def __init__(self, port, depth):
self.sink = Sink(dmatpl(depth))
self.source = Source(D_LAST)
self.busy = Signal()
self.pos = Signal(max=depth, reset=0)
self.pos_next = Signal(max=depth, reset=0)
self.ct = Signal(max=depth, reset=0)
self.ct_next = Signal(max=depth)
self.comb += [
self.ct_next.eq(self.ct),
self.pos_next.eq(self.pos),
port.adr.eq(self.pos_next),
]
self.sync += [
self.pos.eq(self.pos_next),
self.ct.eq(self.ct_next)
]
self.submodules.fsm = FSM()
self.fsm.act("IDLE",
self.busy.eq(0),
If(self.sink.stb,
self.busy.eq(1),
self.sink.ack.eq(1),
self.pos_next.eq(self.sink.payload.start),
self.ct_next.eq(self.sink.payload.count-1),
NextState('d'),
)
)
self.fsm.act("d",
self.busy.eq(1),
self.source.stb.eq(1),
self.source.payload.d.eq(port.dat_r),
If(self.ct == 0,
self.source.payload.last.eq(1)),
If(self.source.ack,
If(self.ct,
_inc(self.pos, depth, self.pos_next),
self.ct_next.eq(self.ct - 1),
).Else(
NextState("IDLE")
)
)
)
def __init__(self):
self.source = Source(dmatpl(1024))
SimActor.__init__(self, _deferred_src_gen())