set_property PACKAGE_PIN N15 [get_ports o]
set_property PACKAGE_PIN N16 [get_ports o2]
set_property PACKAGE_PIN P17 [get_ports o3]
set_property PACKAGE_PIN R17 [get_ports o4]

set_property IOSTANDARD LVCMOS33 [get_ports o]
set_property IOSTANDARD LVCMOS33 [get_ports o2]
set_property IOSTANDARD LVCMOS33 [get_ports o3]
set_property IOSTANDARD LVCMOS33 [get_ports o4]