diff --git a/litedram/core/multiplexer.py b/litedram/core/multiplexer.py
index 2e8eb68..a580633 100644
--- a/litedram/core/multiplexer.py
+++ b/litedram/core/multiplexer.py
@@ -136,10 +136,10 @@ class tXXDController(Module):
         # # #
 
         if txxd is not None:
-            count = Signal(max=max(txxd+1, 2))
+            count = Signal(max=max(txxd, 2))
             self.sync += \
                 If(valid,
-                    count.eq(txxd),
+                    count.eq(txxd-1),
                     If((txxd - 1) == 0,
                         ready.eq(1)
                     ).Else(