def __init__(self, data_clk_i, frame_signals_i, data_signals_i):
# Outputs
# ==========================================
self.data_clk_o = Signal(name="data_clk_o")
self.data_o = []
self.data_stb_o = []
# Design
# ==========================================
data_clk_to_bufr = Signal()
self.clock_domains.cd_dclk = cd_dclk = ClockDomain() # !!!! Inverted!
self.specials += DifferentialInput(data_clk_i.p, data_clk_i.n, data_clk_to_bufr)
self.specials += Instance("BUFG", i_I=~data_clk_to_bufr, o_O=cd_dclk.clk) # !!!! Inverted!
# platform.add_period_constraint(cd_dclk.clk, 4.)
self.specials += [AsyncResetSynchronizer(cd_dclk, ResetSignal("sys"))]
self.phy_channels = []
for channel, (frame, data) in enumerate(zip(frame_signals_i, data_signals_i)):
frame_se = Signal()
data_se = Signal()
self.specials += DifferentialInput(frame.p, frame.n, frame_se)
self.specials += DifferentialInput(data.p, data.n, data_se)
channel_phy = ClockDomainsRenamer("dclk")(TdcGpx2ChannelPhy(frame_i=frame_se, data_i=data_se))
self.phy_channels.append(channel_phy)
setattr(self.submodules, "channel{}".format(channel), channel_phy)
self.data_o.append(channel_phy.data_o)
self.data_stb_o.append(channel_phy.stb_o)
def __init__(self, platform, eem):
self.sck_en = Signal()
self.cnv = Signal()
self.clkout = Signal()
spip = platform.request("{}_adc_spi_p".format(eem))
spin = platform.request("{}_adc_spi_n".format(eem))
cnv = platform.request("{}_cnv".format(eem))
sdr = platform.request("{}_sdr".format(eem))
dp = platform.request("{}_adc_data_p".format(eem))
dn = platform.request("{}_adc_data_n".format(eem))
clkout_se = Signal()
clkout_inv = Signal()
sck = Signal()
self.specials += [
DifferentialOutput(self.cnv, cnv.p, cnv.n),
DifferentialOutput(1, sdr.p, sdr.n),
DDROutput(self.sck_en, 0, sck, ClockSignal("sys")),
DifferentialOutput(sck, spip.clk, spin.clk),
DifferentialInput(dp.clkout, dn.clkout, clkout_se),
# FIXME (hardware): CLKOUT is inverted
# (Sampler v2.0, v2.1) out on rising, in on falling
Instance("BUFR", i_I=clkout_se, o_O=clkout_inv)
]
self.comb += self.clkout.eq(~clkout_inv)
# define clock here before the input delays below
self.clkout_p = dp.clkout # available for false paths
platform.add_platform_command(
"create_clock -name {clk} -period 8 [get_nets {clk}]",
clk=dp.clkout)
# platform.add_period_constraint(sampler_pads.clkout_p, 8.)
for i in "abcd":
sdo = Signal()
setattr(self, "sdo{}".format(i), sdo)
if i != "a":
# FIXME (hardware): sdob, sdoc, sdod are inverted
# (Sampler v2.0, v2.1)
sdo, sdo_inv = Signal(), sdo
self.comb += sdo_inv.eq(~sdo)
sdop = getattr(dp, "sdo{}".format(i))
sdon = getattr(dn, "sdo{}".format(i))
self.specials += [
DifferentialInput(sdop, sdon, sdo),
]
# -0+1.5 hold (t_HSDO_SDR), -0.5+0.5 skew
platform.add_platform_command(
"set_input_delay -clock {clk} -max 2 [get_ports {port}]\n"
"set_input_delay -clock {clk} -min -0.5 [get_ports {port}]",
clk=dp.clkout,
port=sdop)
def __init__(self, pad, pad_n=None):
