数据类型转换函数的实例 从 std_logic_vector到 Integer:p.279(表4-38) function cony integer(x: std logic vector) return integer is variable result: integer; begin result:=U for I in x'range loop result = result*2 case x(iis when 0L=> null; when ' 1H=> result =result+1 when others = null: end case; end loop; return result: end conv integer;数据类型转换函数的实例 从std_logic_vector到integer：p.279（表4-38） function conv_integer (x: std_logic_vector) return integer is variable result: integer; begin result := 0; for I in x'range loop result :=result*2; case x(i) is when '0'|'L' => null; when '1'|'H' => result := result+1; when others => null; end case; end loop; return result; end conv_integer;