def test_counter():
"""Simple testbench for the Counter above."""
# Create a counter with a rollover at 18.
# This awkward non-power-of-two value will help test that we're not
# rolling over by accident of the bit width of the counter.
counter = Counter(limit=18)
# Test benches are written as Python generators, which yield
# commands to the simulator such as "send me the current value of this
# signal" or "advance the simulation by one clock cycle".
def testbench():
for step in range(20):
# Check outputs are correct at each step.
assert (yield counter.counter) == (step % 18)
if step == 17:
assert (yield counter.rollover)
else:
assert not (yield counter.rollover)
# Advance simulation by one cycle.
yield
sim = Simulator(counter)
# To test synchronous processes, we create a clock at some nominal
# frequency (which only changes the displayed timescale in the output),
# and add our testbench as a "synchronous" process.
sim.add_clock(1 / 10e6)
sim.add_sync_process(testbench)
sim.run()
def test_comb_alu():
alu = ALU()
def testbench():
for a in range(20):
yield alu.a.eq(a)
for b in range(20):
yield alu.b.eq(b)
# In this combinatorial testbench, we use `yield Settle()`
# to request the simulator advance until all combinatorial
# statements have been fully resolved.
yield alu.op.eq(1)
yield Settle()
assert (yield alu.y) == a + b
yield alu.op.eq(0)
yield Settle()
assert (yield alu.y) == (a - b) % 512
sim = Simulator(alu)
# Instead of `sim.add_sync_process`, which would try to use a clock domain
# (by default, "sync") and error out saying it doesn't exist, we use
# `sim.add_process`.
sim.add_process(testbench)
sim.run()
class TestBase(unittest.TestCase):
"""Base class for testing an Amaranth module.
The module can use sync, comb or both.
"""
def setUp(self):
# Ensure IS_SIM_RUN set
global _IS_SIM_RUN
_IS_SIM_RUN = True
# Create DUT and add to simulator
self.m = Module()
self.dut = self.create_dut()
self.m.submodules['dut'] = self.dut
self.m.submodules['dummy'] = _DummySyncModule()
self.sim = Simulator(self.m)
def create_dut(self):
"""Returns an instance of the device under test"""
raise NotImplementedError
def add_process(self, process):
"""Add main test process to the simulator"""
self.sim.add_sync_process(process)
def add_sim_clocks(self):
"""Add clocks as required by sim.
"""
self.sim.add_clock(1, domain='sync')
def run_sim(self, process, write_trace=False):
self.add_process(process)
self.add_sim_clocks()
if write_trace:
with self.sim.write_vcd("zz.vcd", "zz.gtkw"):
self.sim.run()
# Discourage commiting code with tracing active
self.fail("Simulation tracing active. "
"Turn off after debugging complete.")
else:
self.sim.run()
def basic_vm_test():
cpu = MtkCpu(
mem_config=EBRMemConfig(
mem_size_words=0x123,
mem_content_words=None, # Optional[List[int]]
mem_addr=CODE_START_ADDR,
simulate=True,
)
)
def wait_decode() -> int: # returns pc of instr being decoded
while True:
is_decode = yield cpu.fetch
if is_decode:
return (yield cpu.pc)
yield
def wait_pc(target_pc : int, instr_limit: Optional[int]=None):
import logging
logging.info(f"== waiting for pc {target_pc}")
miss = 0
while True:
pc = wait_decode()
logging.info(f"pc: {pc}")
if pc == target_pc:
logging(f"pc {target_pc} found")
else:
miss += 1
if miss == instr_limit:
raise ValueError(f"limit of {instr_limit} instructions exceeded while waiting for {target_pc}")