self.rtlink = rtlink.Interface(rtlink.OInterface(2, 2),
rtlink.IInterface(1))
self.overrides = []
self.probes = []
# # #
sensitivity = Signal(2)
sample = Signal()
self.sync.rio += [
sample.eq(0),
If(self.rtlink.o.stb & self.rtlink.o.address[1],
sensitivity.eq(self.rtlink.o.data),
If(self.rtlink.o.address[0], sample.eq(1)))
]
i = Signal()
i_d = Signal(reset_less=True)
pad_i = Signal()
if pad_n is None:
self.comb += pad_i.eq(pad)
else:
self.specials += DifferentialInput(pad, pad_n, pad_i)
self.specials += MultiReg(pad_i, i, "rio_phy")
self.sync.rio_phy += i_d.eq(i)
self.comb += [
self.rtlink.i.stb.eq(sample | (sensitivity[0] & (i & ~i_d))
| (sensitivity[1] & (~i & i_d))),
self.rtlink.i.data.eq(i)
]
self.probes += [i]
def __init__(self, pad, pad_n=None, name="external_trigger"):
super().__init__(name)
# Outputs
self.trigger_re = Signal() # CD: sys
self.trigger_fe = Signal() # CD: sys
# FIXME: Revise trigger registration
self.register_trigger(self.trigger_re, "re", "rio_phy")
self.register_trigger(self.trigger_fe, "fe", "rio_phy")
# # #
if pad_n is not None:
external_trigger = Signal()
self.specials += DifferentialInput(pad, pad_n, external_trigger)
else:
external_trigger = pad
trigger_ext_d = Signal()
trigger_ext_prev = Signal()
self.sync += [
trigger_ext_prev.eq(trigger_ext_d),
trigger_ext_d.eq(external_trigger)
]
self.comb += [
self.trigger_re.eq(~trigger_ext_prev & trigger_ext_d),
self.trigger_fe.eq(trigger_ext_prev & ~trigger_ext_d)
]
def register_jref(self, jref):
self.jref_registered = True
if isinstance(jref, Signal):
self.comb += self.jref.eq(jref)
elif isinstance(jref, Record):
self.specials += DifferentialInput(jref.p, jref.n, self.jref)
else:
raise ValueError
def register_jsync(self, jsync):
self.jsync_registered = True
if isinstance(jsync, Signal):
self.comb += self.jsync.eq(jsync)
elif isinstance(jsync, Record):
self.specials += DifferentialInput(jsync.p, jsync.n, self.jsync)
else:
raise ValueError
def __init__(self, platform, eem):
self.sck_en = Signal()
self.cnv = Signal()
self.clkout = Signal()
spip = platform.request("{}_adc_spi_p".format(eem))
spin = platform.request("{}_adc_spi_n".format(eem))
cnv = platform.request("{}_cnv".format(eem))
sdr = platform.request("{}_sdr".format(eem))
dp = platform.request("{}_adc_data_p".format(eem))
dn = platform.request("{}_adc_data_n".format(eem))
clkout_se = Signal()
sck = Signal()
self.specials += [
DifferentialOutput(self.cnv, cnv.p, cnv.n),
DifferentialOutput(1, sdr.p, sdr.n),
DDROutput(0, self.sck_en, sck, ClockSignal("rio_phy")),
DifferentialOutput(sck, spip.clk, spin.clk),
DifferentialInput(dp.clkout, dn.clkout, clkout_se),
Instance("BUFR", i_I=clkout_se, o_O=self.clkout)
]
# here to be early before the input delays below to have the clock
# available
self.clkout_p = dp.clkout # availabel for false paths
platform.add_platform_command(
"create_clock -name {clk} -period 8 [get_nets {clk}]",
clk=dp.clkout)
