object_id str - The name of the entity with which
the port is associated. This can be the type name of an entity
defined in the entity library, in which case the port will be
positioned on all the entities of that type. It can also be the
instance name of an entity. The instance name should be the complete
hierarchical name. When specifying a level name from the hierarchy,
the instance name, not the type name, should be used. Each level in
the hierarchy should be separated by a '.', i.e. the syntax for
a complete hierarchical name is:
top_level_instance_name.next_level_name. ... .last_level_name
The port information given to an instance overrides the port
information of the library component.