def __init__(self, platform, clk_name, rst_name, period, rst_invert=False):
reset_less = rst_name is None
self.clock_domains.cd_sys = ClockDomain(reset_less=reset_less)
self._clk = platform.request(clk_name)
_add_period_constraint(platform, self._clk.p, period)
self.specials += Instance("IBUFGDS", Instance.Input("I", self._clk.p),
Instance.Input("IB", self._clk.n),
Instance.Output("O", self.cd_sys.clk))
if not reset_less:
if rst_invert:
self.comb += self.cd_sys.rst.eq(~platform.request(rst_name))
else:
self.comb += self.cd_sys.rst.eq(platform.request(rst_name))
