Separated manager and subordinate drivers

Other clean up and changes

src/axi/axi_subordinate_driver.sv

@@ -0,0 +1,72 @@
+// ----------------------------------------------------------------------
+class axi_subordinate_driver extends axi_driver;
+
+    `uvm_component_utils(axi_subordinate_driver)
+
+    // --------------------------------------------------
+    // Constructor
+    function new(string name = "axi_subordinate_driver", uvm_component parent = null);
+        super.new(name, parent);
+    endfunction
+
+    // --------------------------------------------------
+    virtual task run_phase(uvm_phase phase);
+        `uvm_info("run_phase", $sformatf("Running AXI subordinate driver: %s",
+            get_full_name()), UVM_LOW)
+
+        if (s_if == null) begin
+            `uvm_error("run_phase", "subordinate interface is null, cannot respond to transactions")
+        end
+
+        forever begin
+            @(posedge s_if.ARESETn);
+
+            while (s_if.ARESETn != 0) begin
+                @(posedge s_if.ACLK);
+
+                // Following could happen on the same cycle
+                if (s_if.AWVALID == 1'b1) begin
+                    respond_to_write_txn();
+                end
+
+                if (s_if.ARVALID == 1'b1) begin
+                    respond_to_read_txn();
+                end
+
+                @(negedge s_if.ACLK);
+            end
+        end
+    endtask
+
+    // ------------------------------------------------------------
+    task respond_to_write_txn();
+        axi_transaction req;
+
+        req = axi_transaction::type_id::create("req");
+        req.txn_type = AXI_WRITE;
+        req.addr = s_if.AWADDR;
+        req.data = s_if.WDATA;
+        req.strb = s_if.WSTRB;
+
+        @(posedge s_if.ACLK);
+
+        `uvm_info("respond_to_write_txn", $sformatf("Responding to AXI write transaction:\n%s", req.sprint()), UVM_LOW)
+
+        s_if.AWREADY = 1'b1;
+    endtask
+
+    // ------------------------------------------------------------
+    task respond_to_read_txn();
+        axi_transaction req;
+
+        req = axi_transaction::type_id::create("req");
+        req.txn_type = AXI_READ;
+        req.addr = s_if.ARADDR;
+
+        @(posedge s_if.ACLK);
+
+        `uvm_info("respond_to_write_txn", $sformatf("Responding to AXI write transaction:\n%s", req.sprint()), UVM_LOW)
+
+        s_if.ARREADY = 1'b1;
+    endtask
+endclass : axi_subordinate_driver