litedram/test/test_dfi.py

490 lines
18 KiB
Python

#
# This file is part of LiteDRAM.
#
# Copyright (c) 2021 Antmicro <www.antmicro.com>
# SPDX-License-Identifier: BSD-2-Clause
import os
import unittest
from collections import defaultdict
from migen import *
from litex.build.sim import gtkwave as gtkw
from litedram.phy.dfi import Interface as DFIInterface, DFIRateConverter
from litedram.phy.utils import Serializer, Deserializer
from test.phy_common import DFISequencer, dfi_reset_values, run_simulation as _run_simulation
def run_simulation(ratio, *args, **kwargs):
clkdiv = "sys"
clk = f"sys{ratio}x"
kwargs["clocks"] = {
clkdiv: (4*ratio, 4*ratio/2 - 1),
clk: (4, 1),
}
_run_simulation(*args, **kwargs)
# To debug the tests pass vcd_name="sim.vcd" to the self.run_test call and use `gtkwave sim.gtkw` to view the trace
class TestPHYRateConverter(unittest.TestCase):
class Dut(Module):
def __init__(self, ratio, converter_kwargs=None, **dfi_kwargs):
self.ratio = ratio
self.dfi_old = DFIInterface(**dfi_kwargs)
converter_kwargs = converter_kwargs or {}
self.submodules.converter = DFIRateConverter(self.dfi_old, clkdiv="sys", clk=f"sys{ratio}x",
ratio=ratio, serdes_reset_cnt=-1, **converter_kwargs)
self.dfi = self.converter.dfi
def dfi_latency(self, ratio, reset_n=True):
latency_clkdiv = Serializer.LATENCY
latency_clk = ratio * latency_clkdiv
nop = {p: (dict(reset_n=0) if reset_n else {}) for p in range(4)} # reset_n will have wrong value until driven
return [nop] * latency_clk
def run_test(self, dut, dfi_sys, dfi_expected, dfi_input=None, **kwargs):
assert callable(dut), "dut must be a callable that returns new Dut instance"
dfi = DFISequencer(dfi_sys)
# Add GTKWave savefile for debugging if we are creating a VCD dumpfile (requires pyvcd installed)
if kwargs.get("vcd_name", False):
dumpfile = kwargs["vcd_name"]
savefile = os.path.splitext(dumpfile)[0] + ".gtkw"
# Create a separate dut just for the purpose of generaing a savefile
tmp_dut = dut()
vns = verilog.convert(tmp_dut).ns
with gtkw.GTKWSave(vns, savefile=savefile, dumpfile=dumpfile, prefix="") as save:
save.clocks()
for grp_dfi, grp_name in [(tmp_dut.dfi, "dfi new"), (tmp_dut.dfi_old, "dfi old")]:
with save.gtkw.group(grp_name):
# each phase in separate group
with save.gtkw.group("dfi phaseX", closed=True):
for i, phase in enumerate(grp_dfi.phases):
save.add(phase, group_name="dfi p{}".format(i), mappers=[
gtkw.dfi_sorter(phases=False),
gtkw.dfi_in_phase_colorer(),
])
# only dfi command signals
save.add(grp_dfi, group_name="dfi commands", mappers=[
gtkw.regex_filter(gtkw.suffixes2re(["cas_n", "ras_n", "we_n"])),
gtkw.dfi_sorter(),
gtkw.dfi_per_phase_colorer(),
])
# only dfi data signals
save.add(grp_dfi, group_name="dfi wrdata", mappers=[
gtkw.regex_filter(["wrdata$"]),
gtkw.dfi_sorter(),
gtkw.dfi_per_phase_colorer(),
])
save.add(grp_dfi, group_name="dfi wrdata_mask", mappers=[
gtkw.regex_filter(gtkw.suffixes2re(["wrdata_mask"])),
gtkw.dfi_sorter(),
gtkw.dfi_per_phase_colorer(),
])
save.add(grp_dfi, group_name="dfi rddata", mappers=[
gtkw.regex_filter(gtkw.suffixes2re(["rddata", "p0.*rddata_valid"])),
