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rtio/ttl_serdes: cleanup/rewrite

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This commit is contained in:
Sebastien Bourdeauducq 2015-07-27 00:01:41 +08:00
parent d90dff4ef1
commit 940aa815dd
2 changed files with 238 additions and 257 deletions
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66
artiq/gateware/rtio/phy/ttl_serdes_7series.py
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@ -1,58 +1,70 @@
from migen.fhdl.std import * from migen.fhdl.std import *
from artiq.gateware.rtio.phy import ttl_serdes_generic from artiq.gateware.rtio.phy import ttl_serdes_generic
class OSerdese2(Module): class _OSERDESE2_8X(Module):
def __init__(self, pad): def __init__(self, pad):
self.o = o = Signal(8) self.o = Signal(8)
self.oe = oe = Signal() self.t_in = Signal()
self.t = t = Signal() self.t_out = Signal()
# # #
o = self.o
self.specials += Instance("OSERDESE2", p_DATA_RATE_OQ="DDR", self.specials += Instance("OSERDESE2", p_DATA_RATE_OQ="DDR",
p_DATA_RATE_TQ="DDR", p_DATA_WIDTH=8, p_DATA_RATE_TQ="DDR", p_DATA_WIDTH=8,
p_TRISTATE_WIDTH=1, o_OQ=pad, o_TQ=t, p_TRISTATE_WIDTH=1,
o_OQ=pad, o_TQ=self.t_out,
i_CLK=ClockSignal("rtiox4"), i_CLK=ClockSignal("rtiox4"),
i_CLKDIV=ClockSignal("rio_phy"), i_CLKDIV=ClockSignal("rio_phy"),
i_D1=o[0], i_D2=o[1], i_D3=o[2], i_D4=o[3], i_D1=o[0], i_D2=o[1], i_D3=o[2], i_D4=o[3],
i_D5=o[4], i_D6=o[5], i_D7=o[6], i_D8=o[7], i_D5=o[4], i_D6=o[5], i_D7=o[6], i_D8=o[7],
i_TCE=1, i_OCE=1, i_RST=ResetSignal(), i_TCE=1, i_OCE=1, i_RST=0,
i_T1=~oe) i_T1=self.t_in)
class IOSerdese2(Module): class _IOSERDESE2_8X(Module):
def __init__(self, pad): def __init__(self, pad):
ts = TSTriple() self.o = Signal(8)
self.o = o = Signal(8) self.i = Signal(8)
self.oe = oe = Signal() self.oe = Signal()
self.i = i = Signal(8)
self.specials += ts.get_tristate(pad)
# # #
pad_i = Signal()
pad_o = Signal()
i = self.i
self.specials += Instance("ISERDESE2", p_DATA_RATE="DDR", self.specials += Instance("ISERDESE2", p_DATA_RATE="DDR",
p_DATA_WIDTH=8, p_DATA_WIDTH=8,
p_INTERFACE_TYPE="NETWORKING", p_NUM_CE=1, p_INTERFACE_TYPE="NETWORKING", p_NUM_CE=1,
o_Q1=i[7], o_Q2=i[6], o_Q3=i[5], o_Q4=i[4], o_Q1=i[7], o_Q2=i[6], o_Q3=i[5], o_Q4=i[4],
o_Q5=i[3], o_Q6=i[2], o_Q7=i[1], o_Q8=i[0], o_Q5=i[3], o_Q6=i[2], o_Q7=i[1], o_Q8=i[0],
i_D=ts.i, i_CLK=ClockSignal("rtiox4"), i_D=pad_i,
i_CE1=1, i_RST=ResetSignal(), i_CLK=ClockSignal("rtiox4"),
i_CLKB=~ClockSignal("rtiox4"),
i_CE1=1, i_RST=0,
i_CLKDIV=ClockSignal("rio_phy")) i_CLKDIV=ClockSignal("rio_phy"))
oserdes = _OSERDESE2_8X(pad_o)
oserdes = OSerdese2(ts.o)
self.submodules += oserdes self.submodules += oserdes
self.specials += Instance("IOBUF",
i_I=pad_o, o_O=pad_i, i_T=oserdes.t_out,
io_IO=pad)
self.comb += [ self.comb += [
ts.oe.eq(~oserdes.t), oserdes.t_in.eq(~self.oe),
oserdes.o.eq(o), oserdes.o.eq(self.o)
oserdes.oe.eq(oe)
] ]
class Output(Module): class Output_8X(ttl_serdes_generic.Output):
def __init__(self, pad): def __init__(self, pad):
serdes = OSerdese2(pad) serdes = _OSERDESE2_8X(pad)
self.submodules += ttl_serdes_generic.Output(serdes, fine_ts_width=3) self.submodules += serdes
ttl_serdes_generic.Output.__init__(self, serdes)
class Inout(Module): class Inout_8X(ttl_serdes_generic.Inout):
def __init__(self, pad): def __init__(self, pad):
