ID:13681 VHDL error at <location>: item cannot be assigned value

CAUSE: In an assignment at the specified location in a VHDL Design File (.vhd), you assigned a value to an item. However, you cannot assign values to the item. For example, in the following code, a Signal Assignment Statement assigns the value i to o'delayed, which is an attribute and therefore cannot be assigned a value:

ENTITY example IS
 
               
   PORT
   (
      i   :   IN   BIT;
      o   :   OUT  BIT
   );
	 
               
END example;
 
               
 
               
ARCHITECTURE ex1 OF example IS
BEGIN
   PROCESS(i)
   BEGIN
      o'delayed <= i;
   END PROCESS;
END ex1;