gtkw.dfi_sorter(),
gtkw.dfi_per_phase_colorer(),
])
def checker(dfi):
fail = False
history = defaultdict(list)
reference = defaultdict(list)
# first cycle has undefined data until DFISequencer drives the signals
yield
for i, dfi_phases in enumerate(dfi_expected):
for phase in range(len(dfi.phases)):
values = dfi_reset_values()
values.update(dfi_phases.get(phase, {}))
for name, ref in values.items():
# if name in ["rddata", "rddata_valid"]:
# continue
val = (yield getattr(dfi.phases[phase], name))
msg = f"Cycle {i}, dfi.p{phase}.{name} = {val} != {ref}"
history[name].append(val)
reference[name].append(ref)
if not fail and val != ref:
fail = (val, ref, msg)
yield
def split_cycles(hist):
s = ""
for i, val in enumerate(hist):
s += str(val)
if (i + 1) % len(dfi.phases) == 0:
s += " "
return s
if fail:
print()
for sig in history:
if len(getattr(dfi.phases[0], sig)) == 1:
print(f"{sig:12}: {split_cycles(history[sig])}")
print(" "*14 + f"{split_cycles(reference[sig])}")
self.assertEqual(*fail)
dut = dut()
run_simulation(dut.ratio, dut, generators={
"sys": [dfi.generator(dut.dfi), dfi.reader(dut.dfi)],
f"sys{dut.ratio}x": [checker(dut.dfi_old), DFISequencer.input_generator(dut.dfi_old, dfi_input or [])],
}, **kwargs)
dfi.assert_ok(self)
def test_dfi_rate_converter_phase_0(self):
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
dfi_sys = [
{0: read},
]
dfi_expected = [
*self.dfi_latency(ratio=2),
{0: read},
{},
]
self.run_test(lambda: self.Dut(
ratio=2,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=4,
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_2_cmd(self):
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
activate = dict(cs_n=0, cas_n=1, ras_n=0, we_n=1, bank=0b010, address=0b1110000111100001)
precharge = dict(cs_n=0, cas_n=1, ras_n=0, we_n=0, bank=0b111, address=0)
dfi_sys = [
{1: activate, 3: read, 6: precharge},
]
dfi_expected = [
*self.dfi_latency(ratio=2),
{1: activate, 3: read},
{2: precharge},
{}, {}, # 1
]
self.run_test(lambda: self.Dut(
ratio=2,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=4,
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_2_write(self):
write_ap = dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, bank=0b111, address=0b10000000000, wrdata_en=1)
data_clkdiv = {
0: dict(wrdata=0x1111, wrdata_mask=0b00),
1: dict(wrdata=0x2222, wrdata_mask=0b11),
2: dict(wrdata=0x3333, wrdata_mask=0b00),
3: dict(wrdata=0x4444, wrdata_mask=0b11),
4: dict(wrdata=0x5555, wrdata_mask=0b01),
5: dict(wrdata=0x6666, wrdata_mask=0b01),
6: dict(wrdata=0x7777, wrdata_mask=0b10),
7: dict(wrdata=0x8888, wrdata_mask=0b01),
}
data_clk = {
0: dict(wrdata=0x22221111, wrdata_mask=0b1100),
1: dict(wrdata=0x44443333, wrdata_mask=0b1100),
2: dict(wrdata=0x66665555, wrdata_mask=0b0101),
3: dict(wrdata=0x88887777, wrdata_mask=0b0110),
}
dfi_sys = [
{7: write_ap},
{},
data_clkdiv,
]
dfi_expected = [
*self.dfi_latency(ratio=2),
{}, # 0
{3: write_ap},
{}, # 1
{},
data_clk, # 2 (assuming write latency = 3)
{},
{}, # 3
{},
]
self.run_test(lambda: self.Dut(
ratio=2,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=4,
