drtio: add full link layer

This commit is contained in:
Sebastien Bourdeauducq 2016-09-27 21:41:57 +08:00
parent 08772f7a71
commit cefb9e1405
1 changed files with 56 additions and 0 deletions

View File

@ -206,3 +206,59 @@ class LinkLayerRX(Module):
self.remote_rx_ready.eq(0)
)
]
class LinkLayer(Module):
def __init__(self, encoder, decoders):
self.reset = Signal()
self.ready = Signal()
# pulsed to reset receiver, rx_ready must immediately go low
self.rx_reset = Signal()
# receiver locked including comma alignment
self.rx_ready = Signal()
tx = LinkLayerTX(encoder)
rx = LinkLayerRX(decoders)
self.submodules += tx, rx
self.tx_aux_frame = tx.aux_frame
self.tx_aux_data = tx.aux_data
self.tx_aux_ack = tx.aux_ack
self.tx_rt_frame = tx.rt_frame
self.tx_rt_data = tx.rt_data
self.rx_aux_stb = rx.aux_stb
self.rx_aux_frame = rx.aux_frame
self.rx_aux_data = rx.aux_data
self.rx_rt_frame = rx.rt_frame
self.rx_rt_data = rx.rt_data
# # #
fsm = ResetInserter()(FSM(reset_state="RESET_RX"))
self.submodules += fsm
self.comb += fsm.reset.eq(self.reset)
fsm.act("RESET_RX",
tx.link_init.eq(1),
self.rx_reset.eq(1),
NextState("WAIT_LOCAL_RX_READY")
)
fsm.act("WAIT_LOCAL_RX_READY",
tx.link_init.eq(1),
If(self.rx_ready,
NextState("WAIT_REMOTE_RX_READY")
)
)
fsm.act("WAIT_REMOTE_RX_READY",
tx.link_init.eq(1),
tx.signal_rx_ready.eq(1),
If(rx.remote_rx_ready,
NextState("READY")
)
)
fsm.act("READY",
self.ready.eq(1)
)