# platform.add_period_constraint(sampler_pads.clkout_p, 8.)
for i in "abcd":
sdo = Signal()
setattr(self, "sdo{}".format(i), sdo)
sdop = getattr(dp, "sdo{}".format(i))
sdon = getattr(dn, "sdo{}".format(i))
self.specials += [
DifferentialInput(sdop, sdon, sdo),
]
# 8, -0+1.5 hold (t_HSDO_DDR), -0.5+0.5 skew
platform.add_platform_command(
"set_input_delay -clock {clk} "
"-max 2 [get_ports {port}] -clock_fall\n"
"set_input_delay -clock {clk} "
"-min -0.5 [get_ports {port}] -clock_fall",
clk=dp.clkout, port=sdop)
def register_clkin(self, clkin, freq):
self.clkin = Signal()
if isinstance(clkin, (Signal, ClockSignal)):
self.comb += self.clkin.eq(clkin)
elif isinstance(clkin, Record):
self.specials += DifferentialInput(clkin.p, clkin.n, self.clkin)
else:
raise ValueError
self.clkin_freq = freq
def __init__(self, p, sys_clk_freq, f_sample_tx=None):
# ----------------------------
# Clock and Reset Generation
# ----------------------------
xtal_pads = p.request(p.default_clk_name)
xtal = Signal()
self.specials += DifferentialInput(xtal_pads.p, xtal_pads.n, xtal)
xtal_f = 1e9 / p.default_clk_period
rst = p.request("cpu_reset")
cds = [("cd_sys", sys_clk_freq)]
if f_sample_tx is not None:
cds.append(("cd_sample_tx", f_sample_tx))
for cd, f in cds:
setattr(self.clock_domains, cd, ClockDomain(cd))
pll = S6PLL(speedgrade=-3)
self.comb += pll.reset.eq(rst)
pll.register_clkin(xtal, xtal_f)
pll.create_clkout(getattr(self, cd), f)
self.submodules += pll
if f_sample_tx is not None:
# Provide a ENC clock signal on SMA_GPIO
enc_out = Signal()
self.specials += Instance(
"ODDR2",
o_Q=enc_out,
i_C0=ClockSignal("sample_tx"),
i_C1=~ClockSignal("sample_tx"),
i_CE=1,
i_D0=1,
i_D1=0
)
p.add_extension(
# Connect GPIO_SMA on SP605 with CLK input on 1525A
[("ENC_CLK", 0,
Subsignal("p", Pins("SMA_GPIO:P")),
Subsignal("n", Pins("SMA_GPIO:N")),
# Note: the LTC eval board needs to be modded
# to accept a differential clock
IOStandard("LVDS_25")
)]
)
gpio_pads = p.request("ENC_CLK")
self.specials += DifferentialOutput(enc_out, gpio_pads.p, gpio_pads.n)
def __init__(self, pins, pins_n):
self.data = [Signal(2) for _ in range(2 + len(pins.mosi))]
for d, pp, pn in zip(self.data,
[pins.clk] + list(pins.mosi),
[pins_n.clk] + list(pins_n.mosi)):
ddr = Signal()
self.specials += [
# d1 closer to q
DDROutput(d[1], d[0], ddr, ClockSignal("rio_phy")),
DifferentialOutput(ddr, pp, pn),
]
ddr = Signal()
self.specials += [
DifferentialInput(pins.miso, pins_n.miso, ddr),
# q1 closer to d
DDRInput(ddr, self.data[-1][0], self.data[-1][1],
ClockSignal("rio_phy")),
]
def __init__(self, platform):
self.jreset = CSRStorage(reset=1)
self.jref = Signal()
self.refclk = Signal()
refclk2 = Signal()
self.clock_domains.cd_jesd = ClockDomain()
refclk_pads = platform.request("dac_refclk", 0)
platform.add_period_constraint(refclk_pads.p, 1e9/self.refclk_freq)
self.specials += [
Instance("IBUFDS_GTE3", i_CEB=0, p_REFCLK_HROW_CK_SEL=0b00,
i_I=refclk_pads.p, i_IB=refclk_pads.n,
o_O=self.refclk, o_ODIV2=refclk2),
Instance("BUFG_GT", i_I=refclk2, o_O=self.cd_jesd.clk),
AsyncResetSynchronizer(self.cd_jesd, self.jreset.storage),
]
jref = platform.request("dac_sysref")