serdes = IOSerdese2(pad) serdes = _IOSERDESE2_8X(pad)
self.submodules += ttl_serdes_generic.InOut(serdes, fine_ts_width=3) self.submodules += serdes
ttl_serdes_generic.Inout.__init__(self, serdes)

397
artiq/gateware/rtio/phy/ttl_serdes_generic.py
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@ -1,304 +1,273 @@
from migen.fhdl.std import * from migen.fhdl.std import *
from artiq.gateware.rtio import rtlink
from migen.genlib.coding import PriorityEncoder from migen.genlib.coding import PriorityEncoder
from artiq.gateware.rtio import rtlink
def _mk_edges(w, direction):
l = [(1 << i) - 1 for i in range(w)]
if direction == "rising":
l = [2**w - 1 ^ x for x in l]
elif direction == "falling":
pass
else:
raise ValueError
return l
class _SerdesDriver(Module):
def __init__(self, serdes_o, stb, data, fine_ts, override_en, override_o):
previous_data = Signal()
serdes_width = flen(serdes_o)
edges = Array(_mk_edges(serdes_width, "rising"))
edges_n = Array(_mk_edges(serdes_width, "falling"))
self.sync.rio_phy += [
If(stb, previous_data.eq(data)),
If(override_en,
serdes_o.eq(Replicate(override_o, serdes_width))
).Else(
If(stb & ~previous_data & data,
serdes_o.eq(edges[fine_ts]),
).Elif(stb & previous_data & ~data,
serdes_o.eq(edges_n[fine_ts]),
).Else(
serdes_o.eq(Replicate(previous_data, serdes_width)),
)
)
]
class Output(Module): class Output(Module):
def __init__(self, serdes, fine_ts_width=0): def __init__(self, serdes):
self.rtlink = rtlink.Interface(rtlink.OInterface(1, fine_ts_width= self.rtlink = rtlink.Interface(
fine_ts_width)) rtlink.OInterface(1, fine_ts_width=log2_int(flen(serdes.o))))
self.probes = [serdes.o[-1]]
serdes_width = 2**fine_ts_width
o = Signal()
previous_o = Signal()
override_en = Signal() override_en = Signal()
override_o = Signal() override_o = Signal()
io_o = Signal()
self.overrides = [override_en, override_o] self.overrides = [override_en, override_o]
io = serdes # # #
self.submodules += io
if fine_ts_width > 0: self.submodules += _SerdesDriver(
timestamp = Signal(fine_ts_width) serdes.o,
self.rtlink.o.stb, self.rtlink.o.data, self.rtlink.o.fine_ts,
# dout override_en, override_o)
edges = Array([0xff ^ ((1 << i) - 1) for i in range(serdes_width)])
edge_out = Signal(serdes_width)
edge_out_n = Signal(serdes_width)
rise_out = Signal()
fall_out = Signal()
self.comb += [
timestamp.eq(self.rtlink.o.fine_ts),
edge_out.eq(edges[timestamp]),
edge_out_n.eq(~edge_out),
rise_out.eq(~previous_o & o),
fall_out.eq(previous_o & ~o),
If(override_en,
io.o.eq(override_o)
).Else(
If(rise_out,
io.o.eq(edge_out),
).Elif(fall_out,
io.o.eq(edge_out_n),
).Else(
io.o.eq(Replicate(o, serdes_width)),
)
)
]
else:
self.comb += [
If(override_en,
io_o.eq(override_o)
).Else(
io_o.eq(o)
)
]
self.comb += [
io.o.eq(io_o),
]
self.sync.rio_phy += [
If(self.rtlink.o.stb,
o.eq(self.rtlink.o.data),
),
previous_o.eq(o),
]
class Inout(Module): class Inout(Module):
def __init__(self, serdes, fine_ts_width=0): def __init__(self, serdes):
serdes_width = flen(serdes.o)
assert flen(serdes.i) == serdes_width
self.rtlink = rtlink.Interface( self.rtlink = rtlink.Interface(
rtlink.OInterface(2, 2, fine_ts_width=fine_ts_width), rtlink.OInterface(2, 2, fine_ts_width=log2_int(serdes_width)),
rtlink.IInterface(1, fine_ts_width=fine_ts_width)) rtlink.IInterface(1, fine_ts_width=log2_int(serdes_width)))
self.probes = [] self.probes = [serdes.i[-1], serdes.oe]
