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serwb: new version using only sys/sys4x clocks domains, scrambling deactivated.

This commit is contained in:
Florent Kermarrec 2018-04-07 02:59:14 +02:00
parent dd21c07b85
commit 73b727cade
6 changed files with 210 additions and 213 deletions
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32
artiq/gateware/serwb/core.py
View File

@ -17,37 +17,37 @@ class SERWBCore(Module):
packetizer = Packetizer() packetizer = Packetizer()
self.submodules += depacketizer, packetizer self.submodules += depacketizer, packetizer
# clock domain crossing # fifos
tx_cdc = stream.AsyncFIFO([("data", 32)], 16) tx_fifo = stream.SyncFIFO([("data", 32)], 16)
tx_cdc = ClockDomainsRenamer({"write": "sys", "read": phy.cd})(tx_cdc) rx_fifo = stream.SyncFIFO([("data", 32)], 16)
rx_cdc = stream.AsyncFIFO([("data", 32)], 16) self.submodules += tx_fifo, rx_fifo
rx_cdc = ClockDomainsRenamer({"write": phy.cd, "read": "sys"})(rx_cdc)
self.submodules += tx_cdc, rx_cdc
# scrambling # scrambling
scrambler = ClockDomainsRenamer(phy.cd)(Scrambler(enable=with_scrambling)) scrambler = Scrambler(enable=with_scrambling)
descrambler = ClockDomainsRenamer(phy.cd)(Descrambler(enable=with_scrambling)) descrambler = Descrambler(enable=with_scrambling)
self.submodules += scrambler, descrambler self.submodules += scrambler, descrambler
# modules connection # modules connection
self.comb += [ self.comb += [
# core --> phy # core --> phy
packetizer.source.connect(tx_cdc.sink), packetizer.source.connect(tx_fifo.sink),
tx_cdc.source.connect(scrambler.sink), tx_fifo.source.connect(scrambler.sink),
If(phy.init.ready, If(phy.init.ready,
If(scrambler.source.stb, If(scrambler.source.valid,
phy.serdes.tx_k.eq(scrambler.source.k), phy.serdes.tx_k.eq(scrambler.source.k),
phy.serdes.tx_d.eq(scrambler.source.d) phy.serdes.tx_d.eq(scrambler.source.d)
), ),
scrambler.source.ack.eq(1) scrambler.source.ready.eq(phy.serdes.tx_ce)
), ),
# phy --> core # phy --> core
descrambler.sink.stb.eq(phy.init.ready), If(phy.init.ready,
descrambler.sink.valid.eq(phy.serdes.rx_ce),
descrambler.sink.k.eq(phy.serdes.rx_k), descrambler.sink.k.eq(phy.serdes.rx_k),
descrambler.sink.d.eq(phy.serdes.rx_d), descrambler.sink.d.eq(phy.serdes.rx_d)
descrambler.source.connect(rx_cdc.sink), ),
rx_cdc.source.connect(depacketizer.sink), descrambler.source.connect(rx_fifo.sink),
rx_fifo.source.connect(depacketizer.sink),
# etherbone <--> core # etherbone <--> core
depacketizer.source.connect(etherbone.sink), depacketizer.source.connect(etherbone.sink),

160
artiq/gateware/serwb/kusphy.py
View File

@ -1,18 +1,26 @@
from migen import * from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from migen.genlib.cdc import MultiReg, PulseSynchronizer, Gearbox
from migen.genlib.misc import BitSlip from migen.genlib.misc import BitSlip
from migen.genlib.misc import WaitTimer
from misoc.interconnect import stream
from misoc.cores.code_8b10b import Encoder, Decoder from misoc.cores.code_8b10b import Encoder, Decoder
def K(x, y):
return (y << 5) | x
@ResetInserter()
class KUSSerdes(Module): class KUSSerdes(Module):
def __init__(self, pads, mode="master"): def __init__(self, pads, mode="master"):
if mode == "slave": if mode == "slave":
self.refclk = Signal() self.refclk = Signal()
self.tx_ce = Signal()
self.tx_k = Signal(4) self.tx_k = Signal(4)
self.tx_d = Signal(32) self.tx_d = Signal(32)
self.rx_ce = Signal()
self.rx_k = Signal(4) self.rx_k = Signal(4)
self.rx_d = Signal(32) self.rx_d = Signal(32)
@ -24,16 +32,14 @@ class KUSSerdes(Module):
self.rx_bitslip_value = Signal(6) self.rx_bitslip_value = Signal(6)
self.rx_delay_rst = Signal() self.rx_delay_rst = Signal()
self.rx_delay_inc = Signal() self.rx_delay_inc = Signal()
self.rx_delay_ce = Signal()
self.rx_delay_en_vtc = Signal() self.rx_delay_en_vtc = Signal()
