You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
1.5 KiB
Python
67 lines
1.5 KiB
Python
from amaranth import *
|
|
from amaranth.asserts import *
|
|
|
|
from .. import pfv
|
|
|
|
|
|
__all__ = ["UniquenessCheck", "UniquenessCover"]
|
|
|
|
|
|
class UniquenessCheck(Elaboratable):
|
|
"""Uniqueness check.
|
|
|
|
Check that the core cannot retire two instructions with the same `pfv.order` identifier.
|
|
"""
|
|
def __init__(self):
|
|
self.pre = Signal()
|
|
self.post = Signal()
|
|
self.pfv = pfv.Interface()
|
|
|
|
def elaborate(self, platform):
|
|
m = Module()
|
|
|
|
spec_order = AnyConst(self.pfv.order.shape())
|
|
duplicate = Signal()
|
|
|
|
with m.If(self.pre):
|
|
m.d.sync += [
|
|
Assume(self.pfv.stb),
|
|
Assume(spec_order == self.pfv.order),
|
|
Assume(~duplicate),
|
|
]
|
|
with m.Elif(self.pfv.stb & (self.pfv.order == spec_order)):
|
|
m.d.sync += duplicate.eq(1)
|
|
|
|
with m.If(self.post):
|
|
m.d.sync += Assert(~duplicate)
|
|
|
|
return m
|
|
|
|
|
|
class UniquenessCover(Elaboratable):
|
|
def __init__(self):
|
|
self.pre = Signal()
|
|
self.post = Signal()
|
|
self.pfv = pfv.Interface()
|
|
|
|
def elaborate(self, platform):
|
|
m = Module()
|
|
|
|
insn_count = Signal(range(4))
|
|
|
|
with m.If(self.pfv.stb):
|
|
m.d.sync += insn_count.eq(insn_count + 1)
|
|
|
|
cover_1 = Signal()
|
|
cover_2 = Signal()
|
|
|
|
m.d.comb += [
|
|
cover_1.eq(insn_count == 1),
|
|
cover_2.eq(insn_count == 2),
|
|
|
|
Cover(cover_1),
|
|
Cover(cover_2),
|
|
]
|
|
|
|
return m
|