# TODO test is not finished.
def main():
yield cpu.current_priv_mode.eq(PrivModeBits.USER)
yield cpu.csr_unit.satp.eq(0x8000_0123)
res = []
for _ in range (30):
priv = yield cpu.current_priv_mode
priv = yield cpu.arbiter.addr_translation_en
priv = yield cpu.csr_unit.satp.mode
priv = yield cpu.pc
res.append(hex(priv))
yield
raise ValueError(res)
sim = Simulator(cpu)
sim.add_clock(1e-6)
sim.add_sync_process(main)
from mtkcpu.utils.tests.sim_tests import get_state_name, find_fsm
# fsm = find_fsm(cpu.arbiter, "fsm")
# main_fsm = find_fsm(cpu, "fsm")
# raise ValueError(fsm)
traces = [
sim._fragment.domains["sync"].clk,
cpu.pc,
cpu.arbiter.addr_translation_en,
cpu.arbiter.translation_ack,
cpu.arbiter.start_translation,
# fsm.state,
cpu.arbiter.pe.i,
cpu.arbiter.pe.o,
cpu.arbiter.pe.none,
cpu.csr_unit.satp.mode,
cpu.csr_unit.satp.ppn,
cpu.arbiter.first,
cpu.arbiter.error_code,
# main_fsm.state
]
with sim.write_vcd(f"vm.vcd", "vm.gtkw", traces=traces):
sim.run()
def reg_test(
name: str,
timeout_cycles: Optional[int],
reg_num: int,
expected_val: Optional[int],
expected_mem: Optional[MemoryContents],
reg_init: RegistryContents,
mem_cfg: EBRMemConfig,
verbose: bool = False,
):
cpu = MtkCpu(
reg_init=reg_init.reg,
with_debug=False, # XXX
mem_config=mem_cfg
)
sim = Simulator(cpu)
sim.add_clock(1e-6)
assert (reg_num is None and expected_val is None) or (
reg_num is not None and expected_val is not None
)
# Since Amaranth HDL's 'Memory' instance simulation in included,
# we don't need to use custom implementation (however some coverage drop
# is present - 'Memory' class is assumed single-cycle-access, while
# 'get_sim_memory_test' processing delay is random).
# sim.add_sync_process(get_sim_memory_test(cpu=cpu, mem_dict=mem_dict))
# instead only collect write transactions directly on a bus.
result_mem = {}
sim.add_sync_process(capture_write_transactions(cpu=cpu, dict_reference=result_mem))
sim.add_sync_process(
get_sim_register_test(
name=name,
cpu=cpu,
reg_num=reg_num,
expected_val=expected_val,
timeout_cycles=timeout_cycles,
)
)
csr_unit : CsrUnit = cpu.csr_unit
# frag = Fragment.get(cpu, platform=None)
# main_fsm = frag.find_generated("fsm")
e = cpu.exception_unit
sim_traces = [
# main_fsm.state,
# e.m_instruction,
# e.mtval.value,
# csr_unit.mtvec.base,
# csr_unit.mtvec.mode,
# *csr_unit.mepc.fields.values(),
*csr_unit.mcause.fields.values(),
*csr_unit.satp.fields.values(),
# *csr_unit.mie.fields.values(),
# *csr_unit.mstatus.fields.values(),
# *csr_unit.mtime.fields.values(),
# *csr_unit.mtimecmp.fields.values(),
cpu.instr,
cpu.pc,
# csr_unit.rs1,
# csr_unit.csr_idx,
# csr_unit.rd,
# csr_unit.rd_val,
# csr_unit.vld,
# csr_unit.ONREAD,
# csr_unit.ONWRITE,
cpu.arbiter.pe.i,
cpu.arbiter.pe.o,
cpu.arbiter.pe.none,
cpu.arbiter.bus_free_to_latch,
cpu.arbiter.error_code,
cpu.arbiter.addr_translation_en,
cpu.arbiter.translation_ack,
cpu.arbiter.start_translation,
cpu.arbiter.phys_addr,
cpu.arbiter.root_ppn,
*cpu.arbiter.pte.fields.values(),
cpu.arbiter.generic_bus.addr,
cpu.arbiter.generic_bus.read_data,
cpu.arbiter.vpn,
]
# from amaranth.back import verilog
# s = verilog.convert(cpu)
# open("cpu.v", "w").write(s)
with sim.write_vcd("cpu.vcd", "cpu.gtkw", traces=sim_traces):
sim.run()
if expected_mem is not None:
MemoryContents(result_mem).assert_equality(expected_mem)
def unit_testbench(case: ComponentTestbenchCase):
if case.component_type == MemoryArbiter:
m, f = memory_arbiter_tb()
elif case.component_type == GPIO_Wishbone:
m, f = gpio_tb()
else:
print(f"===== Skipping not covered type {case.component_type}")
return
sim = Simulator(m)
sim.add_clock(1e-6)
sim.add_sync_process(f)
with sim.write_vcd(f"{case.name}.vcd"):
sim.run()
# returns ELF path
def compile_sw_project(proj_name : str) -> Path:
sw_dir = Path(__file__).parent.parent.parent / "sw"
proj_dir = sw_dir / proj_name
if not proj_dir.exists() or not proj_dir.is_dir():
raise ValueError(f"Compilation failed: Directory {proj_dir} does not exists!")
