tests/simple/task_func.v

   1
   2 module task_func_test01(clk, a, b, c, x, y, z, w);
   3
   4 input clk;
   5 input [7:0] a, b, c;
   6 output reg [7:0] x, y, z, w;
   7
   8 function [7:0] sum_shift;
   9 input [3:0] s1, s2, s3;
  10 sum_shift = s1 + (s2 << 2) + (s3 << 4);
  11 endfunction
  12
  13 task reset_w;
  14 w = 0;
  15 endtask
  16
  17 task add_to;
  18 output [7:0] out;
  19 input [7:0] in;
  20 out = out + in;
  21 endtask
  22
  23 always @(posedge clk) begin
  24         x = sum_shift(a, b, c);
  25         y = sum_shift(a[7:4], b[5:2], c[3:0]);
  26         z = sum_shift(a[0], b[5:4], c >> 5) ^ sum_shift(1, 2, 3);
  27
  28         reset_w;
  29         add_to(w, x);
  30         add_to(w, y);
  31         add_to(w, z);
  32 end
  33
  34 endmodule
  35
  36 // -------------------------------------------------------------------
  37
  38 module task_func_test02(clk, a, b, c, x, y, z, w);
  39
  40 input clk;
  41 input [7:0] a, b, c;
  42 output reg [7:0] x, y, z, w;
  43
  44 function [7:0] sum_shift(input [3:0] s1, s2, s3);
  45 sum_shift = s1 + (s2 << 2) + (s3 << 4);
  46 endfunction
  47
  48 task reset_w;
  49 w = 0;
  50 endtask
  51
  52 task add_to(output [7:0] out, input [7:0] in);
  53 out = out + in;
  54 endtask
  55
  56 always @(posedge clk) begin
  57         x = sum_shift(a, b, c);
  58         y = sum_shift(a[7:4], b[5:2], c[3:0]);
  59         z = sum_shift(a[0], b[5:4], c >> 5) ^ sum_shift(1, 2, 3);
  60
  61         reset_w;
  62         add_to(w, x);
  63         add_to(w, y);
  64         add_to(w, z);
  65 end
  66
  67 endmodule
  68
  69 // -------------------------------------------------------------------
  70
  71 module task_func_test03(input [7:0] din_a, input [7:0] din_b, output [7:0] dout_a);
  72         assign dout_a = test(din_a,din_b);
  73         function [7:0] test;
  74                 input [7:0] a;
  75                 input [7:0] b;
  76                 begin : TEST
  77                         integer i;
  78                         for (i = 0; i <= 7; i = i + 1)
  79                                 test[i] = a[i] & b[i];
  80                 end
  81         endfunction
  82 endmodule
  83
  84 // -------------------------------------------------------------------
  85
  86 module task_func_test04(input [7:0] in, output [7:0] out1, out2, out3, out4);
  87         parameter p = 23;
  88         parameter px = 42;
  89         function [7:0] test1;
  90                 input [7:0] i;
  91                 parameter p = 42;
  92                 begin
  93                         test1 = i + p;
  94                 end
  95         endfunction
  96         function [7:0] test2;
  97                 input [7:0] i;
  98                 parameter p2 = p+42;
  99                 begin
 100                         test2 = i + p2;
 101                 end
 102         endfunction
 103         function [7:0] test3;
 104                 input [7:0] i;
 105                 begin
 106                         test3 = i + p;
 107                 end
 108         endfunction
 109         function [7:0] test4;
 110                 input [7:0] i;
 111                 parameter px = p + 13;
 112                 parameter p3 = px - 37;
 113                 parameter p4 = p3 ^ px;
 114                 begin
 115                         test4 = i + p4;
 116                 end
 117         endfunction
 118         assign out1 = test1(in);
 119         assign out2 = test2(in);
 120         assign out3 = test3(in);
 121         assign out4 = test4(in);
 122 endmodule
 123
 124 // -------------------------------------------------------------------
 125
 126 // https://github.com/YosysHQ/yosys/issues/857
 127 module task_func_test05(data_in,data_out,clk);
 128         output reg data_out;
 129         input data_in;
 130         input clk;
 131
 132         task myTask;
 133                 output out;
 134                 input in;
 135                 out = in;
 136         endtask
 137
 138         always @(posedge clk) begin
 139                 myTask(data_out,data_in);
 140         end
 141 endmodule