litex/lib/sata/test/common.py

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2014-12-02 15:34:16 -05:00
import random
from lib.sata.std import *
def seed_to_data(seed, random=True):
if random:
return (seed * 0x31415979 + 1) & 0xffffffff
else:
return seed
def check(ref, res):
if isinstance(ref, int):
return 0, 1, int(ref != res)
else:
shift = 0
while((ref[0] != res[0]) and (len(res)>1)):
res.pop(0)
shift += 1
length = min(len(ref), len(res))
errors = 0
for i in range(length):
if ref.pop(0) != res.pop(0):
errors += 1
return shift, length, errors
2014-12-02 15:34:16 -05:00
def randn(max_n):
return random.randint(0, max_n-1)
class AckRandomizer(Module):
def __init__(self, description, level=0):
self.level = level
self.sink = Sink(description)
self.source = Source(description)
self.run = Signal()
self.comb += \
If(self.run,
Record.connect(self.sink, self.source)
).Else(
self.source.stb.eq(0),
self.sink.ack.eq(0),
)
def do_simulation(self, selfp):
n = randn(100)
if n < self.level:
selfp.run = 0
else:
selfp.run = 1