import os, textwrap
from enum import Enum, auto
-from nmigen import *
-from nmigen.build import *
-from nmigen.lib.io import *
+from nmigen import (Elaboratable, Signal, Module, ClockDomain, Cat, Record,
+ Const, Mux)
from nmigen.hdl.rec import Direction, Layout
from nmigen.tracer import get_var_name