diff --git a/migen/bus/dfi.py b/migen/bus/dfi.py
index b6f407d5c..f965ecdc9 100644
--- a/migen/bus/dfi.py
+++ b/migen/bus/dfi.py
@@ -24,6 +24,11 @@ class Interface:
 	def __init__(self, a, ba, d, nphases=1):
 		self.pdesc = phase_description(a, ba, d)
 		self.phases = [SimpleInterface(self.pdesc) for i in range(nphases)]
+		for p in self.phases:
+			p.cas_n.reset = Constant(1)
+			p.cs_n.reset = Constant(1)
+			p.ras_n.reset = Constant(1)
+			p.we_n.reset = Constant(1)
 	
 	# Returns pairs (DFI-mandated signal name, Migen signal object)
 	def get_standard_names(self, m2s=True, s2m=True):