# # # # # #
self.submodules.encoder = ClockDomainsRenamer("sys0p2x")( self.submodules.encoder = encoder = CEInserter()(Encoder(4, True))
Encoder(4, True)) self.comb += encoder.ce.eq(self.tx_ce)
self.decoders = [ClockDomainsRenamer("sys0p2x")( self.submodules.decoders = decoders = [CEInserter()(Decoder(True)) for _ in range(4)]
Decoder(True)) for _ in range(4)] self.comb += [decoders[i].ce.eq(self.rx_ce) for i in range(4)]
self.submodules += self.decoders
# clocking: # clocking:
@ -42,53 +48,26 @@ class KUSSerdes(Module):
# In Slave mode: # In Slave mode:
# - linerate/10 refclk provided by clk_pads # - linerate/10 refclk provided by clk_pads
# control/status cdc
tx_idle = Signal()
tx_comma = Signal()
rx_idle = Signal()
rx_comma = Signal()
rx_bitslip_value = Signal(6)
rx_delay_rst = Signal()
rx_delay_inc = Signal()
rx_delay_en_vtc = Signal()
rx_delay_ce = Signal()
self.specials += [
MultiReg(self.tx_idle, tx_idle, "sys0p2x"),
MultiReg(self.tx_comma, tx_comma, "sys0p2x"),
MultiReg(rx_idle, self.rx_idle, "sys"),
MultiReg(rx_comma, self.rx_comma, "sys"),
MultiReg(self.rx_bitslip_value, rx_bitslip_value, "sys0p2x"),
MultiReg(self.rx_delay_inc, rx_delay_inc, "sys"),
MultiReg(self.rx_delay_en_vtc, rx_delay_en_vtc, "sys")
]
self.submodules.do_rx_delay_rst = PulseSynchronizer("sys", "sys")
self.comb += [
rx_delay_rst.eq(self.do_rx_delay_rst.o),
self.do_rx_delay_rst.i.eq(self.rx_delay_rst)
]
self.submodules.do_rx_delay_ce = PulseSynchronizer("sys", "sys")
self.comb += [
rx_delay_ce.eq(self.do_rx_delay_ce.o),
self.do_rx_delay_ce.i.eq(self.rx_delay_ce)
]
# tx clock (linerate/10) # tx clock (linerate/10)
if mode == "master": if mode == "master":
self.submodules.tx_clk_gearbox = Gearbox(40, "sys0p2x", 8, "sys") clk_converter = stream.Converter(40, 8)
self.comb += self.tx_clk_gearbox.i.eq((0b1111100000 << 30) | self.submodules += clk_converter
(0b1111100000 << 20) | self.comb += [
(0b1111100000 << 10) | clk_converter.sink.valid.eq(1),
(0b1111100000 << 0)) clk_converter.sink.data.eq(Replicate(Signal(10, reset=0b1111100000), 4)),
clk_converter.source.ready.eq(1)
]
clk_o = Signal() clk_o = Signal()
self.specials += [ self.specials += [
Instance("OSERDESE3", Instance("OSERDESE3",
p_DATA_WIDTH=8, p_INIT=0, p_DATA_WIDTH=8, p_INIT=0,
p_IS_CLK_INVERTED=0, p_IS_CLKDIV_INVERTED=0, p_IS_RST_INVERTED=0, p_IS_CLK_INVERTED=0, p_IS_CLKDIV_INVERTED=0,
p_IS_RST_INVERTED=0,
o_OQ=clk_o, o_OQ=clk_o,
i_RST=ResetSignal("sys"), i_RST=ResetSignal("sys"),
i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"), i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"),
i_D=self.tx_clk_gearbox.o i_D=clk_converter.source.data
), ),
Instance("OBUFDS", Instance("OBUFDS",
i_I=clk_o, i_I=clk_o,
@ -98,29 +77,32 @@ class KUSSerdes(Module):
] ]
# tx datapath # tx datapath
# tx_data -> encoders -> gearbox -> serdes # tx_data -> encoders -> converter -> serdes
self.submodules.tx_gearbox = Gearbox(40, "sys0p2x", 8, "sys") self.submodules.tx_converter = tx_converter = stream.Converter(40, 8)
self.comb += [ self.comb += [
If(tx_comma, tx_converter.sink.valid.eq(1),
self.encoder.k[0].eq(1), self.tx_ce.eq(tx_converter.sink.ready),
self.encoder.d[0].eq(0xbc) tx_converter.source.ready.eq(1),
If(self.tx_idle,
tx_converter.sink.data.eq(0)
).Else( ).Else(
self.encoder.k[0].eq(self.tx_k[0]), tx_converter.sink.data.eq(
self.encoder.k[1].eq(self.tx_k[1]), Cat(*[encoder.output[i] for i in range(4)]))
self.encoder.k[2].eq(self.tx_k[2]), ),
self.encoder.k[3].eq(self.tx_k[3]), If(self.tx_comma,
self.encoder.d[0].eq(self.tx_d[0:8]), encoder.k[0].eq(1),
self.encoder.d[1].eq(self.tx_d[8:16]), encoder.d[0].eq(K(28,5)),
self.encoder.d[2].eq(self.tx_d[16:24]), ).Else(
self.encoder.d[3].eq(self.tx_d[24:32]) encoder.k[0].eq(self.tx_k[0]),
encoder.k[1].eq(self.tx_k[1]),
encoder.k[2].eq(self.tx_k[2]),