self.specials += DifferentialInput(jref.p, jref.n, self.jref)
def __init__(self, platform, eem):
self.sdi = Signal()
self.ldac = Signal()
self.busy = Signal(reset=1)
self.syncr = Signal(reset=1)
self.rst = Signal(reset=1)
self.clr = Signal(reset=1)
self.sclk = Signal()
spip = platform.request("{}_spi_p".format(eem))
spin = platform.request("{}_spi_n".format(eem))
ldacn = platform.request("{}_ldac_n".format(eem))
busy = platform.request("{}_busy".format(eem))
clrn = platform.request("{}_clr_n".format(eem))
self.specials += [
DifferentialOutput(self.ldac, ldacn.p, ldacn.n),
DifferentialOutput(self.sdi, spip.mosi, spin.mosi),
DifferentialOutput(self.sclk, spip.clk, spin.clk),
DifferentialOutput(self.syncr, spip.cs_n, spin.cs_n),
DifferentialOutput(self.clr, clrn.p, clrn.n),
DifferentialInput(busy.p, busy.n, self.busy),
]
def __init__(self, adclk_i, lclk_i, dat_i):
"""ADS5296A ADC phy for Xilinx Series 7
Args:
adclk_i (differential signal): frame clock
lclk_i (differential signal): bit clock
dat_i (array of differential signals): data lines
"""
# Module constants
# ==========================================
DAT_O_LEN = 10
BUFR_DIVIDE = 5
VALID_FRAME_OUT = 0b1111100000
# Outputs
# ==========================================
self.data_clk_o = Signal()
self.bitslip_done = Signal()
self.data_o = [Signal(DAT_O_LEN, name="data_{}_o".format(i)) for i in range(9)]
# RTLink Control Status Registers
# ==========================================
regs = [
*[("data{}_delay_value".format(x), 5) for x in range(9)],
("adclk_delay_value", 5),
("phy_reset", 1, 1),
("bitslip_done", 1, 0, "ro")
]
csr = RtLinkCSR(regs, "ads5296a_phy")
self.submodules.csr = csr
# Design
# ==========================================
input_lines = [*dat_i, adclk_i]
lines_delayed = [Signal(name="line_delayed_{}".format(i)) for i in range(9)]
# 0 - data[0]
# 1 - data[1]
# ...
# 7 - data[7]
# 8 - adclk
for idx, (input_line, line_delayed) in enumerate(zip(input_lines, lines_delayed)):
line_buffer = Signal()
self.specials += DifferentialInput(i_p=input_line.p,
i_n=input_line.n,
o=line_buffer)
self.submodules += XilinxIdelayE2(
data_i=line_buffer,
data_o=line_delayed,
delay_value_i=getattr(csr, regs[idx][0]),
delay_value_ld_i=getattr(csr, regs[idx][0]+"_ld")
)
# Clocking
lclk_ibuf = Signal()
lclk_bufg = Signal()
self.lclk = lclk_bufg
self.lclk_bufio = lclk_bufio = Signal()
self.clock_domains.cd_adclk_clkdiv = cd_adclk_clkdiv = ClockDomain()
self.specials += [AsyncResetSynchronizer(cd_adclk_clkdiv, csr.phy_reset)]
self.specials += DifferentialInput(i_p=lclk_i.p,
i_n=lclk_i.n,
o=lclk_ibuf)
self.specials += Instance("BUFIO",
i_I=lclk_ibuf,
o_O=lclk_bufio)
self.specials += Instance("BUFR",
p_BUFR_DIVIDE=str(BUFR_DIVIDE),
i_I=lclk_ibuf,
i_CE=1,
i_CLR=0,
o_O=lclk_bufg)
self.specials += Instance("BUFG",
i_I=lclk_bufg,
o_O=cd_adclk_clkdiv.clk)
# Bitslip logic
bitslip = Signal()
bitslip_cnt = Signal(4)
self.sync.adclk_clkdiv += [
bitslip.eq(0),
bitslip_cnt.eq(bitslip_cnt + 1),
self.bitslip_done.eq(self.data_o[8] == VALID_FRAME_OUT),
If(bitslip_cnt == 0x0,
If(~self.bitslip_done,
bitslip.eq(1))),
]
self.specials += MultiReg(i=self.bitslip_done, o=csr.bitslip_done, odomain="rio_phy")
