#      
###################################################################
# In each of TOP()/BOTTOM()/LEFT()/RIGHT() section, there are     #
# placed IOs. In the IGNORE() section, the IOs are ignored        #
# by the IOPlacer. In every section, the IO syntax could be:      #
#        for pin:       (IOPIN iopinName.0 );                       #
#        for pad:       iopadName orientation ;                   #
#        for space:     SPACE  value;                             #
# The capital words are keywords. orientation is not required.    #
# The value is the space between the IO above and the IO below it.#
###################################################################

TOP ( # IOs are ordered from left to right
   (IOPIN a(3).0 );
   (IOPIN a(2).0 );
   (IOPIN a(1).0 );
   (IOPIN a(0).0 );
   (IOPIN b(3).0 );
   (IOPIN b(2).0 );
   (IOPIN b(1).0 );
   (IOPIN b(0).0 );
)
BOTTOM ( # IOs are ordered from left to right
   (IOPIN result(3).0 );
   (IOPIN result(2).0 );
   (IOPIN result(1).0 );
   (IOPIN result(0).0 );
)
IGNORE ( # IOs are ignored(not placed) by IO Placer
)