encoder.k[3].eq(self.tx_k[3]),
encoder.d[0].eq(self.tx_d[0:8]),
encoder.d[1].eq(self.tx_d[8:16]),
encoder.d[2].eq(self.tx_d[16:24]),
encoder.d[3].eq(self.tx_d[24:32])
) )
] ]
self.sync.sys0p2x += \
If(tx_idle,
self.tx_gearbox.i.eq(0)
).Else(
self.tx_gearbox.i.eq(Cat(*[self.encoder.output[i] for i in range(4)]))
)
serdes_o = Signal() serdes_o = Signal()
self.specials += [ self.specials += [
@ -131,7 +113,7 @@ class KUSSerdes(Module):
o_OQ=serdes_o, o_OQ=serdes_o,
i_RST=ResetSignal("sys"), i_RST=ResetSignal("sys"),
i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"), i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"),
i_D=self.tx_gearbox.o i_D=tx_converter.source.data
), ),
Instance("OBUFDS", Instance("OBUFDS",
i_I=serdes_o, i_I=serdes_o,
@ -163,9 +145,14 @@ class KUSSerdes(Module):
self.comb += self.refclk.eq(clk_i_bufg) self.comb += self.refclk.eq(clk_i_bufg)
# rx datapath # rx datapath
# serdes -> gearbox -> bitslip -> decoders -> rx_data # serdes -> converter -> bitslip -> decoders -> rx_data
self.submodules.rx_gearbox = Gearbox(8, "sys", 40, "sys0p2x") self.submodules.rx_converter = rx_converter = stream.Converter(8, 40)
self.submodules.rx_bitslip = ClockDomainsRenamer("sys0p2x")(BitSlip(40)) self.comb += [
self.rx_ce.eq(rx_converter.source.valid),
rx_converter.source.ready.eq(1)
]
self.submodules.rx_bitslip = rx_bitslip = CEInserter()(BitSlip(40))
self.comb += rx_bitslip.ce.eq(self.rx_ce)
serdes_i_nodelay = Signal() serdes_i_nodelay = Signal()
self.specials += [ self.specials += [
@ -186,9 +173,9 @@ class KUSSerdes(Module):
p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0, p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal("sys"), i_CLK=ClockSignal("sys"),
i_RST=rx_delay_rst, i_LOAD=0, i_RST=self.rx_delay_rst, i_LOAD=0,
i_INC=rx_delay_inc, i_EN_VTC=rx_delay_en_vtc, i_INC=1, i_EN_VTC=self.rx_delay_en_vtc,
i_CE=rx_delay_ce, i_CE=self.rx_delay_inc,
i_IDATAIN=serdes_i_nodelay, o_DATAOUT=serdes_i_delayed i_IDATAIN=serdes_i_nodelay, o_DATAOUT=serdes_i_delayed
), ),
@ -208,19 +195,20 @@ class KUSSerdes(Module):
] ]
self.comb += [ self.comb += [
self.rx_gearbox.i.eq(serdes_q), rx_converter.sink.valid.eq(1),
self.rx_bitslip.value.eq(rx_bitslip_value), rx_converter.sink.data.eq(serdes_q),
self.rx_bitslip.i.eq(self.rx_gearbox.o), rx_bitslip.value.eq(self.rx_bitslip_value),
self.decoders[0].input.eq(self.rx_bitslip.o[0:10]), rx_bitslip.i.eq(rx_converter.source.data),
self.decoders[1].input.eq(self.rx_bitslip.o[10:20]), decoders[0].input.eq(rx_bitslip.o[0:10]),
self.decoders[2].input.eq(self.rx_bitslip.o[20:30]), decoders[1].input.eq(rx_bitslip.o[10:20]),
self.decoders[3].input.eq(self.rx_bitslip.o[30:40]), decoders[2].input.eq(rx_bitslip.o[20:30]),
self.rx_k.eq(Cat(*[self.decoders[i].k for i in range(4)])), decoders[3].input.eq(rx_bitslip.o[30:40]),
self.rx_d.eq(Cat(*[self.decoders[i].d for i in range(4)])), self.rx_k.eq(Cat(*[decoders[i].k for i in range(4)])),
rx_idle.eq(self.rx_bitslip.o == 0), self.rx_d.eq(Cat(*[decoders[i].d for i in range(4)])),
rx_comma.eq(((self.decoders[0].d == 0xbc) & (self.decoders[0].k == 1)) & self.rx_comma.eq((decoders[0].k == 1) & (decoders[0].d == K(28,5)))
((self.decoders[1].d == 0x00) & (self.decoders[1].k == 0)) &
((self.decoders[2].d == 0x00) & (self.decoders[2].k == 0)) &
((self.decoders[3].d == 0x00) & (self.decoders[3].k == 0)))
] ]
idle_timer = WaitTimer(32)
self.submodules += idle_timer
self.comb += idle_timer.wait.eq(1)
self.sync += self.rx_idle.eq(idle_timer.done & (rx_bitslip.o == 0))

66
artiq/gateware/serwb/phy.py
View File

@ -14,11 +14,12 @@ from artiq.gateware.serwb.s7phy import S7Serdes
# 3) Slave sends K28.5 commas to allow Master to calibrate, Master sends K28.5 commas. # 3) Slave sends K28.5 commas to allow Master to calibrate, Master sends K28.5 commas.