from mtkcpu.utils.linker import write_linker_script
write_linker_script(sw_dir / "common" / "linker.ld", CODE_START_ADDR)
process = subprocess.Popen(f"make -B", cwd=proj_dir, shell=True)
process.communicate()
if process.returncode:
raise ValueError(f"Compilation failed! {proj_name} (inside {proj_dir})")
elf_path = proj_dir / "build" / f"{proj_name}.elf"
def test_with_samplerate(samplerate: int=48000):
"""run adat signal simulation with the given samplerate"""
# 24 bit plus the 6 nibble separator bits for eight channel
# then 1 separator, 10 sync bits (zero), 1 separator and 4 user bits
clk_freq = 100e6
dut = ADATReceiverTester(clk_freq)
adat_freq = NRZIDecoder.adat_freq(samplerate)
clockratio = clk_freq / adat_freq
sim = Simulator(dut)
sim.add_clock(1.0/clk_freq, domain="sync")
sim.add_clock(1.0/adat_freq, domain="adat")
sixteen_adat_frames = sixteen_frames_with_channel_num_msb_and_sample_num()
testdata = \
one_empty_adat_frame() + \
sixteen_adat_frames[0:256] + \
[0] * 64 + \
sixteen_adat_frames[256:]
testdata_nrzi = encode_nrzi(testdata)
print(f"FPGA clock freq: {clk_freq}")
print(f"ADAT clock freq: {adat_freq}")
print(f"FPGA/ADAT freq: {clockratio}")
no_cycles = len(testdata_nrzi) + 500
# Send the adat stream
def adat_process():
for bit in testdata_nrzi: # [224:512 * 2]:
yield dut.adat_in.eq(bit)
yield Tick("adat")
# Process the adat stream and validate output
def sync_process():
# Obtain the output data
out_data = [[0 for x in range(9)] for y in range(16)] #store userdata in the 9th column
sample = 0
for _ in range(int(clockratio) * no_cycles):
yield Tick("sync")
if (yield dut.output_enable == 1):
channel = yield dut.addr_out
out_data[sample][channel] = yield dut.sample_out
if (channel == 7):
out_data[sample][8] = yield dut.user_data_out
sample += 1
#print(out_data)
#
# The receiver needs 2 sync pads before it starts outputting data:
# * The first sync pad is needed for the nrzidecoder to sync
# * The second sync pad is needed for the receiver to sync
# Therefore each time after the connection was lost the first frame will be lost while syncing.
# In our testdata we loose the initial one_empty_adat_frame and the second sample (#1, count starts with 0)
#
sampleno = 0
for i in range(16):
if (sampleno == 1): #skip the first frame while the receiver syncs after an interruption
sampleno += 1
elif (sampleno == 16): #ensure the data ended as expected
assert out_data[i] == [0, 0, 0, 0, 0, 0, 0, 0, 0], "Sample {} was: {}".format(sampleno, print_frame(out_data[sampleno]))
else:
assert out_data[i] == [((0 << 20) | sampleno), ((1 << 20) | sampleno), ((2 << 20) | sampleno),
((3 << 20) | sampleno), ((4 << 20) | sampleno), ((5 << 20) | sampleno),
((6 << 20) | sampleno), ((7 << 20) | sampleno), 0b0101]\
, "Sample #{} was: {}".format(sampleno, print_frame(out_data[sampleno]))
sampleno += 1
print("Success!")
sim.add_sync_process(sync_process, domain="sync")
sim.add_sync_process(adat_process, domain="adat")
with sim.write_vcd(f'receiver-smoke-test-{str(samplerate)}.vcd'):
sim.run()
class LunaGatewareTestCase(unittest.TestCase):
domain = 'sync'
# Convenience property: if set, instantiate_dut will automatically create
# the relevant fragment with FRAGMENT_ARGUMENTS.
FRAGMENT_UNDER_TEST = None
FRAGMENT_ARGUMENTS = {}
# Convenience properties: if not None, a clock with the relevant frequency
# will automatically be added.
FAST_CLOCK_FREQUENCY = None
SYNC_CLOCK_FREQUENCY = 120e6
USB_CLOCK_FREQUENCY = None
SS_CLOCK_FREQUENCY = None
def instantiate_dut(self):
""" Basic-most function to instantiate a device-under-test.
