init units and bins

calc_tb.sv

@@ -13,7 +13,14 @@ parameter OP_IDLE = 0, OP_ADD = 1, OP_SUB = 2, OP_MUL = 3, OP_DIV = 4;
 CALC_logic calc_dut (clk, rst, calc, A, B, OP, STATE_C, C, valid);
 
 covergroup cg @(posedge clk);
-  c1: coverpoint STATE_C;
+  c1: coverpoint STATE_C {
+    bins S_IDLE = {0};
+    bins S_ADD = {1};
+    bins S_SUB = {2};
+    bins S_MUL = {3};
+    bins S_DIV = {4};
+  };
+  c2: coverpoint $unit.calc_dut.STATE_C;
 endgroup: cg
 
 cg cover_inst = new; // instatiate the cover model