two_phase_clk                                      Defines a two-phase clock.
 [  object ]                                         design units/current scope
 [ -tree ]                                           Applies the constraint to
                                                     all levels of hierarchy
                                                     below the object(s)
                                                     specified.
 -master                    master
 [ -masterlevel             active_level ]           1, 0 /1
 -slave                     slave
 [ -slavelevel              active_level ]           1, 0 /1
 -reference                 reference
 [ -control                 control ]                1, 0 /1
