create_clock -name CLK -period 20 [get_ports {CLK}]

derive_clock_uncertainty

set_false_path -from [get_ports {altera_reserved_tck}] -to *
set_false_path -from [get_ports {altera_reserved_tdi}] -to *
set_false_path -from [get_ports {altera_reserved_tms}] -to *
set_false_path -from [get_ports {CLR}] -to *
set_false_path -from [get_ports {PB}] -to *

set_false_path -from * -to [get_ports {altera_reserved_tdo}]
set_false_path -from * -to [get_ports {LED}]