genlib/fifo: add test bench

migen/genlib/fifo.py

@@ -129,3 +129,28 @@ class AsyncFIFO(Module, _FIFOInterface):
 			rdport.adr.eq(consume.q_binary[:-1]),
 			self.dout_bits.eq(rdport.dat_r)
 		]
+
+class _SyncFIFOTB(Module):
+	def __init__(self):
+		self.submodules.dut = SyncFIFO([("a", 32), ("b", 32)], 2)
+
+		self.sync += [
+			If(self.dut.we & self.dut.writable, 
+				self.dut.din.a.eq(self.dut.din.a + 1),
+				self.dut.din.b.eq(self.dut.din.b + 2)
+			)
+		]
+		
+	def do_simulation(self, s):
+		s.wr(self.dut.we, s.cycle_counter % 4 == 0)
+		s.wr(self.dut.re, s.cycle_counter % 3 == 0)
+		print("readable: {0} re: {1} data: {2}/{3}".format(s.rd(self.dut.readable),
+			s.rd(self.dut.re),
+			s.rd(self.dut.dout.a), s.rd(self.dut.dout.b)))
+
+def _main():
+	from migen.sim.generic import Simulator
+	Simulator(_SyncFIFOTB()).run(20)
+
+if __name__ == "__main__":
+	_main()