actorlib: add fifo

migen/actorlib/fifo.py

@@ -0,0 +1,41 @@
+from migen.fhdl.std import *
+from migen.flow.actor import *
+from migen.genlib import fifo
+
+def FIFOWrapper(sink, source, fifo):
+	return [
+			sink.ack.eq(fifo.writable),
+			fifo.we.eq(sink.stb & sink.ack),
+			fifo.din.eq(sink.payload),
+
+			source.stb.eq(fifo.readable),
+			source.payload.eq(fifo.dout),
+			fifo.re.eq(source.ack)
+	]
+
+class SyncFIFO(Module):
+	def __init__(self, layout, depth):
+
+		self.sink = Sink(layout)
+		self.source = Source(layout)
+		self.busy = Signal()
+
+		_fifo = fifo.SyncFIFO(layout, depth)		
+
+		self.submodules += _fifo
+
+		self.comb += FIFOWrapper(self.sink, self.source, _fifo)
+
+class AsyncFIFO(Module):
+	def __init__(self, layout, depth, cd_write="write", cd_read="read"):
+
+		self.sink = Sink(layout)
+		self.source = Source(layout)
+		self.busy = Signal()
+
+		_fifo = RenameClockDomains(fifo.AsyncFIFO(layout, depth),
+			{"write": cd_write, "read": cd_read})
+		self.submodules += _fifo
+
+		self.comb += FIFOWrapper(self.sink, self.source, _fifo)
+