Super Long Line (SLL) routes connect signals from one SLR to another inside the device.
Tip: To determine the number of available
SLLs between SLRs, use SLR properties. For example:
get_property NUM_TOP_SLLS [get_slrs SLR0]
get_property NUM_BOT_SLLS [get_slrs SLR1]
get_property NUM_LEFT_SLLS [get_slrs SLR3]
get_property NUM_RIGHT_SLLS [get_slrs SLR0]