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drtio/transceiver/gth: implement tx multi lane phase alignment sequence

This commit is contained in:
Florent Kermarrec 2018-02-22 22:13:29 +01:00
parent bc5e949bb4
commit 820c834251
1 changed files with 68 additions and 8 deletions

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@ -1,5 +1,5 @@
from functools import reduce
from operator import or_
from operator import or_, and_
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
@ -16,7 +16,18 @@ from artiq.gateware.drtio.transceiver.gth_ultrascale_init import *
class GTHSingle(Module):
def __init__(self, refclk, pads, sys_clk_freq, rtio_clk_freq, dw, mode):
assert (dw == 20) or (dw == 40)
assert mode in ["master", "slave"]
assert mode in ["single", "master", "slave"]
self.mode = mode
# phase alignment
self.txsyncallin = Signal()
self.txphaligndone = Signal()
self.txsyncallin = Signal()
self.txsyncin = Signal()
self.txsyncout = Signal()
self.txdlysreset = Signal()
# # #
nwords = dw//10
self.submodules.encoder = encoder = ClockDomainsRenamer("rtio_tx")(
@ -96,11 +107,16 @@ class GTHSingle(Module):
# TX Startup/Reset
i_GTTXRESET=tx_init.gtXxreset,
o_TXRESETDONE=tx_init.Xxresetdone,
i_TXDLYSRESET=tx_init.Xxdlysreset,
i_TXDLYSRESET=tx_init.Xxdlysreset if mode != "slave" else self.txdlysreset,
o_TXDLYSRESETDONE=tx_init.Xxdlysresetdone,
o_TXPHALIGNDONE=tx_init.Xxphaligndone,
i_TXUSERRDY=tx_init.Xxuserrdy,
i_TXSYNCMODE=1,
i_TXSYNCMODE=mode != "slave",
p_TXSYNC_MULTILANE=0 if mode == "single" else 1,
p_TXSYNC_OVRD=0,
i_TXSYNCALLIN=self.txsyncallin,
i_TXSYNCIN=self.txsyncin,
o_TXSYNCOUT=self.txsyncout,
# TX data
p_TX_DATA_WIDTH=dw,
@ -172,6 +188,7 @@ class GTHSingle(Module):
o_GTHTXP=pads.txp,
o_GTHTXN=pads.txn
)
self.comb += self.txphaligndone.eq(tx_init.Xxphaligndone)
self.submodules += [
add_probe_async("drtio_gth", "cpll_lock", cpll_lock),
@ -221,6 +238,44 @@ class GTHSingle(Module):
self.submodules += add_probe_async("drtio_gth", "clock_aligner_ready", clock_aligner.ready)
class GTHTXPhaseAlignement(Module):
# TX Buffer Bypass in Single-Lane/Multi-Lane Auto Mode (ug576)
def __init__(self, gths):
txsyncallin = Signal()
txsync = Signal()
txphaligndone = Signal(len(gths))
txdlysreset = Signal()
ready_for_align = Signal(len(gths))
all_ready_for_align = Signal()
for i, gth in enumerate(gths):
# Common to all transceivers
self.comb += [
ready_for_align[i].eq(1),
gth.txsyncin.eq(txsync),
gth.txsyncallin.eq(txsyncallin),
txphaligndone[i].eq(gth.txphaligndone)
]
# Specific to Master or Single transceivers
if gth.mode == "master" or gth.mode == "single":
self.comb += [
gth.tx_init.all_ready_for_align.eq(all_ready_for_align),
txsync.eq(gth.txsyncout),
txdlysreset.eq(gth.tx_init.Xxdlysreset)
]
# Specific to Slave transceivers
else:
self.comb += [
ready_for_align[i].eq(gth.tx_init.ready_for_align),
gth.txdlysreset.eq(txdlysreset),
]
self.comb += [
txsyncallin.eq(reduce(and_, [txphaligndone[i] for i in range(len(gths))])),
all_ready_for_align.eq(reduce(and_, [ready_for_align[i] for i in range(len(gths))]))
]
class GTH(Module, TransceiverInterface):
def __init__(self, clock_pads, data_pads, sys_clk_freq, rtio_clk_freq, dw=20, master=0):
self.nchannels = nchannels = len(data_pads)
@ -238,18 +293,23 @@ class GTH(Module, TransceiverInterface):
rtio_tx_clk = Signal()
channel_interfaces = []
for i in range(nchannels):
mode = "master" if i == master else "slave"
gth = GTHSingle(refclk, data_pads[i], sys_clk_freq, rtio_clk_freq, dw, mode)
if mode == "master":
self.comb += rtio_tx_clk.eq(gth.cd_rtio_tx.clk)
if nchannels == 1:
mode = "single"
else:
mode = "master" if i == master else "slave"
gth = GTHSingle(plls[i], tx_pads[i], rx_pads[i], sys_clk_freq, dw, mode)
if mode == "slave":
self.comb += gth.cd_rtio_tx.clk.eq(rtio_tx_clk)
else:
self.comb += rtio_tx_clk.eq(gth.cd_rtio_tx.clk)
self.gths.append(gth)
setattr(self.submodules, "gth"+str(i), gth)
channel_interface = ChannelInterface(gth.encoder, gth.decoders)
self.comb += channel_interface.rx_ready.eq(gth.rx_ready)
channel_interfaces.append(channel_interface)
self.submodules.tx_phase_alignment = GTHTXPhaseAlignement(self.gths)
TransceiverInterface.__init__(self, channel_interfaces)
# GTH PLLs recover on their own from an interrupted clock input.
# stable_clkin can be ignored.