# ISERDES
# For 10b deserialization we'll be using two ISERDES modules connected in MASTER-SLAVE mode.
self.specials += Instance("BUFG", i_I=cd_adclk_clkdiv.clk, o_O=self.data_clk_o)
for idx, (line_delayed, dat_o) in enumerate(zip(lines_delayed, self.data_o)):
shift1 = Signal(name="shift1_{}".format(idx))
shift2 = Signal(name="shift2_{}".format(idx))
self.specials += Instance("ISERDESE2",
p_DATA_RATE="DDR",
p_DATA_WIDTH=10,
p_INTERFACE_TYPE="NETWORKING",
p_NUM_CE=1,
p_SERDES_MODE="MASTER",
p_IOBDELAY="BOTH",
o_Q1=dat_o[0], o_Q2=dat_o[1], o_Q3=dat_o[2], o_Q4=dat_o[3],
o_Q5=dat_o[4], o_Q6=dat_o[5], o_Q7=dat_o[6], o_Q8=dat_o[7],
o_SHIFTOUT1=shift1,
o_SHIFTOUT2=shift2,
o_O=Signal(name="output_test_master_{}".format(idx)),
i_DDLY=line_delayed,
i_CLK=lclk_bufio,
i_CLKB=~lclk_bufio,
i_CE1=1,
i_RST=ResetSignal("adclk_clkdiv"),
i_CLKDIV=lclk_bufg,
i_CLKDIVP=0,
i_BITSLIP=bitslip,
i_DYNCLKDIVSEL=0,
i_DYNCLKSEL=0)
self.specials += Instance("ISERDESE2",
p_DATA_RATE="DDR",
p_DATA_WIDTH=10,
p_INTERFACE_TYPE="NETWORKING",
p_NUM_CE=1,
p_SERDES_MODE="SLAVE",
p_IOBDELAY="BOTH",
o_Q3=dat_o[8], o_Q4=dat_o[9],
i_SHIFTIN1=shift1,
i_SHIFTIN2=shift2,
i_CLK=lclk_bufio,
i_CLKB=~lclk_bufio,
i_CE1=1,
i_RST=ResetSignal("adclk_clkdiv"),
i_CLKDIV=lclk_bufg,
i_CLKDIVP=0,
i_BITSLIP=bitslip,
i_DYNCLKDIVSEL=0,
i_DYNCLKSEL=0)
def __init__(self, platform):
self.jreset = CSRStorage(reset=1)
self.jsync = CSRStatus()
ps = JESD204BPhysicalSettings(l=4, m=4, n=16, np=16)
ts = JESD204BTransportSettings(f=2, s=1, k=16, cs=1)
settings = JESD204BSettings(ps, ts, did=0x5a, bid=0x5)
linerate = 6e9
refclk_freq = 150e6
fabric_freq = 150 * 1000 * 1000
refclk = Signal()
self.clock_domains.cd_jesd = ClockDomain()
refclk_pads = platform.request("ad9154_refclk")
self.specials += [
Instance("IBUFDS_GTE2",
i_CEB=0,
i_I=refclk_pads.p,
i_IB=refclk_pads.n,
o_O=refclk),
Instance("BUFG", i_I=refclk, o_O=self.cd_jesd.clk),
AsyncResetSynchronizer(self.cd_jesd, self.jreset.storage),
]
self.cd_jesd.clk.attr.add("keep")
platform.add_period_constraint(self.cd_jesd.clk, 1e9 / refclk_freq)
qpll = GTXQuadPLL(refclk, refclk_freq, linerate)
self.submodules += qpll
self.phys = []
for i in range(4):
phy = JESD204BPhyTX(qpll, platform.request("ad9154_jesd", i),
fabric_freq)
phy.gtx.cd_tx.clk.attr.add("keep")
platform.add_period_constraint(phy.gtx.cd_tx.clk,
40 * 1e9 / linerate)
platform.add_false_path_constraints(self.cd_jesd.clk,
phy.gtx.cd_tx.clk)
self.phys.append(phy)
to_jesd = ClockDomainsRenamer("jesd")
self.submodules.core = to_jesd(
JESD204BCoreTX(self.phys, settings, converter_data_width=32))
self.submodules.control = to_jesd(JESD204BCoreTXControl(self.core))
sync_pads = platform.request("ad9154_sync")
jsync = Signal()
self.specials += [
DifferentialInput(sync_pads.p, sync_pads.n, jsync),
MultiReg(jsync, self.jsync.status)
]
self.comb += [
platform.request("ad9154_txen", 0).eq(1),
platform.request("ad9154_txen", 1).eq(1),
self.core.start.eq(jsync),
platform.request("user_led", 3).eq(jsync),
]
# blinking leds for transceiver reset status
for i in range(4):
counter = Signal(max=fabric_freq)
self.comb += platform.request("user_led", 4 + i).eq(counter[-1])
sync = getattr(self.sync, "phy{}_tx".format(i))
sync += [
counter.eq(counter - 1),
If(counter == 0, counter.eq(fabric_freq - 1))
]
def __init__(self,
S,
D,
MIRROR_BITS,
BITSLIPS,
idelay_overrides={},
iserdes_overrides={}):
"""
Generates all logic necessary for the data lanes, calibration
and phase detection / adjustment
Does not do anything related to clocking.