# 4) Master stops sending K28.5 commas. # 4) Master stops sending K28.5 commas.
# 5) Slave stops sending K28.5 commas. # 5) Slave stops sending K28.5 commas.
# 6) Link is ready. # 6) Physical link is ready.
@ResetInserter()
class _SerdesMasterInit(Module): class _SerdesMasterInit(Module):
def __init__(self, serdes, taps, timeout=4096): def __init__(self, serdes, taps, timeout=2**14):
self.reset = Signal()
self.ready = Signal() self.ready = Signal()
self.error = Signal() self.error = Signal()
@ -31,14 +32,9 @@ class _SerdesMasterInit(Module):
self.delay_max_found = delay_max_found = Signal() self.delay_max_found = delay_max_found = Signal()
self.bitslip = bitslip = Signal(max=40) self.bitslip = bitslip = Signal(max=40)
timer = WaitTimer(timeout) self.submodules.timer = timer = WaitTimer(timeout)
self.submodules += timer
self.submodules.fsm = fsm = ResetInserter()(FSM(reset_state="IDLE"))
self.comb += self.fsm.reset.eq(self.reset)
self.comb += serdes.rx_delay_inc.eq(1)
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE", fsm.act("IDLE",
NextValue(delay, 0), NextValue(delay, 0),
NextValue(delay_min, 0), NextValue(delay_min, 0),
@ -109,14 +105,12 @@ class _SerdesMasterInit(Module):
serdes.rx_delay_rst.eq(1) serdes.rx_delay_rst.eq(1)
).Else( ).Else(
NextValue(delay, delay + 1), NextValue(delay, delay + 1),
serdes.rx_delay_ce.eq(1) serdes.rx_delay_inc.eq(1)
), ),
serdes.tx_comma.eq(1) serdes.tx_comma.eq(1)
) )
fsm.act("CHECK_SAMPLING_WINDOW", fsm.act("CHECK_SAMPLING_WINDOW",
If((delay_min == 0) | If((delay_max - delay_min) < taps//16,
(delay_max == (taps - 1)) |
((delay_max - delay_min) < taps//16),
NextValue(delay_min_found, 0), NextValue(delay_min_found, 0),
NextValue(delay_max_found, 0), NextValue(delay_max_found, 0),
NextState("WAIT_STABLE") NextState("WAIT_STABLE")
@ -131,7 +125,6 @@ class _SerdesMasterInit(Module):
).Else( ).Else(
NextValue(delay, delay + 1), NextValue(delay, delay + 1),
serdes.rx_delay_inc.eq(1), serdes.rx_delay_inc.eq(1),
serdes.rx_delay_ce.eq(1),
NextState("WAIT_SAMPLING_WINDOW") NextState("WAIT_SAMPLING_WINDOW")
), ),
serdes.tx_comma.eq(1) serdes.tx_comma.eq(1)
@ -147,13 +140,16 @@ class _SerdesMasterInit(Module):
fsm.act("READY", fsm.act("READY",
self.ready.eq(1) self.ready.eq(1)
) )
if hasattr(serdes, "rx_delay_en_vtc"):
self.comb += serdes.rx_delay_en_vtc.eq(self.ready)
fsm.act("ERROR", fsm.act("ERROR",
self.error.eq(1) self.error.eq(1)
) )
@ResetInserter()
class _SerdesSlaveInit(Module, AutoCSR): class _SerdesSlaveInit(Module, AutoCSR):
def __init__(self, serdes, taps, timeout=4096): def __init__(self, serdes, taps, timeout=2**14):
self.ready = Signal() self.ready = Signal()
self.error = Signal() self.error = Signal()
@ -166,13 +162,10 @@ class _SerdesSlaveInit(Module, AutoCSR):
self.delay_max_found = delay_max_found = Signal() self.delay_max_found = delay_max_found = Signal()
