Rename fhdl→hdl, genlib→lib.

nmigen/lib/cdc.py

@@ -0,0 +1,25 @@
+from .. import *
+
+
+__all__ = ["MultiReg"]
+
+
+class MultiReg:
+    def __init__(self, i, o, odomain="sync", n=2, reset=0):
+        self.i = i
+        self.o = o
+        self.odomain = odomain
+
+        self._regs = [Signal(self.i.shape(), name="cdc{}".format(i),
+                             reset=reset, reset_less=True, attrs={"no_retiming": True})
+                      for i in range(n)]
+
+    def get_fragment(self, platform):
+        if hasattr(platform, "get_multi_reg"):
+            return platform.get_multi_reg(self)
+
+        m = Module()
+        for i, o in zip((self.i, *self._regs), self._regs):
+            m.d[self.odomain] += o.eq(i)
+        m.d.comb += self.o.eq(self._regs[-1])
+        return m.lower(platform)

nmigen/lib/io.py

@@ -0,0 +1,21 @@
+from .. import *
+
+
+__all__ = ["TSTriple"]
+
+
+class TSTriple:
+    def __init__(self, shape=None, min=None, max=None, reset_o=0, reset_oe=0, reset_i=0,
+                 name=None):
+        self.o  = Signal(shape, min=min, max=max, reset=reset_o,
+                         name=None if name is None else name + "_o")
+        self.oe = Signal(reset=reset_oe,
+                         name=None if name is None else name + "_oe")
+        self.i  = Signal(shape, min=min, max=max, reset=reset_i,
+                         name=None if name is None else name + "_i")
+
+    def __len__(self):
+        return len(self.o)
+
+    def get_fragment(self, platform):
+        return Fragment()