serdes_width = 2**fine_ts_width
self.io = io = serdes
self.submodules += io
io_o = Signal(serdes_width)
io_i = Signal(serdes_width)
o = Signal()
rising = Signal()
falling = Signal()
i0 = Signal()
self.oe = oe = Signal()
override_en = Signal() override_en = Signal()
override_o = Signal() override_o = Signal()
override_oe = Signal() override_oe = Signal()
self.sensitivity = Signal(2)
self.overrides = [override_en, override_o, override_oe] self.overrides = [override_en, override_o, override_oe]
previous_o = Signal()
if fine_ts_width > 0: # # #
# Input
self.submodules.pe = pe = PriorityEncoder(serdes_width)
self.sync.rio_phy += i0.eq(io_i[-1])
self.comb += [
io_i.eq(io.i),
rising.eq(~i0 & io_i[-1]),
falling.eq(i0 & ~io_i[-1]),
pe.i.eq(io_i ^ Replicate(falling, serdes_width)),
self.rtlink.i.data.eq(io_i[-1]),
self.rtlink.i.fine_ts.eq(pe.o),
]
# Output # Output
timestamp = Signal(fine_ts_width) self.submodules += _SerdesDriver(
edges = Array([0xff ^ ((1 << i) - 1) for i in range(serdes_width)]) serdes_o=serdes.o,
edge_out = Signal(serdes_width) stb=self.rtlink.o.stb & (self.rtlink.o.address == 0),
edge_out_n = Signal(serdes_width) data=self.rtlink.o.data[0],
rise_out = Signal() fine_ts=self.rtlink.o.fine_ts,
fall_out = Signal() override_en=override_en, override_o=override_o)
self.comb += [
timestamp.eq(self.rtlink.o.fine_ts),
edge_out.eq(edges[timestamp]),
edge_out_n.eq(~edge_out),
rise_out.eq(~previous_o & o),
fall_out.eq(previous_o & ~o),
If(override_en,
io_o.eq(override_o),
).Else(
If(rise_out,
io_o.eq(edge_out),
).Elif(fall_out,
io_o.eq(edge_out_n),
).Else(
io_o.eq(Replicate(o, serdes_width)),
)
)
]
else:
self.comb += [
io_i.eq(io.i),
rising.eq(~i0 & io_i),
falling.eq(i0 & ~io_i),
If(override_en,
io_o.eq(override_o)
).Else(
io_o.eq(o),
),
self.rtlink.i.data.eq(io_i),
]
self.comb += [
io.oe.eq(oe),
io.o.eq(io_o),
self.rtlink.i.stb.eq(
(self.sensitivity[0] & rising) |
(self.sensitivity[1] & falling)
),
]
oe_k = Signal()
self.sync.rio_phy += [ self.sync.rio_phy += [
If(self.rtlink.o.stb, If(self.rtlink.o.stb & (self.rtlink.o.address == 1),
If(self.rtlink.o.address == 0, o.eq(self.rtlink.o.data[0])), oe_k.eq(self.rtlink.o.data[0])),
If(self.rtlink.o.address == 1, oe.eq(self.rtlink.o.data[0])),
),
If(override_en, If(override_en,
oe.eq(override_oe) serdes.oe.eq(override_oe)
), ).Else(
previous_o.eq(o), serdes.oe.eq(oe_k)
]
self.sync.rio += [
If(self.rtlink.o.stb & (self.rtlink.o.address == 2),
self.sensitivity.eq(self.rtlink.o.data)
) )
] ]
class FakeSerdes(Module): # Input
sensitivity = Signal(2)
self.sync.rio += If(self.rtlink.o.stb & (self.rtlink.o.address == 2),
sensitivity.eq(self.rtlink.o.data))
i = serdes.i[-1]
i_d = Signal()
self.sync.rio_phy += [
i_d.eq(i),
self.rtlink.i.stb.eq(
(sensitivity[0] & ( i & ~i_d)) |
(sensitivity[1] & (~i & i_d))
),
self.rtlink.i.data.eq(i),
]
pe = PriorityEncoder(serdes_width)
self.submodules += pe
self.comb += pe.i.eq(serdes.i ^ Replicate(i_d, serdes_width))
self.sync.rio_phy += self.rtlink.i.fine_ts.eq(pe.o)
class _FakeSerdes(Module):
def __init__(self): def __init__(self):
self.o = o = Signal(8) self.o = Signal(8)
self.oe = oe = Signal(8) self.i = Signal(8)
self.oe = Signal()
class FakeIOSerdes(Module): class _OutputTB(Module):
def __init__(self): def __init__(self):
self.o = o = Signal(8) serdes = _FakeSerdes()