self.bitslip = bitslip = Signal(max=40) self.bitslip = bitslip = Signal(max=40)
timer = WaitTimer(timeout) self.submodules.timer = timer = WaitTimer(timeout)
self.submodules += timer
self.comb += serdes.rx_delay_inc.eq(1) self.submodules.fsm = fsm = FSM(reset_state="IDLE")
# reset
self.submodules.fsm = fsm = ResetInserter()(FSM(reset_state="IDLE"))
self.comb += fsm.reset.eq(serdes.rx_idle)
fsm.act("IDLE", fsm.act("IDLE",
NextValue(delay, 0), NextValue(delay, 0),
NextValue(delay_min, 0), NextValue(delay_min, 0),
@ -181,7 +174,11 @@ class _SerdesSlaveInit(Module, AutoCSR):
NextValue(delay_max_found, 0), NextValue(delay_max_found, 0),
serdes.rx_delay_rst.eq(1), serdes.rx_delay_rst.eq(1),
NextValue(bitslip, 0), NextValue(bitslip, 0),
timer.wait.eq(1),
If(timer.done,
timer.wait.eq(0),
NextState("WAIT_STABLE"), NextState("WAIT_STABLE"),
),
serdes.tx_idle.eq(1) serdes.tx_idle.eq(1)
) )
fsm.act("WAIT_STABLE", fsm.act("WAIT_STABLE",
@ -229,14 +226,12 @@ class _SerdesSlaveInit(Module, AutoCSR):
serdes.rx_delay_rst.eq(1) serdes.rx_delay_rst.eq(1)
).Else( ).Else(
NextValue(delay, delay + 1), NextValue(delay, delay + 1),
serdes.rx_delay_ce.eq(1) serdes.rx_delay_inc.eq(1)
), ),
serdes.tx_idle.eq(1) serdes.tx_idle.eq(1)
) )
fsm.act("CHECK_SAMPLING_WINDOW", fsm.act("CHECK_SAMPLING_WINDOW",
If((delay_min == 0) | If((delay_max - delay_min) < taps//16,
(delay_max == (taps - 1)) |
((delay_max - delay_min) < taps//16),
NextValue(delay_min_found, 0), NextValue(delay_min_found, 0),
NextValue(delay_max_found, 0), NextValue(delay_max_found, 0),
NextState("WAIT_STABLE") NextState("WAIT_STABLE")
@ -251,7 +246,6 @@ class _SerdesSlaveInit(Module, AutoCSR):
).Else( ).Else(
NextValue(delay, delay + 1), NextValue(delay, delay + 1),
serdes.rx_delay_inc.eq(1), serdes.rx_delay_inc.eq(1),
serdes.rx_delay_ce.eq(1),
NextState("WAIT_SAMPLING_WINDOW") NextState("WAIT_SAMPLING_WINDOW")
) )
) )
@ -274,13 +268,15 @@ class _SerdesSlaveInit(Module, AutoCSR):
fsm.act("READY", fsm.act("READY",
self.ready.eq(1) self.ready.eq(1)
) )
if hasattr(serdes, "rx_delay_en_vtc"):
self.comb += serdes.rx_delay_en_vtc.eq(self.ready)
fsm.act("ERROR", fsm.act("ERROR",
self.error.eq(1) self.error.eq(1)
) )
class _SerdesControl(Module, AutoCSR): class _SerdesControl(Module, AutoCSR):
def __init__(self, init, mode="master"): def __init__(self, serdes, init, mode="master"):
if mode == "master": if mode == "master":
self.reset = CSR() self.reset = CSR()
self.ready = CSRStatus() self.ready = CSRStatus()
@ -296,7 +292,18 @@ class _SerdesControl(Module, AutoCSR):
# # # # # #
if mode == "master": if mode == "master":
# In Master mode, reset is coming from CSR,
# it resets the Master that will also reset
# the Slave by putting the link in idle.
self.comb += init.reset.eq(self.reset.re) self.comb += init.reset.eq(self.reset.re)
else:
