litex/examples/sim/abstract_transactions_lasmi.py

from migen.fhdl.std import *
from migen.bus.transactions import *
from migen.bus import lasmibus
from migen.sim.generic import run_simulation

def my_generator(n):
	bank = n % 4
	for x in range(4):
		t = TWrite(4*bank+x, 0x1000*bank + 0x100*x)
		yield t
		print("{0}: Wrote in {1} cycle(s)".format(n, t.latency))

	for x in range(4):
		t = TRead(4*bank+x)
		yield t
		print("{0}: Read {1:x} in {2} cycle(s)".format(n, t.data, t.latency))
		assert(t.data == 0x1000*bank + 0x100*x)

class MyModel(lasmibus.TargetModel):
	def read(self, bank, address):
		r = 0x1000*bank + 0x100*address
		#print("read from bank {0} address {1} -> {2:x}".format(bank, address, r))
		return r

	def write(self, bank, address, data, we):
		print("write to bank {0} address {1:x} data {2:x}".format(bank, address, data))
		assert(data == 0x1000*bank + 0x100*address)

class TB(Module):
	def __init__(self):
		self.submodules.controller = lasmibus.Target(MyModel(), aw=4, dw=32, nbanks=4, req_queue_size=4,
			read_latency=4, write_latency=1)
		self.submodules.xbar = lasmibus.Crossbar([self.controller.bus], 2)
		self.initiators = [lasmibus.Initiator(my_generator(n), self.xbar.get_master()) for n in range(4)]
		self.submodules += self.initiators

if __name__ == "__main__":
	run_simulation(TB())