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53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
from amaranth import *
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from amaranth.asserts import *
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from .. import PowerFVCheck
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from ... import pfv, tb
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__all__ = ["IAForwardSpec", "IAForwardCheck"]
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class IAForwardSpec(Elaboratable):
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"""IA forward specification.
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Given two instructions retiring in order, the NIA of the first must match the CIA
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of the second.
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"""
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def __init__(self, post):
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self.pfv = pfv.Interface()
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self.post = tb.Trigger(cycle=post)
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def triggers(self):
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yield self.post
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def elaborate(self, platform):
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m = Module()
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pred_order = AnyConst(self.pfv.order.width)
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pred_stb = Signal()
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pred_nia = Signal.like(self.pfv.nia)
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with m.If(self.pfv.stb & (self.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(self.pfv.nia)
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]
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with m.If(self.post.stb):
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m.d.sync += [
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Assume(self.pfv.stb),
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Assume(self.pfv.order == pred_order + 1),
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Assume(self.pfv.order > 0),
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Assert(pred_stb.implies(self.pfv.cia == pred_nia)),
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]
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return m
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class IAForwardCheck(PowerFVCheck, name="cons_ia_fwd"):
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def get_testbench(self, dut, post):
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tb_spec = IAForwardSpec(post)
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tb_top = tb.Testbench(tb_spec, dut)
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return tb_top
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