:0] <= 64'h3ff0ec03a9d451e4;
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`INPUT_WIDTH'd72 : data[62:0] <= 64'h3ff0d2ca0da1530d;
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`INPUT_WIDTH'd73 : data[62:0] <= 64'h3ff0bb27477cf20f;
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`INPUT_WIDTH'd74 : data[62:0] <= 64'h3ff0a51105712a50;
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`INPUT_WIDTH'd75 : data[62:0] <= 64'h3ff0907dc1930690;
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`INPUT_WIDTH'd76 : data[62:0] <= 64'h3ff07d64b78dea34;
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`INPUT_WIDTH'd77 : data[62:0] <= 64'h3ff06bbddb2b91b8;
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`INPUT_WIDTH'd78 : data[62:0] <= 64'h3ff05b81cfc51885;
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`INPUT_WIDTH'd79 : data[62:0] <= 64'h3ff04ca9e08b8cb6;
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`INPUT_WIDTH'd80 : data[62:0] <= 64'h3ff03f2ff9989907;
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`INPUT_WIDTH'd81 : data[62:0] <= 64'h3ff0330ea1b99998;
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`INPUT_WIDTH'd82 : data[62:0] <= 64'h3ff02840f4e91085;
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`INPUT_WIDTH'd83 : data[62:0] <= 64'h3ff01ec29f6be927;
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`INPUT_WIDTH'd84 : data[62:0] <= 64'h3ff0168fd9895209;
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`INPUT_WIDTH'd85 : data[62:0] <= 64'h3ff00fa563d53203;
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`INPUT_WIDTH'd86 : data[62:0] <= 64'h3ff00a008406617c;
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`INPUT_WIDTH'd87 : data[62:0] <= 64'h3ff0059f0252e0bc;
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`INPUT_WIDTH'd88 : data[62:0] <= 64'h3ff0027f274d432f;
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`INPUT_WIDTH'd89 : data[62:0] <= 64'h3ff0009fba3f7835;
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`INPUT_WIDTH'd90 : data[62:0] <= 64'h3ff0000000000000;
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default:data <= 64'h0;
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endcase
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else
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data <= 64'hxxxxxxxxxxxxxxx;
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end
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endmodule
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