litex/tb/asmicon/refresher.py

51 lines
1.2 KiB
Python
Raw Normal View History

2012-03-30 10:40:51 -04:00
from random import Random
from migen.fhdl.structure import *
from migen.sim.generic import Simulator, TopLevel
from migen.sim.icarus import Runner
from milkymist.asmicon.refresher import *
from common import CommandLogger
class Granter:
def __init__(self, req, ack):
self.req = req
self.ack = ack
self.state = 0
self.prng = Random(92837)
def do_simulation(self, s):
elts = ["@" + str(s.cycle_counter)]
if self.state == 0:
if s.rd(self.req):
elts.append("Refresher requested access")
self.state = 1
elif self.state == 1:
if self.prng.randrange(0, 5) == 0:
elts.append("Granted access to refresher")
s.wr(self.ack, 1)
self.state = 2
elif self.state == 2:
if not s.rd(self.req):
elts.append("Refresher released access")
s.wr(self.ack, 0)
self.state = 0
if len(elts) > 1:
print("\t".join(elts))
def get_fragment(self):
return Fragment(sim=[self.do_simulation])
def main():
dut = Refresher(13, 2, tRP=3, tREFI=100, tRFC=5)
logger = CommandLogger(dut.cmd)
granter = Granter(dut.req, dut.ack)
fragment = dut.get_fragment() + logger.get_fragment() + granter.get_fragment()
sim = Simulator(fragment, Runner())
sim.run(400)
main()