# In Slave mode, reset is coming from link,
# Master reset the Slave by putting the link
# in idle.
self.comb += [
init.reset.eq(serdes.rx_idle),
serdes.reset.eq(serdes.rx_idle)
]
self.comb += [ self.comb += [
self.ready.status.eq(init.ready), self.ready.status.eq(init.ready),
self.error.status.eq(init.error), self.error.status.eq(init.error),
@ -310,7 +317,6 @@ class _SerdesControl(Module, AutoCSR):
class SERWBPHY(Module, AutoCSR): class SERWBPHY(Module, AutoCSR):
cd = "sys0p2x"
def __init__(self, device, pads, mode="master"): def __init__(self, device, pads, mode="master"):
assert mode in ["master", "slave"] assert mode in ["master", "slave"]
if device[:4] == "xcku": if device[:4] == "xcku":
@ -325,4 +331,4 @@ class SERWBPHY(Module, AutoCSR):
self.submodules.init = _SerdesMasterInit(self.serdes, taps) self.submodules.init = _SerdesMasterInit(self.serdes, taps)
else: else:
self.submodules.init = _SerdesSlaveInit(self.serdes, taps) self.submodules.init = _SerdesSlaveInit(self.serdes, taps)
self.submodules.control = _SerdesControl(self.init, mode) self.submodules.control = _SerdesControl(self.serdes, self.init, mode)

157
artiq/gateware/serwb/s7phy.py
View File

@ -1,18 +1,26 @@
from migen import * from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from migen.genlib.cdc import MultiReg, Gearbox
from migen.genlib.misc import BitSlip from migen.genlib.misc import BitSlip
from migen.genlib.misc import WaitTimer
from misoc.interconnect import stream
from misoc.cores.code_8b10b import Encoder, Decoder from misoc.cores.code_8b10b import Encoder, Decoder
def K(x, y):
return (y << 5) | x
@ResetInserter()
class S7Serdes(Module): class S7Serdes(Module):
def __init__(self, pads, mode="master"): def __init__(self, pads, mode="master"):
if mode == "slave": if mode == "slave":
self.refclk = Signal() self.refclk = Signal()
self.tx_ce = Signal()
self.tx_k = Signal(4) self.tx_k = Signal(4)
self.tx_d = Signal(32) self.tx_d = Signal(32)
self.rx_ce = Signal()
self.rx_k = Signal(4) self.rx_k = Signal(4)
self.rx_d = Signal(32) self.rx_d = Signal(32)
@ -24,44 +32,30 @@ class S7Serdes(Module):
self.rx_bitslip_value = Signal(6) self.rx_bitslip_value = Signal(6)
self.rx_delay_rst = Signal() self.rx_delay_rst = Signal()
self.rx_delay_inc = Signal() self.rx_delay_inc = Signal()
self.rx_delay_ce = Signal()
# # # # # #
self.submodules.encoder = ClockDomainsRenamer("sys0p2x")( self.submodules.encoder = encoder = CEInserter()(Encoder(4, True))
Encoder(4, True)) self.comb += encoder.ce.eq(self.tx_ce)
self.decoders = [ClockDomainsRenamer("sys0p2x")( self.submodules.decoders = decoders = [CEInserter()(Decoder(True)) for _ in range(4)]
Decoder(True)) for _ in range(4)] self.comb += [decoders[i].ce.eq(self.rx_ce) for i in range(4)]
self.submodules += self.decoders
# clocking: # clocking:
# In master mode: # In Master mode:
# - linerate/10 slave refclk generated on clk_pads # - linerate/10 refclk is generated on clk_pads
# In Slave mode: # In Slave mode:
# - linerate/10 refclk provided by clk_pads # - linerate/10 refclk is provided by clk_pads
# control/status cdc
tx_idle = Signal()
tx_comma = Signal()
rx_idle = Signal()
rx_comma = Signal()
rx_bitslip_value = Signal(6)
self.specials += [
MultiReg(self.tx_idle, tx_idle, "sys0p2x"),
MultiReg(self.tx_comma, tx_comma, "sys0p2x"),
MultiReg(rx_idle, self.rx_idle, "sys"),
MultiReg(rx_comma, self.rx_comma, "sys")
]
self.specials += MultiReg(self.rx_bitslip_value, rx_bitslip_value, "sys0p2x"),
# tx clock (linerate/10) # tx clock (linerate/10)
if mode == "master": if mode == "master":
self.submodules.tx_clk_gearbox = Gearbox(40, "sys0p2x", 8, "sys") clk_converter = stream.Converter(40, 8)
self.comb += self.tx_clk_gearbox.i.eq((0b1111100000 << 30) | self.submodules += clk_converter