Inherit and add you own clock.
"""
# LVDS DDR bit clock
self.dco_p = Signal()
self.dco_n = Signal()
# data lanes
self.lvds_data_p = Signal(D)
self.lvds_data_n = Signal(D)
# Control signals (on sample clock domain)
self.bitslip = Signal() # Pulse to rotate
# Phase detector readout (on sample clock domain)
# input for number of sample clock cycles to integrate
self.pd_int_period = Signal(32, reset=2**23)
# outputs integrated Phase detector values (int32)
self.pd_int_phases = [Signal((32, True)) for i in range(D)]
# input to enable auto increment / decrement IDELAY based on PD value
self.id_auto_control = Signal()
# Idelay control inputs (on sample clock domain)
self.id_mux = Signal(max=D + 1) # select a LVDS lane
self.id_inc = Signal(1)
self.id_dec = Signal(1)
# parallel data out, S-bit serdes on D-lanes (on sample clock domain)
self.data_outs = [Signal(S) for i in range(D)]
# Async Reset for clock generation and `sample` clock domain
self.reset = Signal(reset=1)
###
# Common internal signals which must be driven by child
self.clock_domains.sample = ClockDomain(
"sample") # received ADC sample clock
self.ioclk_p = Signal()
self.ioclk_n = Signal()
self.serdesstrobe = Signal()
# -----------------------------
# IDELAY calibration
# -----------------------------
self.idelay_rst = Signal()
self.idelay_cal_m = Signal()
self.idelay_cal_s = Signal()
# High when IDELAY initialization complete
self.initial_tl_done = Signal()
bitslip_initial = Signal()
self.sync.sample += [
self.idelay_cal_m.eq(0),
self.idelay_cal_s.eq(0),
self.idelay_rst.eq(0),
bitslip_initial.eq(0)
]
# Initially calibrate and reset all IDELAY2s
tl = [
(20, [self.idelay_cal_m.eq(1),
self.idelay_cal_s.eq(1)]),
(40, [self.idelay_rst.eq(1)]),
(60, [self.initial_tl_done.eq(1)]),
# Add initial bitslips starting from clk 100. Have I gone too far?
*zip([100 + i * 10 for i in range(BITSLIPS)],
[[bitslip_initial.eq(1)]] * BITSLIPS)
]
# print(tl)
self.sync.sample += timeline(~self.initial_tl_done, tl)
# Periodically re-calibrate all slave IDELAY2s
self.sync.sample += timeline(
self.initial_tl_done,
[(2**26, [self.idelay_cal_s.eq(1)]) # every 0.54 s at 125 MHz
])
# Accumulator regs for phase detector
pd_int_accus = [Signal.like(s) for s in self.pd_int_phases]
pd_int_cnt = Signal(32)
self.sync.sample += [
If(
pd_int_cnt >= self.pd_int_period,
pd_int_cnt.eq(0),
).Elif(
self.
