def get_fragment(self):
		n = len(self.endpoints)
		acked = Signal(BV(n), name="acked")
	
		sink = self.endpoints["sink"]
		sources = [self.endpoints["source{0}".format(n)]
			for n in range(len(self.endpoints)-1)]
		comb = [sink.ack.eq(optree('&', [source.ack | acked[n] for n, source in enumerate(sources)]))]
		comb += [source.stb.eq(sink.stb) for source in sources]

		sync = [If(sink.stb & sink.ack, acked.eq(0)).Else(
			*[If(source.ack, acked[n].eq(1)) for n, source in
			enumerate(sources)])]

		return Fragment(comb, sync)