anchor.diff:         method Bit#(3) writeBurstCache(); // drive with 4'b0011
              return 3'b011;
          endmethod
  -       method Bit#(1) writeId();
  +       method Bit#(idWidth) writeId();
              return 0;
          endmethod
   
  
positive.code:            return 0;
         endmethod
  
         method Action writeResponse(Bit#(2) responseCode, Bit#(1) id);
         endmethod
     endinterface
  
  
negative.code: import FIFOF::*;
  import FIFOLevel::*;
  import SpecialFIFOs::*;
  import AxiClientServer::*;
  
  interface AxiMasterRead#(type busWidth);
     method ActionValue#(Bit#(32)) readAddr();
  