self.oe = oe = Signal(8) self.submodules.dut = RenameClockDomains(Output(serdes),
self.i = i = Signal(8)
class OutputTB(Module):
def __init__(self):
serdes = FakeSerdes()
self.o = RenameClockDomains(Output(serdes, fine_ts_width=3),
{"rio_phy": "sys"}) {"rio_phy": "sys"})
self.submodules += self.o
def gen_simulation(self, selfp): def gen_simulation(self, selfp):
selfp.dut.rtlink.o.data = 1
selfp.dut.rtlink.o.fine_ts = 1
selfp.dut.rtlink.o.stb = 1
yield yield
selfp.o.rtlink.o.data = 1 selfp.dut.rtlink.o.stb = 0
selfp.o.rtlink.o.fine_ts = 1
selfp.o.rtlink.o.stb = 1
yield yield
selfp.o.rtlink.o.stb = 0 selfp.dut.rtlink.o.data = 0
selfp.dut.rtlink.o.fine_ts = 2
selfp.dut.rtlink.o.stb = 1
yield yield
selfp.o.rtlink.o.data = 0
selfp.o.rtlink.o.fine_ts = 2
selfp.o.rtlink.o.stb = 1
yield yield
selfp.o.rtlink.o.data = 1 selfp.dut.rtlink.o.data = 1
selfp.o.rtlink.o.fine_ts = 7 selfp.dut.rtlink.o.fine_ts = 7
yield selfp.dut.rtlink.o.stb = 1
for _ in range(6):
while True: # note that stb stays active; output should not change
yield yield
class InoutTB(Module): class _InoutTB(Module):
def __init__(self): def __init__(self):
ioserdes = FakeIOSerdes() self.serdes = _FakeSerdes()
self.io = RenameClockDomains(Inout(ioserdes, fine_ts_width=3), self.submodules.dut = RenameClockDomains(Inout(self.serdes),
{"rio_phy": "sys"}) {"rio_phy": "sys",
self.submodules += self.io "rio": "sys"})
def check_input(self, selfp, stb, fine_ts=None): def check_input(self, selfp, stb, fine_ts=None):
if stb != selfp.io.rtlink.i.stb: if stb != selfp.dut.rtlink.i.stb:
print("KO rtlink.i.stb should be {} but is {}" print("KO rtlink.i.stb should be {} but is {}"
.format(stb, selfp.io.rtlink.i.stb)) .format(stb, selfp.dut.rtlink.i.stb))
elif fine_ts is not None and fine_ts != selfp.io.rtlink.i.fine_ts: elif fine_ts is not None and fine_ts != selfp.dut.rtlink.i.fine_ts:
print("KO rtlink.i.fine_ts should be {} but is {}" print("KO rtlink.i.fine_ts should be {} but is {}"
.format(fine_ts, selfp.io.rtlink.i.fine_ts)) .format(fine_ts, selfp.dut.rtlink.i.fine_ts))
else: else:
print("OK") print("OK")
def check_output(self, selfp, data): def check_output(self, selfp, data):
if selfp.io.io.o != data: if selfp.serdes.o != data:
print("KO io.o should be {} but is {}".format(data, selfp.io.io.o)) print("KO io.o should be {} but is {}".format(data, selfp.serdes.o))
else: else:
print("OK") print("OK")
def check_output_enable(self, selfp, oe): def check_output_enable(self, selfp, oe):
if selfp.io.io.oe != oe: if selfp.serdes.oe != oe:
print("KO io.oe should be {} but is {}".format(oe, selfp.io.io.oe)) print("KO io.oe should be {} but is {}".format(oe, selfp.serdes.oe))
else: else:
print("OK") print("OK")
def gen_simulation(self, selfp): def gen_simulation(self, selfp):
selfp.io.sensitivity = 0b11 # rising + falling selfp.dut.rtlink.o.address = 2
selfp.dut.rtlink.o.data = 0b11
selfp.dut.rtlink.o.stb = 1 # set sensitivity to rising + falling
yield
selfp.dut.rtlink.o.stb = 0
self.check_output_enable(selfp, 0) self.check_output_enable(selfp, 0)
yield yield
selfp.io.io.i = 0b11111110 # rising edge at fine_ts = 1
selfp.serdes.i = 0b11111110 # rising edge at fine_ts = 1
yield
selfp.serdes.i = 0b11111111
yield yield
self.check_input(selfp, stb=1, fine_ts=1) self.check_input(selfp, stb=1, fine_ts=1)
selfp.io.io.i = 0b01111111 # falling edge at fine_ts = 7
