phaser: initial

This commit is contained in:
Robert Jördens 2020-08-21 11:31:26 +00:00
parent 5f6aa02b61
commit aa0154d8e2
4 changed files with 207 additions and 2 deletions

View File

@ -5,7 +5,7 @@ from migen.genlib.io import DifferentialOutput
from artiq.gateware import rtio
from artiq.gateware.rtio.phy import spi2, ad53xx_monitor, grabber
from artiq.gateware.suservo import servo, pads as servo_pads
from artiq.gateware.rtio.phy import servo as rtservo, fastino
from artiq.gateware.rtio.phy import servo as rtservo, fastino, phaser
def _eem_signal(i):
@ -613,7 +613,8 @@ class Fastino(_EEM):
Subsignal("clk", Pins(_eem_pin(eem, 0, pol))),
Subsignal("mosi", Pins(*(_eem_pin(eem, i, pol)
for i in range(1, 7)))),
Subsignal("miso", Pins(_eem_pin(eem, 7, pol))),
Subsignal("miso", Pins(_eem_pin(eem, 7, pol)),
Misc("DIFF_TERM=TRUE")),
IOStandard(iostandard),
) for pol in "pn"]
@ -626,3 +627,29 @@ class Fastino(_EEM):
log2_width=0)
target.submodules += phy
target.rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=4))
class Phaser(_EEM):
@staticmethod
def io(eem, iostandard="LVDS_25"):
return [
("phaser{}_ser_{}".format(eem, pol), 0,
Subsignal("clk", Pins(_eem_pin(eem, 0, pol))),
Subsignal("mosi", Pins(*(_eem_pin(eem, i, pol)
for i in range(1, 7)))),
Subsignal("miso", Pins(_eem_pin(eem, 7, pol)),
Misc("DIFF_TERM=TRUE")),
IOStandard(iostandard),
) for pol in "pn"]
@classmethod
def add_std(cls, target, eem, iostandard="LVDS_25"):
cls.add_extension(target, eem, iostandard=iostandard)
phy = phaser.Phaser(target.platform.request("phaser{}_ser_p".format(eem)),
target.platform.request("phaser{}_ser_n".format(eem)))
target.submodules += phy
target.rtio_channels.extend([
rtio.Channel(phy.config, ififo_depth=4),
rtio.Channel(phy.data),
])

View File

@ -0,0 +1,120 @@
from migen import *
from migen.genlib.cdc import MultiReg
from migen.genlib.io import DifferentialOutput, DifferentialInput, DDROutput
from misoc.cores.liteeth_mini.mac.crc import LiteEthMACCRCEngine
from artiq.gateware.rtio import rtlink
class SerDes(Module):
# crc-12 telco: 0x80f
def __init__(self, pins, pins_n, t_clk=7, d_clk=0b1100011,
n_frame=14, n_crc=12, poly=0x80f):
"""DDR fast link.
* One word clock lane with `t_clk` period.
* Multiple data lanes at DDR speed.
* One return data lane at slower speed.
* n_frame//2 - 1 marker bits are used to provide framing.
* `n_frame` words per frame
* `t_clk` bits per clk cycle with pattern `d_clk`
* `n_crc` CRC bits per frame
"""
n_lanes = len(pins.mosi) # number of data lanes
n_word = n_lanes*t_clk
n_body = n_word*n_frame - (n_frame//2 + 1) - n_crc
# frame data
self.payload = Signal(n_body)
# readback data
self.readback = Signal(n_frame, reset_less=True)
# data load synchronization event
self.stb = Signal()
# # #
self.submodules.crc = LiteEthMACCRCEngine(
data_width=2*n_lanes, width=n_crc, polynom=poly)
words_ = []
j = 0
for i in range(n_frame): # iterate over words
if i == 0: # data and checksum
k = n_word - n_crc
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(self.payload[j:j + k])
j += k
words_ = Cat(words_)
assert len(words_) == n_frame*n_word - n_crc
words = Signal(len(words_))
self.comb += words.eq(words_)
clk = Signal(t_clk, reset=d_clk)
clk_stb = Signal()
i_frame = Signal(max=t_clk*n_frame//2) # DDR
frame_stb = Signal()
# big shift register for clk and mosi
sr = [Signal(n_frame*t_clk - n_crc//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 == t_clk*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 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))),
self.readback.eq(miso_sr),
),
If(i_frame == t_clk*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),
]

View File

@ -0,0 +1,51 @@
from migen import *
from artiq.gateware.rtio import rtlink
from .fastlink import SerDes
class Phaser(Module):
def __init__(self, pins, pins_n):
self.config = rtlink.Interface(
rtlink.OInterface(data_width=8, address_width=8,
enable_replace=False),
rtlink.IInterface(data_width=8))
self.data = rtlink.Interface(
rtlink.OInterface(data_width=32, address_width=8,
enable_replace=True))
self.submodules.serializer = SerDes(
pins, pins_n, t_clk=8, d_clk=0b00001111,
n_frame=10, n_crc=6, poly=0x2f)
header = Record([
("we", 1),
("addr", 7),
("data", 8),
("type", 4)
])
n_channels = 2
n_samples = 8
body = [[(Signal(14), Signal(14)) for i in range(n_channels)]
for j in range(n_samples)]
assert len(Cat(header.raw_bits(), body)) == \
len(self.serializer.payload)
self.comb += self.serializer.payload.eq(Cat(header.raw_bits(), body))
self.sync.rio_phy += [
If(self.serializer.stb,
header.we.eq(0),
),
If(self.config.o.stb,
header.we.eq(~self.config.o.address[-1]),
header.addr.eq(self.config.o.address),
header.data.eq(self.config.o.data),
header.type.eq(0), # reserved
),
]
self.sync.rtio += [
self.config.i.stb.eq(self.config.o.stb &
self.config.o.address[-1]),
self.config.i.data.eq(self.serializer.readback),
]

View File

@ -112,6 +112,12 @@ def peripheral_fastino(module, peripheral):
eem.Fastino.add_std(module, peripheral["ports"][0])
def peripheral_phaser(module, peripheral):
if len(peripheral["ports"]) != 1:
raise ValueError("wrong number of ports")
eem.Phaser.add_std(module, peripheral["ports"][0])
peripheral_processors = {
"dio": peripheral_dio,
"urukul": peripheral_urukul,
@ -122,6 +128,7 @@ peripheral_processors = {
"grabber": peripheral_grabber,
"mirny": peripheral_mirny,
"fastino": peripheral_fastino,
"phaser": peripheral_phaser,
}