set_property IOSTANDARD LVCMOS33 [get_ports led_of]
set_property IOSTANDARD LVCMOS33 [get_ports led_ok]
set_property IOSTANDARD LVCMOS33 [get_ports led_uf]
set_property PACKAGE_PIN U16 [get_ports led_of]
set_property PACKAGE_PIN E19 [get_ports led_ok]
set_property PACKAGE_PIN U19 [get_ports led_uf]