ICC unconnected port.

icfbicfb

for good habit , input pins should be tie to gnd if floating
output port can be floating ,

but it is not  a must action ,

you must write scripts to query ,
like

foreach_in_coll var [get_flat_cells ]  {
     foreach_in_coll  var2 [get_pins -of $var ] {
           set nets [get_nets -of  $var2   -quiet ]
            if XXXXXx

icfbicfb

to find the connected nets , if the net does not exist or  the net is just one pin ( connections
pin ==1 ) , then this pin is floating ,

icfbicfb

是吧哪个？