diff --git a/sol_usb/gateware/interface/ulpi.py b/sol_usb/gateware/interface/ulpi.py
index c1dfec57..556c6d98 100644
--- a/sol_usb/gateware/interface/ulpi.py
+++ b/sol_usb/gateware/interface/ulpi.py
@@ -22,9 +22,21 @@ class UPLIDataRecord(Record):
 	o: Signal
 	oe: Signal
 
+	def __init__(self):
+		super().__init__([
+			('i', 8, DIR_FANIN),
+			('o', 8, DIR_FANOUT),
+			('oe', 8, DIR_FANOUT),
+		])
+
 class UPLIDirRecord(Record):
 	i: Signal
 
+	def __init__(self):
+		super().__init__([
+			('i', 1, DIR_FANIN),
+		])
+
 class ULPIInterface(Record):
 	''' Record that represents a standard ULPI interface. '''
 
@@ -770,6 +782,8 @@ def __init__(self, *, ulpi, use_platform_registers = True, handle_clocking = Tru
 
 		'''
 
+		super().__init__()
+
 		self.use_platform_registers = use_platform_registers
 		self.handle_clocking        = handle_clocking