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57 lines
1.5 KiB
Python
57 lines
1.5 KiB
Python
from amaranth import *
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from amaranth.asserts import *
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from power_fv.check import PowerFVCheck
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from power_fv.check._timer import Timer
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__all__ = ["CIACheck"]
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class CIACheck(PowerFVCheck, name=("cia",)):
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"""CIA check.
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Given a pair of instructions retiring in order, the CIA of the second must match the NIA
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of the first.
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"""
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def testbench(self):
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return CIATestbench(self)
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class CIATestbench(Elaboratable):
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def __init__(self, check):
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if not isinstance(check, CIACheck):
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raise TypeError("Check must be an instance of CIACheck, not {!r}"
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.format(check))
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self.check = check
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self.name = "cia_tb"
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def elaborate(self, platform):
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m = Module()
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m.submodules.t_post = t_post = Timer(self.check.depth - 1)
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m.submodules.dut = dut = self.check.dut
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pred_stb = Signal()
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pred_order = Signal(unsigned(64))
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pred_nia = Signal(unsigned(64))
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m.d.comb += pred_order.eq(AnyConst(64))
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with m.If(dut.pfv.stb & (dut.pfv.order == pred_order)):
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m.d.sync += [
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pred_stb.eq(1),
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pred_nia.eq(dut.pfv.nia)
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]
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with m.If(t_post.zero):
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m.d.comb += [
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Assume(dut.pfv.stb),
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Assume(dut.pfv.order == pred_order + 1),
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Assume(dut.pfv.order > 0),
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Assert(pred_stb.implies(dut.pfv.cia == pred_nia)),
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]
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return m
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