new seq_lib file

axi_seq_lib.sv

@@ -0,0 +1,43 @@
+//base sequence : things common to all sequence
+class axi_base_seq extends uvm_sequence #(axi_tx);
+uvm_phase phase;
+`uvm_object_utils(axi_base_seq)
+`NEW_OBJ
+task pre_body();
+	//raise objection
+	phase = get_starting_phase();
+	if (phase !=null) begin
+	phase.raise_objection(this);
+	phase.phase_done.set_drain_time(this,100);
+	end
+endtask
+task post_body();
+	//drop objection 
+	if (phase !=null) begin
+	phase.drop_objection(this);
+	end
+endtask
+endclass
+
+//functional sequence: things specific to current sequence
+class axi_wr_rd_seq extends axi_base_seq;
+axi_tx tx;
+axi_tx txQ[$];
+`uvm_object_utils(axi_wr_rd_seq)
+`NEW_OBJ
+task body();
+//write/read to same loc
+repeat(1) begin
+	`uvm_do_with (req, {req.wr_rd==1;});
+	tx = new req; //shallow copy
+	txQ.push_back(tx);
+end
+//read_tx
+repeat(1) begin
+	tx = txQ.pop_front();
+	`uvm_do_with (req, {req.wr_rd==0; req.burst_len ==tx.burst_len; req.addr == tx.addr;});
+end
+endtask
+endclass
+
+