litex/gen/genlib/resetsync.py

   1 from litex.gen.fhdl.structure import *
   2 from litex.gen.fhdl.specials import Special
   3
   4
   5 class AsyncResetSynchronizer(Special):
   6     def __init__(self, cd, async_reset):
   7         Special.__init__(self)
   8         self.cd = cd
   9         self.async_reset = wrap(async_reset)
  10
  11     def iter_expressions(self):
  12         yield self.cd, "clk", SPECIAL_INPUT
  13         yield self.cd, "rst", SPECIAL_OUTPUT
  14         yield self, "async_reset", SPECIAL_INPUT
  15
  16     @staticmethod
  17     def lower(dr):
  18         raise NotImplementedError("Attempted to use a reset synchronizer, but platform does not support them")