def METHOD_NAME(self, clock_domain):
    self._period = CSRStorage(32, reset_less=True, description="""PWM Period.\n
        Defines the *Period* of the PWM in ``{cd}_clk`` cycles.""".format(cd=clock_domain),
        reset = self.period.reset)
    n = 0 if clock_domain == "sys" else 2
    self.specials += MultiReg(self._period.storage, self.period, n=n)