By default, instantiates FRAGMENT_UNDER_TEST.
"""
return self.FRAGMENT_UNDER_TEST(**self.FRAGMENT_ARGUMENTS)
def get_vcd_name(self):
""" Return the name to use for any VCDs generated by this class. """
return "test_{}".format(self.__class__.__name__)
def setUp(self):
self.dut = self.instantiate_dut()
self.sim = Simulator(self.dut)
if self.USB_CLOCK_FREQUENCY:
self.sim.add_clock(1 / self.USB_CLOCK_FREQUENCY, domain="usb")
if self.SYNC_CLOCK_FREQUENCY:
self.sim.add_clock(1 / self.SYNC_CLOCK_FREQUENCY, domain="sync")
if self.FAST_CLOCK_FREQUENCY:
self.sim.add_clock(1 / self.FAST_CLOCK_FREQUENCY, domain="fast")
if self.SS_CLOCK_FREQUENCY:
self.sim.add_clock(1 / self.SS_CLOCK_FREQUENCY, domain="ss")
def initialize_signals(self):
""" Provide an opportunity for the test apparatus to initialize siganls. """
yield Signal()
def traces_of_interest(self):
""" Returns an interable of traces to include in any generated output. """
return ()
def simulate(self, *, vcd_suffix=None):
""" Runs our core simulation. """
# If we're generating VCDs, run the test under a VCD writer.
if os.getenv('GENERATE_VCDS', default=False):
# Figure out the name of our VCD files...
vcd_name = self.get_vcd_name()
if vcd_suffix:
vcd_name = "{}_{}".format(vcd_name, vcd_suffix)
# ... and run the simulation while writing them.
traces = self.traces_of_interest()
with self.sim.write_vcd(vcd_name + ".vcd",
vcd_name + ".gtkw",
traces=traces):
self.sim.run()
else:
self.sim.run()
@staticmethod
def pulse(signal, *, step_after=True):
""" Helper method that asserts a signal for a cycle. """
yield signal.eq(1)
yield
yield signal.eq(0)
if step_after:
yield
@staticmethod
def advance_cycles(cycles):
""" Helper methods that waits for a given number of cycles. """
for _ in range(cycles):
yield
@staticmethod
def wait_until(strobe, *, timeout=None):
""" Helper method that advances time until a strobe signal becomes true. """
cycles_passed = 0
while not (yield strobe):
yield
cycles_passed += 1
if timeout and cycles_passed > timeout:
raise RuntimeError(
f"Timeout waiting for '{strobe.name}' to go high!")
def _ensure_clocks_present(self):
""" Function that validates that a clock is present for our simulation domain. """
frequencies = {
'sync': self.SYNC_CLOCK_FREQUENCY,
'usb': self.USB_CLOCK_FREQUENCY,
'fast': self.FAST_CLOCK_FREQUENCY,
'ss': self.SS_CLOCK_FREQUENCY
}
self.assertIsNotNone(
frequencies[self.domain],
f"no frequency provied for `{self.domain}`-domain clock!")
def wait(self, time):
""" Helper method that waits for a given number of seconds in a *_test_case. """
# Figure out the period of the clock we want to work with...
if self.domain == 'sync':
period = 1 / self.SYNC_CLOCK_FREQUENCY
elif self.domain == 'usb':
period = 1 / self.USB_CLOCK_FREQUENCY
elif self.domain == 'fast':
period = 1 / self.FAST_CLOCK_FREQUENCY
# ... and, accordingly, how many cycles we want to delay.
cycles = math.ceil(time / period)
print(cycles)
