set_property PACKAGE_PIN P5 [get_ports a]
set_property PACKAGE_PIN P4 [get_ports b]
set_property PACKAGE_PIN P3 [get_ports c]
set_property PACKAGE_PIN G4 [get_ports y]
set_property IOSTANDARD LVCMOS33 [get_ports a]
set_property IOSTANDARD LVCMOS33 [get_ports b]
set_property IOSTANDARD LVCMOS33 [get_ports c]
set_property IOSTANDARD LVCMOS33 [get_ports y]