set_io pin_led   B3
set_io pin_usb_p B4
set_io pin_usb_n A4
set_io pin_pu    A3
set_io pin_clk   B2

# Your debug pins might be different
set_io --warn-no-port debug[0] H9   # Pin_14
set_io --warn-no-port debug[1] D9   # Pin_15
set_io --warn-no-port debug[2] D8   # Pin_16
set_io --warn-no-port debug[3] C9   # Pin_17