Added functional coverage

src/axi/axi_agent_config.sv

@@ -12,6 +12,30 @@ class axi_agent_config extends uvm_object;
     /// Maximum value of pre_response_delay
     int pre_response_delay_max = 20;
 
+    // --------------------------------------------------
+    // Functional coverage
+    // Cover the *actual* delays produced by the getters.
+    // --------------------------------------------------
+    /* verilator lint_off COVERIGN */
+    covergroup cg_pre_transaction_delay with function sample(int dly);
+        option.per_instance = 1;
+        cp_dly: coverpoint dly {
+            bins min = {pre_transaction_delay_min};
+            bins max = {pre_transaction_delay_max};
+            bins in_range[] = {[pre_transaction_delay_min:pre_transaction_delay_max]};
+        }
+    endgroup
+
+    covergroup cg_pre_response_delay with function sample(int dly);
+        option.per_instance = 1;
+        cp_dly: coverpoint dly {
+            bins min = {pre_response_delay_min};
+            bins max = {pre_response_delay_max};
+            bins in_range[] = {[pre_response_delay_min:pre_response_delay_max]};
+        }
+    endgroup
+    /* verilator lint_on COVERIGN */
+
     `uvm_object_utils_begin(axi_agent_config)
         `uvm_field_int(pre_transaction_delay_min, UVM_DEFAULT)
         `uvm_field_int(pre_transaction_delay_max, UVM_DEFAULT)
@@ -22,6 +46,8 @@ class axi_agent_config extends uvm_object;
     // --------------------------------------------------
     function new(string name = "axi_agent_config");
         super.new(name);
+        cg_pre_transaction_delay = new();
+        cg_pre_response_delay = new();
     endfunction
 
     // --------------------------------------------------
@@ -45,6 +71,7 @@ class axi_agent_config extends uvm_object;
         //     `uvm_error("get_pre_transaction_delay", "Randomization failed")
         // end
         dly = $urandom_range(pre_transaction_delay_max, pre_transaction_delay_min);
+        cg_pre_transaction_delay.sample(dly);
         return dly;
     endfunction
 
@@ -62,6 +89,7 @@ class axi_agent_config extends uvm_object;
         //     `uvm_error("get_pre_response_delay", "Randomization failed")
         // end
         dly = $urandom_range(pre_response_delay_max, pre_response_delay_min);
+        cg_pre_response_delay.sample(dly);
         return dly;
     endfunction
 endclass

src/axi/axi_transaction.sv

@@ -9,6 +9,48 @@ class axi_transaction extends uvm_sequence_item;
     rand bit [2:0]                      size; // Size
     rand bit [7:0]                      length; // Length
 
+    // --------------------------------------------------
+    // Functional coverage
+    // --------------------------------------------------
+    /* verilator lint_off COVERIGN */
+    covergroup cg_axi_transaction with function sample();
+        option.per_instance = 1;
+
+        cp_type:   coverpoint txn_type;
+        cp_size:   coverpoint size {
+            bins b0 = {3'd0};
+            bins b1 = {3'd1};
+            bins b2 = {3'd2};
+            bins b3 = {3'd3};
+            bins b4 = {3'd4};
+            bins b5 = {3'd5};
+            bins b6 = {3'd6};
+            bins b7 = {3'd7};
+        }
+        cp_len:    coverpoint length {
+            bins single = {8'd0};
+            bins short  = {[8'd1:8'd3]};
+            bins mid    = {[8'd4:8'd15]};
+            bins long   = {[8'd16:8'd255]};
+        }
+        cp_resp:   coverpoint resp;
+        cp_strb:   coverpoint strb {
+            bins none = {'0};
+            bins full = { {`DATA_WIDTH_DIV_8{1'b1}} };
+            bins other = default;
+        }
+        cp_addr_lsb: coverpoint addr[11:0] {
+            bins aligned = {12'h000};
+            bins unaligned = default;
+        }
+        cp_addr_msb: coverpoint addr[`ADDR_WIDTH-1 -: 4] iff (`ADDR_WIDTH >= 4);
+
+        x_type_size: cross cp_type, cp_size;
+        x_type_len:  cross cp_type, cp_len;
+        x_type_resp: cross cp_type, cp_resp;
+    endgroup
+    /* verilator lint_on COVERIGN */
+
     `uvm_object_utils_begin(axi_transaction)
         `uvm_field_enum(axi_transaction_type_t, txn_type, UVM_DEFAULT)
         `uvm_field_int(addr, UVM_DEFAULT)
@@ -22,6 +64,11 @@ class axi_transaction extends uvm_sequence_item;
     // Constructor
     function new(string name = "axi_transaction");
         super.new(name);
+        cg_axi_transaction = new();
+    endfunction
+
+    function void sample_coverage();
+        cg_axi_transaction.sample();
     endfunction
 
     // Get transaction id - made up of sequence ID and trasacton ID