(0b1111100000 << 20) | self.comb += [
(0b1111100000 << 10) | clk_converter.sink.valid.eq(1),
(0b1111100000 << 0)) clk_converter.sink.data.eq(Replicate(Signal(10, reset=0b1111100000), 4)),
clk_converter.source.ready.eq(1)
]
clk_o = Signal() clk_o = Signal()
self.specials += [ self.specials += [
Instance("OSERDESE2", Instance("OSERDESE2",
@ -73,10 +67,10 @@ class S7Serdes(Module):
i_OCE=1, i_OCE=1,
i_RST=ResetSignal("sys"), i_RST=ResetSignal("sys"),
i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"), i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"),
i_D1=self.tx_clk_gearbox.o[0], i_D2=self.tx_clk_gearbox.o[1], i_D1=clk_converter.source.data[0], i_D2=clk_converter.source.data[1],
i_D3=self.tx_clk_gearbox.o[2], i_D4=self.tx_clk_gearbox.o[3], i_D3=clk_converter.source.data[2], i_D4=clk_converter.source.data[3],
i_D5=self.tx_clk_gearbox.o[4], i_D6=self.tx_clk_gearbox.o[5], i_D5=clk_converter.source.data[4], i_D6=clk_converter.source.data[5],
i_D7=self.tx_clk_gearbox.o[6], i_D8=self.tx_clk_gearbox.o[7] i_D7=clk_converter.source.data[6], i_D8=clk_converter.source.data[7]
), ),
Instance("OBUFDS", Instance("OBUFDS",
i_I=clk_o, i_I=clk_o,
@ -86,29 +80,32 @@ class S7Serdes(Module):
] ]
# tx datapath # tx datapath
# tx_data -> encoders -> gearbox -> serdes # tx_data -> encoders -> converter -> serdes
self.submodules.tx_gearbox = Gearbox(40, "sys0p2x", 8, "sys") self.submodules.tx_converter = tx_converter = stream.Converter(40, 8)
self.comb += [ self.comb += [
If(tx_comma, tx_converter.sink.valid.eq(1),
self.encoder.k[0].eq(1), self.tx_ce.eq(tx_converter.sink.ready),
self.encoder.d[0].eq(0xbc) tx_converter.source.ready.eq(1),
If(self.tx_idle,
tx_converter.sink.data.eq(0)
).Else( ).Else(
self.encoder.k[0].eq(self.tx_k[0]), tx_converter.sink.data.eq(
self.encoder.k[1].eq(self.tx_k[1]), Cat(*[encoder.output[i] for i in range(4)]))
self.encoder.k[2].eq(self.tx_k[2]), ),
self.encoder.k[3].eq(self.tx_k[3]), If(self.tx_comma,
self.encoder.d[0].eq(self.tx_d[0:8]), encoder.k[0].eq(1),
self.encoder.d[1].eq(self.tx_d[8:16]), encoder.d[0].eq(K(28,5)),
self.encoder.d[2].eq(self.tx_d[16:24]), ).Else(
self.encoder.d[3].eq(self.tx_d[24:32]) encoder.k[0].eq(self.tx_k[0]),
encoder.k[1].eq(self.tx_k[1]),
encoder.k[2].eq(self.tx_k[2]),
encoder.k[3].eq(self.tx_k[3]),
encoder.d[0].eq(self.tx_d[0:8]),
encoder.d[1].eq(self.tx_d[8:16]),
encoder.d[2].eq(self.tx_d[16:24]),
encoder.d[3].eq(self.tx_d[24:32])
) )
] ]
self.sync.sys0p2x += \
If(tx_idle,
self.tx_gearbox.i.eq(0)
).Else(
self.tx_gearbox.i.eq(Cat(*[self.encoder.output[i] for i in range(4)]))
)
serdes_o = Signal() serdes_o = Signal()
self.specials += [ self.specials += [
@ -121,10 +118,10 @@ class S7Serdes(Module):
i_OCE=1, i_OCE=1,
i_RST=ResetSignal("sys"), i_RST=ResetSignal("sys"),
i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"), i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal("sys"),
i_D1=self.tx_gearbox.o[0], i_D2=self.tx_gearbox.o[1], i_D1=tx_converter.source.data[0], i_D2=tx_converter.source.data[1],
i_D3=self.tx_gearbox.o[2], i_D4=self.tx_gearbox.o[3], i_D3=tx_converter.source.data[2], i_D4=tx_converter.source.data[3],
i_D5=self.tx_gearbox.o[4], i_D6=self.tx_gearbox.o[5], i_D5=tx_converter.source.data[4], i_D6=tx_converter.source.data[5],
i_D7=self.tx_gearbox.o[6], i_D8=self.tx_gearbox.o[7] i_D7=tx_converter.source.data[6], i_D8=tx_converter.source.data[7]
), ),
Instance("OBUFDS", Instance("OBUFDS",
i_I=serdes_o, i_I=serdes_o,
@ -156,9 +153,14 @@ class S7Serdes(Module):
self.comb += self.refclk.eq(clk_i_bufg) self.comb += self.refclk.eq(clk_i_bufg)