initial_tl_done, # only start counting when idelays are calibrated
pd_int_cnt.eq(pd_int_cnt + 1))
]
# -----------------------------
# Default block parameters
# -----------------------------
self.idelay_default = {
"p_SIM_TAPDELAY_VALUE": 49,
"p_IDELAY_VALUE": 0, # A faire: make CSR
"p_IDELAY2_VALUE": 0,
"p_ODELAY_VALUE": 0,
"p_IDELAY_MODE": "NORMAL",
"p_COUNTER_WRAPAROUND": "WRAPAROUND",
"p_DELAY_SRC": "IDATAIN",
"i_T": 1,
"i_ODATAIN": 0,
"i_IOCLK0": self.ioclk_p,
"i_IOCLK1": self.ioclk_n,
"i_CLK": ClockSignal("sample"),
"i_RST": self.idelay_rst
}
self.idelay_default.update(idelay_overrides)
self.iserdes_default = {
"p_DATA_WIDTH": S,
"p_BITSLIP_ENABLE": "TRUE",
"p_INTERFACE_TYPE": "RETIMED",
"i_CE0": 1,
"i_CLK0": self.ioclk_p,
"i_CLK1": self.ioclk_n,
"i_IOCE": self.serdesstrobe,
"i_RST": ~self.initial_tl_done,
"i_CLKDIV": ClockSignal("sample"),
"i_BITSLIP": self.bitslip | bitslip_initial
}
self.iserdes_default.update(iserdes_overrides)
for i in range(D):
lvds_data = Signal()
lvds_data_m = Signal()
lvds_data_s = Signal()
id_CE = Signal()
id_INC = Signal()
# -------------------------------------
# Idelay control (auto / manual)
# -------------------------------------
self.sync.sample += [
# Mux the IDELAY control inputs
If(
self.id_auto_control,
id_CE.
eq((pd_int_cnt == 1) &
# Adjust IDELAYS at end of each accumulator cycle
(self.pd_int_phases[i] != 0)
# Adjust IDELAYs when consistently early / late
# during _all_ accumulator cycles
# ((self.pd_int_phases[i] >= self.pd_int_period) |
# (self.pd_int_phases[i] <= -self.pd_int_period))
),
id_INC.eq(self.pd_int_phases[i] < 0)).Else(
id_CE.eq((self.id_mux == i)
& (self.id_inc ^ self.id_dec)),
id_INC.eq(self.id_inc))
]
self.specials += DifferentialInput(self.lvds_data_p[i],
self.lvds_data_n[i], lvds_data)
self.specials += Instance("IODELAY2",
p_SERDES_MODE="MASTER",
p_IDELAY_TYPE="DIFF_PHASE_DETECTOR",
i_IDATAIN=lvds_data,
i_CAL=self.idelay_cal_m,
i_CE=id_CE,
i_INC=id_INC,
o_DATAOUT=lvds_data_m,
**self.idelay_default)
self.specials += Instance("IODELAY2",
p_SERDES_MODE="SLAVE",
p_IDELAY_TYPE="DIFF_PHASE_DETECTOR",
i_IDATAIN=lvds_data,
i_CAL=self.idelay_cal_s,
i_CE=id_CE,
i_INC=id_INC,
o_DATAOUT=lvds_data_s,
**self.idelay_default)
cascade_up = Signal()
cascade_down = Signal()
tempData = Signal(8)
pdValid = Signal()
pdInc = Signal()
pdAcc = pd_int_accus[i]
self.specials += Instance(
"ISERDES2",
p_SERDES_MODE="MASTER",
i_D=lvds_data_m,
i_SHIFTIN=cascade_up,
o_Q4=tempData[7],
o_Q3=tempData[6],
o_Q2=tempData[5],
o_Q1=tempData[4],
o_SHIFTOUT=cascade_down,
# The phase detector outputs
o_VALID=pdValid,
o_INCDEC=pdInc,
**self.iserdes_default)
# Accumulate increment / decrement pulses
self.sync.sample += [
If(
pd_int_cnt >= self.pd_int_period,
# Latch accumulator value into output registers
self.pd_int_phases[i].eq(pdAcc),
# Reset accumulators
pdAcc.eq(0)).Elif(
pdValid & self.initial_tl_done,
# Accumulate
If(pdInc,
pdAcc.eq(pdAcc - 1)).Else(pdAcc.eq(pdAcc + 1)))
]
self.specials += Instance("ISERDES2",
p_SERDES_MODE="SLAVE",
i_D=lvds_data_s,
i_SHIFTIN=cascade_down,
o_Q4=tempData[3],
o_Q3=tempData[2],
o_Q2=tempData[1],
o_Q1=tempData[0],
o_SHIFTOUT=cascade_up,
**self.iserdes_default)
if MIRROR_BITS:
self.comb += self.data_outs[i].eq(tempData[::-1])
