From 1665f293a619b6b989031fb5b293df9509f57600 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Wed, 14 Mar 2012 16:19:29 +0100
Subject: [PATCH] bus/asmibus/hub: require finalization before get_slots

---
 migen/bus/asmibus.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/migen/bus/asmibus.py b/migen/bus/asmibus.py
index 77723b674..3d4ed415f 100644
--- a/migen/bus/asmibus.py
+++ b/migen/bus/asmibus.py
@@ -146,6 +146,8 @@ class Hub:
 		self.tag_call = Signal(BV(tagbits))
 	
 	def get_slots(self):
+		if not self.finalized:
+			raise FinalizeError
 		return sum([port.slots for port in self.ports], [])
 	
 	def get_fragment(self):