# Finally, wait that many cycles.
yield from self.advance_cycles(cycles)
def test_with_samplerate(samplerate: int = 48000):
clk_freq = 50e6
dut = ADATTransmitter()
adat_freq = NRZIDecoder.adat_freq(samplerate)
clockratio = clk_freq / adat_freq
print(f"FPGA clock freq: {clk_freq}")
print(f"ADAT clock freq: {adat_freq}")
print(f"FPGA/ADAT freq: {clockratio}")
sim = Simulator(dut)
sim.add_clock(1.0 / clk_freq, domain="sync")
sim.add_clock(1.0 / adat_freq, domain="adat")
def write(addr: int,
sample: int,
last: bool = False,
drop_valid: bool = False):
while (yield dut.ready_out == 0):
yield from wait(1)
if last:
yield dut.last_in.eq(1)
yield dut.addr_in.eq(addr)
yield dut.sample_in.eq(sample)
yield dut.valid_in.eq(1)
yield Tick("sync")
if drop_valid:
yield dut.valid_in.eq(0)
if last:
yield dut.last_in.eq(0)
def wait(n_cycles: int):
for _ in range(int(clockratio) * n_cycles):
yield Tick("sync")
def sync_process():
yield Tick("sync")
yield Tick("sync")
yield dut.user_data_in.eq(0xf)
for i in range(4):
yield from write(i, i, drop_valid=True)
for i in range(4):
yield from write(4 + i, 0xc + i, i == 3, drop_valid=True)
yield dut.user_data_in.eq(0xa)
yield Tick("sync")
for i in range(8):
yield from write(i, (i + 1) << 4, i == 7)
yield dut.user_data_in.eq(0xb)
yield Tick("sync")
for i in range(8):
yield from write(i, (i + 1) << 8, i == 7)
yield dut.user_data_in.eq(0xc)
yield Tick("sync")
for i in range(8):
yield from write(i, (i + 1) << 12, i == 7)
yield dut.user_data_in.eq(0xd)
yield Tick("sync")
for i in range(8):
yield from write(i, (i + 1) << 16, i == 7)
yield dut.user_data_in.eq(0xe)
yield Tick("sync")
for i in range(8):
yield from write(i, (i + 1) << 20, i == 7, drop_valid=True)
yield from wait(900)
def adat_process():
nrzi = []
i = 0
while i < 1800:
yield Tick("adat")
out = yield dut.adat_out
nrzi.append(out)
i += 1
# skip initial zeros
nrzi = nrzi[nrzi.index(1):]
signal = decode_nrzi(nrzi)
decoded = adat_decode(signal)
print(decoded)
user_bits = [decoded[frame][0] for frame in range(7)]
assert user_bits == [0x0, 0xf, 0xa, 0xb, 0xc, 0xd,
0xe], print_assert_failure(user_bits)
assert decoded[0][1:] == [0, 0, 0, 0, 0, 0, 0,
0], print_assert_failure(decoded[0][1:])
assert decoded[1][1:] == [0, 1, 2, 3, 0xc, 0xd, 0xe,
0xf], print_assert_failure(decoded[1][1:])
assert decoded[2][1:] == [
0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80
], print_assert_failure(decoded[2][1:])
assert decoded[3][1:] == [
0x100, 0x200, 0x300, 0x400, 0x500, 0x600, 0x700, 0x800
], print_assert_failure(decoded[3][1:])
assert decoded[4][1:] == [
0x1000, 0x2000, 0x3000, 0x4000, 0x5000, 0x6000, 0x7000, 0x8000
], print_assert_failure(decoded[4][1:])
assert decoded[5][1:] == [
0x10000, 0x20000, 0x30000, 0x40000, 0x50000, 0x60000, 0x70000,
0x80000
], print_assert_failure(decoded[5][1:])
sim.add_sync_process(sync_process, domain="sync")
sim.add_sync_process(adat_process, domain="adat")
with sim.write_vcd(f'transmitter-smoke-test-{str(samplerate)}.vcd'):
sim.run()
def test_riscv_dv(cfg: RiscvDvTestConfig):
sys.setrecursionlimit(10**6) # otherwise amaranth/sim/_pyrtl.py:441: RecursionError, because of huge memory size
max_code_size = cfg.test_elf.stat().st_size
program = read_elf(cfg.test_elf)
mem_cfg = EBRMemConfig.from_mem_dict(
start_addr=cfg.start_addr,
num_bytes=max_code_size,
simulate=True,
mem_dict=MemoryContents(program),
)
cpu = MtkCpu(
with_debug=False,
mem_config=mem_cfg
)
sim = Simulator(cpu)
sim.add_clock(1e-6)
traces = [
cpu.pc,
cpu.instr,
cpu.rd,
cpu.should_write_rd,
*cpu.csr_unit.satp.fields.values(),
cpu.exception_unit.current_priv_mode,
cpu.arbiter.pe.i,
cpu.arbiter.pe.o,