# rx datapath # rx datapath
# serdes -> gearbox -> bitslip -> decoders -> rx_data # serdes -> converter -> bitslip -> decoders -> rx_data
self.submodules.rx_gearbox = Gearbox(8, "sys", 40, "sys0p2x") self.submodules.rx_converter = rx_converter = stream.Converter(8, 40)
self.submodules.rx_bitslip = ClockDomainsRenamer("sys0p2x")(BitSlip(40)) self.comb += [
self.rx_ce.eq(rx_converter.source.valid),
rx_converter.source.ready.eq(1)
]
self.submodules.rx_bitslip = rx_bitslip = CEInserter()(BitSlip(40))
self.comb += rx_bitslip.ce.eq(self.rx_ce)
serdes_i_nodelay = Signal() serdes_i_nodelay = Signal()
self.specials += [ self.specials += [
@ -180,8 +182,8 @@ class S7Serdes(Module):
i_C=ClockSignal(), i_C=ClockSignal(),
i_LD=self.rx_delay_rst, i_LD=self.rx_delay_rst,
i_CE=self.rx_delay_ce, i_CE=self.rx_delay_inc,
i_LDPIPEEN=0, i_INC=self.rx_delay_inc, i_LDPIPEEN=0, i_INC=1,
i_IDATAIN=serdes_i_nodelay, o_DATAOUT=serdes_i_delayed i_IDATAIN=serdes_i_nodelay, o_DATAOUT=serdes_i_delayed
), ),
@ -204,19 +206,20 @@ class S7Serdes(Module):
] ]
self.comb += [ self.comb += [
self.rx_gearbox.i.eq(serdes_q), rx_converter.sink.valid.eq(1),
self.rx_bitslip.value.eq(rx_bitslip_value), rx_converter.sink.data.eq(serdes_q),
self.rx_bitslip.i.eq(self.rx_gearbox.o), rx_bitslip.value.eq(self.rx_bitslip_value),
self.decoders[0].input.eq(self.rx_bitslip.o[0:10]), rx_bitslip.i.eq(rx_converter.source.data),
self.decoders[1].input.eq(self.rx_bitslip.o[10:20]), decoders[0].input.eq(rx_bitslip.o[0:10]),
self.decoders[2].input.eq(self.rx_bitslip.o[20:30]), decoders[1].input.eq(rx_bitslip.o[10:20]),
self.decoders[3].input.eq(self.rx_bitslip.o[30:40]), decoders[2].input.eq(rx_bitslip.o[20:30]),
self.rx_k.eq(Cat(*[self.decoders[i].k for i in range(4)])), decoders[3].input.eq(rx_bitslip.o[30:40]),
self.rx_d.eq(Cat(*[self.decoders[i].d for i in range(4)])), self.rx_k.eq(Cat(*[decoders[i].k for i in range(4)])),
rx_idle.eq(self.rx_bitslip.o == 0), self.rx_d.eq(Cat(*[decoders[i].d for i in range(4)])),
rx_comma.eq(((self.decoders[0].d == 0xbc) & (self.decoders[0].k == 1)) & self.rx_comma.eq((decoders[0].k == 1) & (decoders[0].d == K(28,5)))
((self.decoders[1].d == 0x00) & (self.decoders[1].k == 0)) &
((self.decoders[2].d == 0x00) & (self.decoders[2].k == 0)) &
((self.decoders[3].d == 0x00) & (self.decoders[3].k == 0)))
] ]
idle_timer = WaitTimer(32)
self.submodules += idle_timer
self.comb += idle_timer.wait.eq(1)
self.sync += self.rx_idle.eq(idle_timer.done & (rx_bitslip.o == 0))

2
artiq/gateware/targets/sayma_amc.py
View File

@ -174,7 +174,7 @@ class Standalone(MiniSoC, AMPSoC):
self.submodules.serwb_phy_amc = serwb_phy_amc self.submodules.serwb_phy_amc = serwb_phy_amc
self.csr_devices.append("serwb_phy_amc") self.csr_devices.append("serwb_phy_amc")
serwb_core = serwb.core.SERWBCore(serwb_phy_amc, int(self.clk_freq), mode="slave", with_scrambling=True) serwb_core = serwb.core.SERWBCore(serwb_phy_amc, int(self.clk_freq), mode="slave", with_scrambling=False)
self.submodules += serwb_core self.submodules += serwb_core
self.add_wb_slave(self.mem_map["serwb"], 8192, serwb_core.etherbone.wishbone.bus) self.add_wb_slave(self.mem_map["serwb"], 8192, serwb_core.etherbone.wishbone.bus)

2
artiq/gateware/targets/sayma_rtm.py
View File

@ -168,7 +168,7 @@ class SaymaRTM(Module):
self.comb += self.crg.serwb_refclk.eq(serwb_phy_rtm.serdes.refclk) self.comb += self.crg.serwb_refclk.eq(serwb_phy_rtm.serdes.refclk)
csr_devices.append("serwb_phy_rtm") csr_devices.append("serwb_phy_rtm")
serwb_core = serwb.core.SERWBCore(serwb_phy_rtm, int(clk_freq), mode="master", with_scrambling=True) serwb_core = serwb.core.SERWBCore(serwb_phy_rtm, int(clk_freq), mode="master", with_scrambling=False)
self.submodules += serwb_core self.submodules += serwb_core
# process CSR devices and connect them to serwb # process CSR devices and connect them to serwb