selfp.serdes.i = 0b01111111 # falling edge at fine_ts = 7
yield
selfp.serdes.i = 0b00000000
yield yield
self.check_input(selfp, stb=1, fine_ts=7) self.check_input(selfp, stb=1, fine_ts=7)
selfp.io.io.i = 0b11000000 # rising edge at fine_ts = 6
selfp.serdes.i = 0b11000000 # rising edge at fine_ts = 6
yield
selfp.serdes.i = 0b11111111
yield yield
self.check_input(selfp, stb=1, fine_ts=6) self.check_input(selfp, stb=1, fine_ts=6)
selfp.io.sensitivity = 0b01 # rising
selfp.io.io.i = 0b00001111 # falling edge at fine_ts = 4 selfp.dut.rtlink.o.address = 2
selfp.dut.rtlink.o.data = 0b11
selfp.dut.rtlink.o.stb = 1 # set sensitivity to rising only
yield
selfp.dut.rtlink.o.stb = 0
yield
selfp.serdes.i = 0b00001111 # falling edge at fine_ts = 4
yield yield
self.check_input(selfp, stb=0) # no strobe, sensitivity is rising edge self.check_input(selfp, stb=0) # no strobe, sensitivity is rising edge
selfp.io.io.i = 0b11110000 # rising edge at fine_ts = 4
selfp.serdes.i = 0b11110000 # rising edge at fine_ts = 4
yield yield
self.check_input(selfp, stb=1, fine_ts=4) self.check_input(selfp, stb=1, fine_ts=4)
selfp.io.rtlink.o.address = 1
selfp.io.rtlink.o.data = 1 selfp.dut.rtlink.o.address = 1
selfp.io.rtlink.o.stb = 1 # set Output Enable to 1 selfp.dut.rtlink.o.data = 1
selfp.dut.rtlink.o.stb = 1 # set Output Enable to 1
yield
selfp.dut.rtlink.o.stb = 0
yield yield
selfp.io.rtlink.o.address = 0
selfp.io.rtlink.o.data = 1
selfp.io.rtlink.o.fine_ts = 3 # rising edge at fine_ts = 3
yield yield
self.check_output_enable(selfp, 1) self.check_output_enable(selfp, 1)
selfp.dut.rtlink.o.address = 0
selfp.dut.rtlink.o.data = 1
selfp.dut.rtlink.o.fine_ts = 3
selfp.dut.rtlink.o.stb = 1 # rising edge at fine_ts = 3
yield
selfp.dut.rtlink.o.stb = 0
yield yield
selfp.io.rtlink.o.data = 0
selfp.io.rtlink.o.fine_ts = 0 # falling edge at fine_ts = 0
self.check_output(selfp, data=0b11111000) self.check_output(selfp, data=0b11111000)
yield yield
self.check_output(selfp, data=0xFF) # stays at 1 self.check_output(selfp, data=0xFF) # stays at 1
selfp.dut.rtlink.o.data = 0
selfp.dut.rtlink.o.fine_ts = 0
selfp.dut.rtlink.o.stb = 1 # falling edge at fine_ts = 0
yield yield
selfp.io.rtlink.o.data = 1 selfp.dut.rtlink.o.stb = 0
selfp.io.rtlink.o.fine_ts = 7
self.check_output(selfp, data=0)
yield yield
self.check_output(selfp, data=0) self.check_output(selfp, data=0)
yield
self.check_output(selfp, data=0)
selfp.dut.rtlink.o.data = 1
selfp.dut.rtlink.o.fine_ts = 7
selfp.dut.rtlink.o.stb = 1 # rising edge at fine_ts = 7
yield
selfp.dut.rtlink.o.stb = 0
yield yield
self.check_output(selfp, data=0b10000000) self.check_output(selfp, data=0b10000000)
while True:
yield
if __name__ == "__main__": if __name__ == "__main__":
import sys import sys
from migen.sim.generic import Simulator, TopLevel from migen.sim.generic import Simulator, TopLevel
from migen.sim import icarus
if len(sys.argv) <= 1: if len(sys.argv) != 2:
print("You should run this script with either InoutTB() or OutputTB() " print("Incorrect command line")
"arg")
sys.exit(1) sys.exit(1)
with Simulator(eval(sys.argv[1]), TopLevel("top.vcd", clk_period=int(1/0.125)), cls = {
icarus.Runner(keep_files=False,)) as s: "output": _OutputTB,
s.run(200) "inout": _InoutTB
}[sys.argv[1]]
with Simulator(cls(), TopLevel("top.vcd", clk_period=int(1/0.125))) as s:
s.run()