def METHOD_NAME(self, fragment):
    XilinxUSPPlatform.METHOD_NAME(self, fragment)
    self.add_period_constraint(self.lookup_request("clk125", loose=True), 1e9/125e6)
    self.add_period_constraint(self.lookup_request("clk300", loose=True), 1e9/125e6)
    self.add_platform_command("set_property INTERNAL_VREF 0.84 [get_iobanks 64]")
    self.add_platform_command("set_property INTERNAL_VREF 0.84 [get_iobanks 65]")
    self.add_platform_command("set_property INTERNAL_VREF 0.84 [get_iobanks 66]")