From 493b181af1e3a3dd889b1923e9295d058cce4e45 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Mon, 21 May 2012 22:55:23 +0200
Subject: [PATCH] bank/description: pad unaligned multi-word registers at the
 top

---
 migen/bank/description.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/migen/bank/description.py b/migen/bank/description.py
index 4c9b5b6d..01d59017 100644
--- a/migen/bank/description.py
+++ b/migen/bank/description.py
@@ -61,6 +61,13 @@ def expand_description(description, busword):
 			for field in reg.fields:
 				size += field.size
 				if size > busword:
+					# add padding
+					totalsize = sum([field.size for field in reg.fields])
+					padding = busword - (totalsize % busword)
+					if padding == busword:
+						padding = 0
+					size += padding
+					
 					top = field.size
 					while size > busword:
 						slice1 = busword - size + top
-- 
2.30.2