actorlib/structuring/Pipeline: make 'busy' a signal

diff --git a/migen/actorlib/structuring.py b/migen/actorlib/structuring.py
index 24199aca59c1b17fa42e33ac497cb78447b50afa..ce465578b068b0cf995172bfc44b26d3d8c3d528 100644 (file)
--- a/migen/actorlib/structuring.py
+++ b/migen/actorlib/structuring.py
@@ -199,14 +199,13 @@ class Converter(Module):
 
 class Pipeline(Module):
        def __init__(self, *modules):
+               self.busy = Signal()
                n = len(modules)
                m = modules[0]
                # expose sink of first module
                # if available
                if hasattr(m, "sink"):
                        self.sink = m.sink
-               # use of busy is encouraged
-               # but not mandatory
                if hasattr(m, "busy"):
                        busy = m.busy
                else:
@@ -224,4 +223,4 @@ class Pipeline(Module):
                # if available
                if hasattr(m, "source"):
                        self.source = m.source
-               self.busy = busy
+               self.comb += self.busy.eq(busy)