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53 lines
1.7 KiB
Python

from amaranth import *
from amaranth.asserts import *
__all__ = ["Testbench"]
def _check_triggers(t_start, t_pre, t_post):
if not isinstance(t_start, int) or t_start <= 0:
raise ValueError("t_start must be a positive integer, not {!r}"
.format(t_start))
if not isinstance(t_post, int) or t_post < t_start:
raise ValueError("t_post must be an integer greater than or equal to t_start ({}), not {!r}"
.format(t_start, t_post))
if not isinstance(t_pre, int) or t_pre > t_post or t_pre < t_start:
raise ValueError("t_pre must be an integer between t_start and t_post (i.e. [{},{}]), "
"not {!r}".format(t_pre, t_start, t_post))
class Testbench(Elaboratable):
def __init__(self, check, dut, *, t_start=1, t_pre=None, t_post=20):
if t_pre is None and t_post is not None:
t_pre = t_post
_check_triggers(t_start, t_pre, t_post)
self.check = check
self.dut = dut
self.t_start = t_start
self.t_pre = t_pre
self.t_post = t_post
def elaborate(self, platform):
m = Module()
timer = Signal(range(self.t_post + 2), reset=1)
with m.If(timer <= self.t_post):
m.d.sync += timer.eq(timer + 1)
m.submodules.check = ResetInserter(timer < self.t_start)(self.check)
m.submodules.dut = self.dut
m.d.comb += [
self.check.pre .eq(timer == self.t_pre),
self.check.post.eq(timer == self.t_post),
self.check.pfv .eq(self.dut.pfv),
]
m.d.comb += Assume(ResetSignal() == Initial())
return m