nmigen/sim/_cmds.py

   1 from ..hdl.cd import *
   2
   3
   4 __all__ = ["Settle", "Delay", "Tick", "Passive", "Active"]
   5
   6
   7 class Command:
   8     pass
   9
  10
  11 class Settle(Command):
  12     def __repr__(self):
  13         return "(settle)"
  14
  15
  16 class Delay(Command):
  17     def __init__(self, interval=None):
  18         self.interval = None if interval is None else float(interval)
  19
  20     def __repr__(self):
  21         if self.interval is None:
  22             return "(delay ε)"
  23         else:
  24             return "(delay {:.3}us)".format(self.interval * 1e6)
  25
  26
  27 class Tick(Command):
  28     def __init__(self, domain="sync"):
  29         if not isinstance(domain, (str, ClockDomain)):
  30             raise TypeError("Domain must be a string or a ClockDomain instance, not {!r}"
  31                             .format(domain))
  32         assert domain != "comb"
  33         self.domain = domain
  34
  35     def __repr__(self):
  36         return "(tick {})".format(self.domain)
  37
  38
  39 class Passive(Command):
  40     def __repr__(self):
  41         return "(passive)"
  42
  43
  44 class Active(Command):
  45     def __repr__(self):
  46         return "(active)"