examples/sim: add LASMI demo

examples/sim/abstract_transactions_lasmi.py

@@ -0,0 +1,40 @@
+from migen.fhdl.std import *
+from migen.bus.transactions import *
+from migen.bus import lasmibus
+from migen.sim.generic import Simulator
+
+def my_generator(n):
+	for x in range(4):
+		t = TWrite(4*n+x, 0x100+x)
+		yield t
+		print("Wrote in {0} cycle(s)".format(t.latency))
+		
+	for x in range(4):
+		t = TRead(4*n+x)
+		yield t
+		print("Read {0:x} in {1:x} cycle(s)".format(t.data, t.latency))
+
+class MyModel(lasmibus.TargetModel):
+	def read(self, bank, address):
+		#print("read from bank {0} address {1}".format(bank, address))
+		return 0x1000*bank + 0x200+address
+	
+	def write(self, bank, address, data, we):
+		print("write to bank {0} address {1:x} data {2:x}".format(bank, address, data))
+
+class TB(Module):
+	def __init__(self):
+		self.submodules.controller = lasmibus.Target(MyModel(), aw=4, dw=32, nbanks=4, read_latency=4, write_latency=1)
+		self.submodules.xbar = lasmibus.Crossbar([self.controller.bus], 4, 2)
+		self.initiators = [lasmibus.Initiator(my_generator(n), bus) for n, bus in enumerate(self.xbar.masters)]
+		self.submodules += self.initiators
+
+	def do_simulation(self, s):
+		s.interrupt = all(m.done for m in self.initiators)
+
+def main():
+	tb = TB()
+	sim = Simulator(tb)
+	sim.run()
+	
+main()