tests/simple/sincos.v

   1 // File: design.v
   2 // Generated by MyHDL 0.8
   3 // Date: Tue Dec  3 04:33:14 2013
   4
   5
   6 module d (
   7     cos_z0,
   8     sin_z0,
   9     done,
  10     z0,
  11     start,
  12     clock,
  13     reset
  14 );
  15 // Sine and cosine computer.
  16 //
  17 // This module computes the sine and cosine of an input angle. The
  18 // floating point numbers are represented as integers by scaling them
  19 // up with a factor corresponding to the number of bits after the point.
  20 //
  21 // Ports:
  22 // -----
  23 // cos_z0: cosine of the input angle
  24 // sin_z0: sine of the input angle
  25 // done: output flag indicated completion of the computation
  26 // z0: input angle
  27 // start: input that starts the computation on a posedge
  28 // clock: clock input
  29 // reset: reset input
  30
  31 output signed [19:0] cos_z0;
  32 reg signed [19:0] cos_z0;
  33 output signed [19:0] sin_z0;
  34 reg signed [19:0] sin_z0;
  35 output done;
  36 reg done;
  37 input signed [19:0] z0;
  38 input start;
  39 input clock;
  40 input reset;
  41
  42 (* gentb_constant="0" *)
  43 wire reset;
  44
  45 always @(posedge clock, posedge reset) begin: DESIGN_PROCESSOR
  46     reg [5-1:0] i;
  47     reg [1-1:0] state;
  48     reg signed [20-1:0] dz;
  49     reg signed [20-1:0] dx;
  50     reg signed [20-1:0] dy;
  51     reg signed [20-1:0] y;
  52     reg signed [20-1:0] x;
  53     reg signed [20-1:0] z;
  54     if (reset) begin
  55         state = 1'b0;
  56         cos_z0 <= 1;
  57         sin_z0 <= 0;
  58         done <= 1'b0;
  59         x = 0;
  60         y = 0;
  61         z = 0;
  62         i = 0;
  63     end
  64     else begin
  65         case (state)
  66             1'b0: begin
  67                 if (start) begin
  68                     x = 159188;
  69                     y = 0;
  70                     z = z0;
  71                     i = 0;
  72                     done <= 1'b0;
  73                     state = 1'b1;
  74                 end
  75             end
  76             1'b1: begin
  77                 dx = $signed(y >>> $signed({1'b0, i}));
  78                 dy = $signed(x >>> $signed({1'b0, i}));
  79                 case (i)
  80                     0: dz = 205887;
  81                     1: dz = 121542;
  82                     2: dz = 64220;
  83                     3: dz = 32599;
  84                     4: dz = 16363;
  85                     5: dz = 8189;
  86                     6: dz = 4096;
  87                     7: dz = 2048;
  88                     8: dz = 1024;
  89                     9: dz = 512;
  90                     10: dz = 256;
  91                     11: dz = 128;
  92                     12: dz = 64;
  93                     13: dz = 32;
  94                     14: dz = 16;
  95                     15: dz = 8;
  96                     16: dz = 4;
  97                     17: dz = 2;
  98                     default: dz = 1;
  99                 endcase
 100                 if ((z >= 0)) begin
 101                     x = x - dx;
 102                     y = y + dy;
 103                     z = z - dz;
 104                 end
 105                 else begin
 106                     x = x + dx;
 107                     y = y - dy;
 108                     z = z + dz;
 109                 end
 110                 if ((i == (19 - 1))) begin
 111                     cos_z0 <= x;
 112                     sin_z0 <= y;
 113                     state = 1'b0;
 114                     done <= 1'b1;
 115                 end
 116                 else begin
 117                     i = i + 1;
 118                 end
 119             end
 120         endcase
 121     end
 122 end
 123
 124 endmodule