PCIU: Hardware Implementations of an Efficient Packet Classification Algorithm with an Incremental Update Capability

Algorithm 1

if (rising_edge(CLK)) then

   count:= conv_integer(shift);

   store1:= (To_bitvector(input1) srl count); – srl (shift right operator)

   store2:= (To_bitvector(input2) srl count);

   actual1:=to_stdlogicvector(store1(24 to 31));

   actual2:=to_stdlogicvector(store2(24 to 31));

   if (actual1 < actual2) then

       if (((actual1 <= point) and (actual2 >= point))=true) then

        output <="00000000000000000000000000000001";

       else

        output <="00000000000000000000000000000000";

       end if;

   elsif (((actual1>= point) and (actual2<= point))=true) then

     output <="00000000000000000000000000000001";

   else

     output <="00000000000000000000000000000000";

   end if;

else

    null;

end if;