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_2_read(self):
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
data_clkdiv = {
0: dict(rddata=0x1111, rddata_valid=1),
1: dict(rddata=0x2222),
2: dict(rddata=0x3333),
3: dict(rddata=0x4444),
4: dict(rddata=0x5555),
5: dict(rddata=0x6666),
6: dict(rddata=0x7777),
7: dict(rddata=0x8888),
}
data_clk = {
0: dict(rddata=0x22221111, rddata_valid=1),
1: dict(rddata=0x44443333),
2: dict(rddata=0x66665555),
3: dict(rddata=0x88887777),
}
des_latency = [{}] * Deserializer.LATENCY
dfi_sys = [
{7: read}, # 0
{},
{}, # 2 (data_clk)
*des_latency,
data_clkdiv,
]
dfi_expected = [ # sys2x
*self.dfi_latency(ratio=2),
{}, # 0
{3: read},
]
dfi_input = [ # sys2x
*self.dfi_latency(ratio=2, reset_n=False),
{}, # 0
{}, # read
{}, # 1
{},
data_clk, # 2 (assumig read latency = 3)
]
self.run_test(lambda: self.Dut(
ratio=2,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=4,
), dfi_sys, dfi_expected, dfi_input=dfi_input)
def test_dfi_rate_converter_1_to_4_cmd(self):
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
activate = dict(cs_n=0, cas_n=1, ras_n=0, we_n=1, bank=0b010, address=0b1110000111100001)
precharge = dict(cs_n=0, cas_n=1, ras_n=0, we_n=0, bank=0b111, address=0)
dfi_sys = [
{1: activate, 3: read, 6: precharge},
]
dfi_expected = [
*self.dfi_latency(ratio=4),
{1: activate}, # 0
{1: read},
{},
{0: precharge},
{}, {}, {}, {}, # 1
]
self.run_test(lambda: self.Dut(
ratio=4,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=2,
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_4_write(self):
write_ap = dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, bank=0b111, address=0b10000000000, wrdata_en=1)
data_clkdiv = {
0: dict(wrdata=0x11),
1: dict(wrdata=0x22),
2: dict(wrdata=0x33),
3: dict(wrdata=0x44),
4: dict(wrdata=0x55),
5: dict(wrdata=0x66),
6: dict(wrdata=0x77),
7: dict(wrdata=0x88),
}
data_clk = {
0: dict(wrdata=0x44332211),
1: dict(wrdata=0x88776655),
}
dfi_sys = [
{7: write_ap},
{},
data_clkdiv,
]
dfi_expected = [
*self.dfi_latency(ratio=4),
{}, # 0
{},
{},
{1: write_ap},
{}, {}, {}, {}, # 1
data_clk, # 2 (assuming write latency = 5)
{}, {}, {},
{}, {}, {}, {}, # 3
]
self.run_test(lambda: self.Dut(
ratio=4,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=2,
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_4_read(self):
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
data_clkdiv = {
0: dict(rddata=0x1111, rddata_valid=1),
1: dict(rddata=0x2222, rddata_valid=1),
2: dict(rddata=0x3333, rddata_valid=1),
3: dict(rddata=0x4444, rddata_valid=1),
4: dict(rddata=0x5555, rddata_valid=1),
5: dict(rddata=0x6666, rddata_valid=1),
6: dict(rddata=0x7777, rddata_valid=1),
7: dict(rddata=0x8888, rddata_valid=1),
}
data_clk = {
0: dict(rddata=0x4444333322221111, rddata_valid=1),
1: dict(rddata=0x8888777766665555, rddata_valid=1),
}
des_latency = [{}] * Deserializer.LATENCY
dfi_sys = [
{7: read}, # 0
{},
{}, # 2 (data_clk)
*des_latency,
data_clkdiv,
]
dfi_expected = [ # sys2x
*self.dfi_latency(ratio=4),
{}, # 0
{},
{},
{1: read},
]
dfi_input = [ # sys2x
*self.dfi_latency(ratio=4, reset_n=False),
