class axi_coverage extends uvm_subscriber#(sequence_item);
`uvm_component_utils(axi_coverage);
axi_seq_item txn;
covergroup axi_cvrg;
@(posedge clk)
coverpoint awlen{ bins b1[]={[1,3,7,15]};}
coverpoint awsize{ bins b2[]={[1:7]};}
coverpoint awburst{ bins b3[]={0,1,2};
                    ignore_bins b31={3};}
endgroup