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.
50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
from amaranth import *
|
|
from amaranth.asserts import *
|
|
|
|
from .. import PowerFVCheck
|
|
from ... import pfv, tb
|
|
|
|
|
|
__all__ = ["UniquenessSpec", "UniquenessCheck"]
|
|
|
|
|
|
class UniquenessSpec(Elaboratable):
|
|
"""Uniqueness specification.
|
|
|
|
A core cannot retire two instructions that share the same `pfv.order` identifier.
|
|
"""
|
|
def __init__(self, pre, post):
|
|
self.pfv = pfv.Interface()
|
|
self.pre = tb.Trigger(cycle=pre)
|
|
self.post = tb.Trigger(cycle=post)
|
|
|
|
def triggers(self):
|
|
yield from (self.pre, self.post)
|
|
|
|
def elaborate(self, platform):
|
|
m = Module()
|
|
|
|
spec_order = AnyConst(self.pfv.order.shape())
|
|
duplicate = Signal()
|
|
|
|
with m.If(self.pre.stb):
|
|
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.stb):
|
|
m.d.sync += Assert(~duplicate)
|
|
|
|
return m
|
|
|
|
|
|
class UniquenessCheck(PowerFVCheck, name="cons_unique"):
|
|
def get_testbench(self, dut, pre, post):
|
|
tb_spec = UniquenessSpec(pre, post)
|
|
tb_top = tb.Testbench(tb_spec, dut)
|
|
return tb_top
|