cpu.arbiter.pe.none,
cpu.arbiter.bus_free_to_latch,
cpu.arbiter.error_code,
cpu.arbiter.addr_translation_en,
cpu.arbiter.translation_ack,
cpu.arbiter.start_translation,
cpu.arbiter.phys_addr,
cpu.arbiter.root_ppn,
*cpu.arbiter.pte.fields.values(),
cpu.arbiter.generic_bus.addr,
cpu.arbiter.generic_bus.read_data,
cpu.arbiter.vpn,
cpu.arbiter.error_code,
]
csv_output = tempfile.NamedTemporaryFile(
suffix=f".mtkcpu.{cfg.test_name}.csv",
dir=Path(__file__).parent.name,
delete=False
)
fn = riscv_dv_sim_process(
cpu=cpu,
iss_csv=cfg.iss_csv,
compare_every=cfg.compare_every,
csv_output=Path(csv_output.name),
)
sim.add_sync_process(fn)
with sim.write_vcd("cpu.vcd", "cpu.gtkw", traces=traces):
sim.run()
print("== Waveform dumped to cpu.vcd file")
def test_with_samplerate(samplerate: int=48000):
"""run adat signal simulation with the given samplerate"""
# 24 bit plus the 6 nibble separator bits for eight channel
# then 1 separator, 10 sync bits (zero), 1 separator and 4 user bits
clk_freq = 100e6
dut = NRZIDecoderTester(clk_freq)
adat_freq = NRZIDecoder.adat_freq(samplerate)
clockratio = clk_freq / adat_freq
sim = Simulator(dut)
sim.add_clock(1.0/clk_freq, domain="sync")
sim.add_clock(1.0/adat_freq, domain="adat")
print(f"FPGA clock freq: {clk_freq}")
print(f"ADAT clock freq: {adat_freq}")
print(f"FPGA/ADAT freq: {clockratio}")
sixteen_adat_frames = sixteen_frames_with_channel_num_msb_and_sample_num()
interrupted_adat_stream = [0] * 64
testdata = one_empty_adat_frame() + \
sixteen_adat_frames[0:256] + \
interrupted_adat_stream + \
sixteen_adat_frames[256:]
testdata_nrzi = encode_nrzi(testdata)
no_cycles = len(testdata_nrzi)
# Send the adat stream
def adat_process():
bitcount :int = 0
for bit in testdata_nrzi: #[224:512 * 2]:
if (bitcount == 4 * 256 + 64):
yield dut.invalid_frame_in.eq(1)
yield Tick("adat")
yield dut.invalid_frame_in.eq(0)
for _ in range(20):
yield Tick("adat")
else:
yield dut.invalid_frame_in.eq(0)
yield dut.nrzi_in.eq(bit)
yield Tick("adat")
bitcount += 1
# Process the adat stream and validate output
def sync_process():
# Obtain the output data
out_data = []
for _ in range(int(clockratio) * no_cycles):
yield Tick("sync")
if (yield dut.data_out_en == 1):
bit = yield dut.data_out
yield out_data.append(bit)
#
# Validate output
#
# omit a 1 at the end of the sync pad
out_data = out_data[1:]
# Whenever the state machine switches from SYNC to DECODE we need to omit the first 11 sync bits
validate_output(out_data[:256 - 12], one_empty_adat_frame()[12:256])
out_data = out_data[256-12:]
validate_output(out_data[:256], sixteen_adat_frames[:256])
out_data = out_data[256:]
# now the adat stream was interrupted, it continues to output zeroes, until it enters the SYNC state
validate_output(out_data[:10], interrupted_adat_stream[:10])
out_data = out_data[10:]
# followed by 2 well formed adat frames
# omit the first 11 sync bits
validate_output(out_data[:256 - 12], sixteen_adat_frames[256 + 12:2 * 256])
out_data = out_data[256 - 12:]
validate_output(out_data[:256], sixteen_adat_frames[2 * 256:3 * 256])
out_data = out_data[256:]
# followed by one invalid frame - the state machine SYNCs again
# followed by 13 well-formed frames
# omit the first 11 sync bits
validate_output(out_data[:256 - 12], sixteen_adat_frames[3 * 256 + 12:4 * 256])
out_data = out_data[256-12:]
for i in range(4, 16):
validate_output(out_data[:256], sixteen_adat_frames[i * 256:(i + 1) * 256])
out_data = out_data[256:]
print("Success!")
sim.add_sync_process(sync_process, domain="sync")
sim.add_sync_process(adat_process, domain="adat")
with sim.write_vcd(f'nrzi-decoder-bench-{str(samplerate)}.vcd'):
sim.run()