{}, # 0
{},
{},
{}, # read
{}, {}, {}, {}, # 1
data_clk, # 2 (assumig read latency = 5)
]
self.run_test(lambda: self.Dut(
ratio=4,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*32,
nphases=2,
), dfi_sys, dfi_expected, dfi_input=dfi_input)
def test_dfi_rate_converter_1_to_4_write_delayed(self):
# When write_latency does not aligh with clkdiv boundaries, the write data must be delayed
write_ap = dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, bank=0b111, address=0b10000000000, wrdata_en=1)
data_clkdiv = {
0: dict(wrdata=0x11),
1: dict(wrdata=0x22),
2: dict(wrdata=0x33),
3: dict(wrdata=0x44),
4: dict(wrdata=0x55),
5: dict(wrdata=0x66),
6: dict(wrdata=0x77),
7: dict(wrdata=0x88),
}
data_clk = {
0: dict(wrdata=0x44332211),
1: dict(wrdata=0x88776655),
}
for write_latency, sys_latency, write_delay in [(1, 0, 0), (2, 0, 1), (3, 0, 2), (4, 0, 3), (5, 1, 0)]:
with self.subTest(write_latency=write_latency, sys_latency=sys_latency, write_delay=write_delay):
sys_latency = [{}] * sys_latency
write_latency_cycles = [{}] * (write_latency - 1)
dfi_sys = [
{7: write_ap},
*sys_latency,
data_clkdiv, # send with sys write_latency=1
]
dfi_expected = [
*self.dfi_latency(ratio=4),
{}, # 0
{},
{},
{1: write_ap},
# 1
*write_latency_cycles,
data_clk,
{}, {}, {}, {},
]
self.run_test(lambda: self.Dut(
ratio=4,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*16,
nphases=2,
converter_kwargs=dict(write_delay=write_delay),
), dfi_sys, dfi_expected)
def test_dfi_rate_converter_1_to_4_read_delayed(self):
# When read_latency does not aligh with clkdiv boundaries, the read data must be delayed
read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b111, address=0b110101)
data_clkdiv = {
0: dict(rddata=0x1111, rddata_valid=1), # make sure it rddata_valid on 1 phase is replicated to ratio phases
1: dict(rddata=0x2222, rddata_valid=1),
2: dict(rddata=0x3333, rddata_valid=1),
3: dict(rddata=0x4444, rddata_valid=1),
4: dict(rddata=0x5555),
5: dict(rddata=0x6666),
6: dict(rddata=0x7777),
7: dict(rddata=0x8888),
}
data_clk = {
0: dict(rddata=0x4444333322221111, rddata_valid=1),
1: dict(rddata=0x8888777766665555),
}
for read_latency, sys_latency, read_delay in [(1, 0, 0), (2, 0, 1), (3, 0, 2), (4, 0, 3), (5, 1, 0)]:
# read_latency is the PHY's read latency
# sys_latency is additional latency added at sys clock
# read_delay is from which cycle at sys4x the data is taken
with self.subTest(read_latency=read_latency, sys_latency=sys_latency, read_delay=read_delay):
sys_latency = [{}] * (Deserializer.LATENCY + sys_latency)
read_latency_cycles = [{}] * (read_latency - 1)
dfi_sys = [
{7: read}, # 0
{}, # 1 (read command shows up on dfi_old)
*sys_latency,
data_clkdiv,
]
dfi_expected = [ # sys2x
*self.dfi_latency(ratio=4),
{}, # 0
{},
{},
{1: read},
]
dfi_input = [ # sys2x
*self.dfi_latency(ratio=4, reset_n=False),
{}, # 0
{},
{},
{}, # read
# 1
*read_latency_cycles,
data_clk,
]
self.run_test(lambda: self.Dut(
ratio=4,
addressbits=16,
bankbits=3,
nranks=1,
databits=2*32,
nphases=2,
converter_kwargs=dict(read_delay=read_delay),
), dfi_sys, dfi_expected, dfi_input=dfi_input)