genlib/misc: add FlipFlop, Counter, Timeout

diff --git a/migen/genlib/misc.py b/migen/genlib/misc.py
index 3f5cebad245cc0451a23f6aa21bceadcc72e77cd..340de13a9acdb58392fa1dc20e8345b5b2fb81d0 100644 (file)
--- a/migen/genlib/misc.py
+++ b/migen/genlib/misc.py
@@ -85,3 +85,29 @@ def timeline(trigger, events):
        sync = [If(get_cond(e), *e[1]) for e in events]
        sync.append(counterlogic)
        return sync
+
+@DecorateModule(InsertReset)
+@DecorateModule(InsertCE)
+class FlipFlop(Module):
+       def __init__(self, *args, **kwargs):
+               self.d = Signal(*args, **kwargs)
+               self.q = Signal(*args, **kwargs)
+               self.sync += self.q.eq(self.d)
+
+@DecorateModule(InsertReset)
+@DecorateModule(InsertCE)
+class Counter(Module):
+       def __init__(self, *args, **kwargs):
+               self.value = Signal(**kwargs)
+               self.width = flen(self.value)
+               self.sync += self.value.eq(self.value+1)
+
+@DecorateModule(InsertReset)
+@DecorateModule(InsertCE)
+class Timeout(Module):
+       def __init__(self, length):
+               self.reached = Signal()
+               ###
+               value = Signal(max=length)
+               self.sync += If(~self.reached, value.eq(value+1))
+               self.comb += self.reached.eq(value == (length-1))