litex/tb/asmicon/selector.py

77 lines
1.9 KiB
Python

from random import Random
from migen.fhdl.std import *
from migen.bus.asmibus import *
from migen.sim.generic import Simulator, TopLevel
from milkymist.asmicon.bankmachine import _AddressSlicer, _SimpleSelector
from common import SlotsLogger, sdram_geom
def my_generator(dt, offset):
for t in range(dt):
yield None
for x in range(10):
t = TRead(x + offset)
yield t
class Selector:
def __init__(self, slicer, bankn, slots):
self.selector = _SimpleSelector(slicer, bankn, slots)
self.queue = []
self.prng = Random(876)
def do_simulation(self, s):
if self.prng.randrange(0, 5):
s.wr(self.selector.ack, 1)
else:
s.wr(self.selector.ack, 0)
if s.rd(self.selector.stb) and s.rd(self.selector.ack):
tag = s.rd(self.selector.tag)
self.queue.append(tag)
print("==> SELECTED: " + str(tag))
print("")
def get_fragment(self):
return self.selector.get_fragment() + \
Fragment(sim=[self.do_simulation])
class Completer:
def __init__(self, hub, queue):
self.hub = hub
self.queue = queue
def do_simulation(self, s):
if self.queue:
tag = self.queue.pop()
s.wr(self.hub.call, 1)
s.wr(self.hub.tag_call, tag)
else:
s.wr(self.hub.call, 0)
def get_fragment(self):
return Fragment(sim=[self.do_simulation])
def main():
hub = Hub(12, 128, 8)
initiators = [Initiator(hub.get_port(), my_generator(0, 2200*(i//6)+i*10))
for i in range(8)]
hub.finalize()
slots = hub.get_slots()
slicer = _AddressSlicer(sdram_geom, 2)
logger = SlotsLogger(slicer, slots)
selector = Selector(slicer, 0, slots)
completer = Completer(hub, selector.queue)
def end_simulation(s):
s.interrupt = all([i.done for i in initiators])
fragment = hub.get_fragment() + sum([i.get_fragment() for i in initiators], Fragment()) + \
logger.get_fragment() + selector.get_fragment() + completer.get_fragment() + \
Fragment(sim=[end_simulation])
sim = Simulator(fragment, TopLevel("my.vcd"))
sim.run()
main()