Coverage Group SystemVerilog - EDA Playground
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// Code your testbench here
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// or browse Examples
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​
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module LED_PANEL_TB();
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​
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  //Wildcard import of all packaged items:
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  import LED_PKG::*;
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​
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  //Declare a variable of panel type:
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  LED_PANEL LP;
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  initial
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    begin
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    #10 LP = new();    
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      fork
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        LP.WALK_RED(0, GRN); //Walk through row 1 with GRN background.
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        LP.WALK_RED(1, YEL); //Walk through row 2 with YEL background.
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      join
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      repeat (25)
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      begin:TRIALS
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        //Construct new LP:
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        //#10 LP = new();
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        LP.randomize();
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        LP.TALLY_RED();
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        $display(
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          "%4t ms: %p  @'h%h",  $time, LP.PANEL, LP
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        );
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      end:  TRIALS
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    end
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  initial begin
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    $dumpfile("dump.vcd");
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    $dumpvars;
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    #(150ms);  
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    //$finish();    //Always call finish with always block, otherwise, it will run forever
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  end
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  final begin
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  $display("Total red alerts: %0d", LP.ALERTS);
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  $display(
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      "Coverage: %9.6f %%\nCross Coverage: %9.6f %%\n",
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    LP.CVG.get_coverage(),
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    LP.CVG.COMBS.get_coverage()
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    );
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  end
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​
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endmodule: LED_PANEL_TB
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78
 
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// Code your design here
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// Code your design here
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//Unit-scope items:
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timeunit 1ms;
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timeprecision 1ms;
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​
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package LED_PKG;
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​
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typedef enum {
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  BLU,
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  GRN,
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  YEL,
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  RED
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} led_et;
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​
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typedef led_et panel_t [2][4];  //It has to be unpacked since LED_t is of type enum and it's values are of type int so it can't be                                  packed
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​
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class LED_PANEL;
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​
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  //A random variable:
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  rand panel_t PANEL;
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  //Constrain all 2x4 LEDs:
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  constraint COLOR_con {
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    foreach (PANEL[J,K])
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      PANEL[J][K] dist {
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        BLU := 30,
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        GRN := 40,
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        YEL := 25,
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        RED :=  5
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      };     // 100 total.
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  }
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  //An embedded coverage group:
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  covergroup CVG;
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    //Individual LED coverages:
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    LED11: coverpoint PANEL[0][1];
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    LED12: coverpoint PANEL[0][2];
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    LED13: coverpoint PANEL[0][3];
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    LED14: coverpoint PANEL[0][0];
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    LED21: coverpoint PANEL[1][1];
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    LED22: coverpoint PANEL[1][2];
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    LED23: coverpoint PANEL[1][3];
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    LED24: coverpoint PANEL[1][0];
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    COMBS: cross LED11, LED12, LED13, LED14, LED21, LED22, LED23, LED24;
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  endgroup: CVG
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  //Red-alert status:
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  int ALERTS = 0;
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  bit DANGER;
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  function new();
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    this.srandom(100);
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    CVG = new();
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  endfunction
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​
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  //Count up red alerts:
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  task TALLY_RED();
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    DANGER = RED inside {PANEL};
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    if (DANGER) ++ALERTS;
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    CVG.sample();
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  endtask: TALLY_RED
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  //Walk a RED through one row of LEDs:
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  task WALK_RED (int ROW_arg, led_et BKGND_arg);
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    #10ms PANEL[ROW_arg] = '{0: RED, default:BKGND_arg};
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    $display("  %4t ms: %p \n", $time, PANEL);
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    #10ms PANEL[ROW_arg] = '{1: RED, default:BKGND_arg};
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    $display("  %4t ms: %p \n", $time, PANEL);
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    #10ms PANEL[ROW_arg] = '{3: RED, default:BKGND_arg};
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    $display("  %4t ms: %p \n", $time, PANEL);
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    #10ms PANEL[ROW_arg] = '{2: RED, default:BKGND_arg};
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    $display("  %4t ms: %p \n", $time, PANEL);
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    #10ms PANEL = '{default:BKGND_arg};
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    $display("  %4t ms: %p \n", $time, PANEL);
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  endtask: WALK_RED
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​
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endclass: LED_PANEL
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​
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endpackage: LED_PKG
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