diff --git a/litedram/core/.multiplexer.py.swp b/litedram/core/.multiplexer.py.swp
new file mode 100644
index 0000000..35e792a
Binary files /dev/null and b/litedram/core/.multiplexer.py.swp differ
diff --git a/litedram/core/multiplexer.py b/litedram/core/multiplexer.py
index 66a60fe..10f69b4 100644
--- a/litedram/core/multiplexer.py
+++ b/litedram/core/multiplexer.py
@@ -136,7 +136,7 @@ class tXXDController(Module):
         # # #
 
         if txxd is not None:
-            count = Signal(max=max(txxd, 2))
+            count = Signal(max=max(txxd+1, 2))
             self.sync += \
                 If(valid,
                     count.eq(txxd),