else:
self.comb += self.data_outs[i].eq(tempData)
def __init__(self, pins, pins_n):
n_bits = 16 # bits per dac data word
n_channels = 32 # channels per fastino
n_div = 7 # bits per lane and word
assert n_div == 7
n_frame = 14 # word per frame
n_lanes = len(pins.mosi) # number of data lanes
n_checksum = 12 # checksum bits
n_addr = 4 # readback address bits
n_word = n_lanes*n_div
n_body = n_word*n_frame - (n_frame//2 + 1) - n_checksum
# dac data words
self.dacs = [Signal(n_bits) for i in range(n_channels)]
# dac update enable
self.enable = Signal(n_channels)
# configuration word
self.cfg = Signal(20)
# readback data
self.dat_r = Signal(n_frame//2*(1 << n_addr))
# data load synchronization event
self.stb = Signal()
# # #
# crc-12 telco
self.submodules.crc = LiteEthMACCRCEngine(
data_width=2*n_lanes, width=n_checksum, polynom=0x80f)
addr = Signal(4)
body_ = Cat(self.cfg, addr, self.enable, self.dacs)
assert len(body_) == n_body
body = Signal(n_body)
self.comb += body.eq(body_)
words_ = []
j = 0
for i in range(n_frame): # iterate over words
if i == 0: # data and checksum
k = n_word - n_checksum
elif i == 1: # marker
words_.append(C(1))
k = n_word - 1
elif i < n_frame//2 + 2: # marker
words_.append(C(0))
k = n_word - 1
else: # full word
k = n_word
# append corresponding frame body bits
words_.append(body[j:j + k])
j += k
words_ = Cat(words_)
assert len(words_) == n_frame*n_word - n_checksum
words = Signal(len(words_))
self.comb += words.eq(words_)
clk = Signal(n_div, reset=0b1100011)
clk_stb = Signal()
i_frame = Signal(max=n_div*n_frame//2) # DDR
frame_stb = Signal()
sr = [Signal(n_frame*n_div - n_checksum//n_lanes, reset_less=True)
for i in range(n_lanes)]
assert len(Cat(sr)) == len(words)
# DDR bits for each register
ddr_data = Cat([sri[-2] for sri in sr], [sri[-1] for sri in sr])
self.comb += [
# assert one cycle ahead
clk_stb.eq(~clk[0] & clk[-1]),
# double period because of DDR
frame_stb.eq(i_frame == n_div*n_frame//2 - 1),
# LiteETHMACCRCEngine takes data LSB first
self.crc.data[::-1].eq(ddr_data),
self.stb.eq(frame_stb & clk_stb),
]
miso = Signal()
miso_sr = Signal(n_frame, reset_less=True)
self.sync.rio_phy += [
# shift 7 bit clock pattern by two bits each DDR cycle
clk.eq(Cat(clk[-2:], clk)),
[sri[2:].eq(sri) for sri in sr],
self.crc.last.eq(self.crc.next),
If(clk[:2] == 0, # TODO: tweak MISO sampling
miso_sr.eq(Cat(miso, miso_sr)),
),
If(~frame_stb,
i_frame.eq(i_frame + 1),
),
If(frame_stb & clk_stb,
i_frame.eq(0),
self.crc.last.eq(0),
# transpose, load
Cat(sr).eq(Cat(words[mm::n_lanes] for mm in range(n_lanes))),
Array([self.dat_r[i*n_frame//2:(i + 1)*n_frame//2]
for i in range(1 << len(addr))])[addr].eq(miso_sr),
addr.eq(addr + 1),
),
If(i_frame == n_div*n_frame//2 - 2,
# inject crc
ddr_data.eq(self.crc.next),
),
]
clk_ddr = Signal()
miso0 = Signal()
self.specials += [
DDROutput(clk[-1], clk[-2], clk_ddr, ClockSignal("rio_phy")),
DifferentialOutput(clk_ddr, pins.clk, pins_n.clk),
DifferentialInput(pins.miso, pins_n.miso, miso0),
MultiReg(miso0, miso, "rio_phy"),
]
for sri, ddr, mp, mn in zip(
sr, Signal(n_lanes), pins.mosi, pins_n.mosi):
self.specials += [
DDROutput(sri[-1], sri[-2], ddr, ClockSignal("rio_phy")),
DifferentialOutput(ddr, mp, mn),
]