common: move tXXDController to common

litedram/common.py

@@ -167,3 +167,27 @@ def cmd_request_rw_layout(a, ba):
         ("is_read", 1),
         ("is_write", 1)
     ]
+
+
+class tXXDController(Module):
+    def __init__(self, txxd):
+        self.valid = valid = Signal()
+        self.ready = ready = Signal(reset=1)
+        ready.attr.add("no_retiming")
+
+        # # #
+
+        if txxd is not None:
+            count = Signal(max=max(txxd, 2))
+            self.sync += \
+                If(valid,
+                    count.eq(txxd-1),
+                    If((txxd - 1) == 0,
+                        ready.eq(1)
+                    ).Else(
+                        ready.eq(0)
+                    )
+                ).Elif(~ready,
+                    count.eq(count - 1),
+                    If(count == 1, ready.eq(1))
+                )

litedram/core/multiplexer.py

@@ -133,30 +133,6 @@ class _Steerer(Module):
             ]
 
 
-class tXXDController(Module):
-    def __init__(self, txxd):
-        self.valid = valid = Signal()
-        self.ready = ready = Signal(reset=1)
-        ready.attr.add("no_retiming")
-
-        # # #
-
-        if txxd is not None:
-            count = Signal(max=max(txxd, 2))
-            self.sync += \
-                If(valid,
-                    count.eq(txxd-1),
-                    If((txxd - 1) == 0,
-                        ready.eq(1)
-                    ).Else(
-                        ready.eq(0)
-                    )
-                ).Elif(~ready,
-                    count.eq(count - 1),
-                    If(count == 1, ready.eq(1))
-                )
-
-
 class tFAWController(Module):
     def __init__(self, tfaw):
         self.valid = valid = Signal()