amaranth/nmigen/back/pysim.py

import warnings

from ..sim.pysim import *


__all__ = ["Settle", "Delay", "Tick", "Passive", "Active", "Simulator"]


# TODO(nmigen-0.4): remove
warnings.warn("instead of back.pysim, use sim.pysim",
              DeprecationWarning, stacklevel=2)
back.pysim: warn if simulation is not run. This would have prevented 3ea35b85. 2018-12-29 08:02:04 -07:00			`import warnings`
back.pysim: new simulator backend (WIP). 2018-12-13 11:00:05 -07:00
back.pysim→sim.pysim; split into more manageable parts. This is necessary to add cxxrtl as an alternate simulation engine. 2020-07-08 06:49:38 -06:00			`from ..sim.pysim import *`
back.pysim: new simulator backend (WIP). 2018-12-13 11:00:05 -07:00

back.pysim: extract simulator commands to sim._cmds. NFC. 2020-07-07 23:42:33 -06:00			`__all__ = ["Settle", "Delay", "Tick", "Passive", "Active", "Simulator"]`
back.pysim: redesign the simulator. The redesign introduces no fundamental incompatibilities, but it does involve minor breaking changes: * The simulator commands were moved from hdl.ast to back.pysim (instead of only being reexported from back.pysim). * back.pysim.DeadlineError was removed. Summary of changes: * The new simulator compiles HDL to Python code and is >6x faster. (The old one compiled HDL to lots of Python lambdas.) * The new simulator is a straightforward, rigorous implementation of the Synchronous Reactive Programming paradigm, instead of a pile of ad-hoc code with no particular design driving it. * The new simulator never raises DeadlineError, and there is no limit on the amount of delta cycles. * The new simulator robustly handles multiclock designs. * The new simulator can be reset, such that the compiled design can be reused, which can save significant runtime with large designs. * Generators can no longer be added as processes, since that would break reset(); only generator functions may be. If necessary, they may be added by wrapping them into a generator function; a deprecated fallback does just that. This workaround will raise an exception if the simulator is reset and restarted. * The new simulator does not depend on Python extensions. (The old one required bitarray, which did not provide wheels.) Fixes #28. Fixes #34. Fixes #160. Fixes #161. Fixes #215. Fixes #242. Fixes #262. 2019-11-22 01:32:41 -07:00

back.pysim→sim.pysim; split into more manageable parts. This is necessary to add cxxrtl as an alternate simulation engine. 2020-07-08 06:49:38 -06:00			`# TODO(nmigen-0.4): remove`
			`warnings.warn("instead of back.pysim, use sim.pysim",`
			`DeprecationWarning, stacklevel=2)`