70 lines
1.8 KiB
Python
70 lines
1.8 KiB
Python
|
import unittest
|
||
|
|
import random
|
||
|
|
|
||
|
|
from litex.gen import *
|
||
|
|
from litex.gen.genlib.misc import BitSlip
|
||
|
|
|
||
|
|
|
||
|
|
class BitSlipModel:
|
||
|
|
def __init__(self, data_width, latency):
|
||
|
|
self.data_width = data_width
|
||
|
|
self.latency = latency
|
||
|
|
|
||
|
|
def simulate(self, bitslip, sequence):
|
||
|
|
# prepare sequence for simulation
|
||
|
|
s = [0]*self.latency
|
||
|
|
for d in sequence:
|
||
|
|
s.append(d)
|
||
|
|
# simulate bitslip
|
||
|
|
r = []
|
||
|
|
for i in range(len(s)-1):
|
||
|
|
v = (s[i+1] << self.data_width) | s[i]
|
||
|
|
v = v >> bitslip
|
||
|
|
v &= 2**self.data_width-1
|
||
|
|
r.append(v)
|
||
|
|
return r
|
||
|
|
|
||
|
|
|
||
|
|
def main_generator(dut):
|
||
|
|
dut.o_sequence = []
|
||
|
|
yield dut.value.eq(dut.bitslip)
|
||
|
|
for i, data in enumerate(dut.i_sequence):
|
||
|
|
yield dut.i.eq(data)
|
||
|
|
dut.o_sequence.append((yield dut.o))
|
||
|
|
yield
|
||
|
|
|
||
|
|
|
||
|
|
class TestBitSlip(unittest.TestCase):
|
||
|
|
def bitslip_test(self, data_width, length=128):
|
||
|
|
prng = random.Random(42)
|
||
|
|
sequence = [prng.randrange(2**data_width) for i in range(length)]
|
||
|
|
|
||
|
|
for i in range(data_width):
|
||
|
|
dut = BitSlip(data_width)
|
||
|
|
dut.bitslip = i
|
||
|
|
dut.i_sequence = sequence
|
||
|
|
run_simulation(dut, main_generator(dut))
|
||
|
|
|
||
|
|
model = BitSlipModel(data_width, 4)
|
||
|
|
m_sequence = model.simulate(i, sequence)
|
||
|
|
|
||
|
|
self.assertEqual(dut.o_sequence, m_sequence[:len(dut.o_sequence)])
|
||
|
|
|
||
|
|
def test_bitslip_4b(self):
|
||
|
|
self.bitslip_test(4)
|
||
|
|
|
||
|
|
def test_bitslip_8b(self):
|
||
|
|
self.bitslip_test(8)
|
||
|
|
|
||
|
|
def test_bitslip_16b(self):
|
||
|
|
self.bitslip_test(16)
|
||
|
|
|
||
|
|
def test_bitslip_32b(self):
|
||
|
|
self.bitslip_test(32)
|
||
|
|
|
||
|
|
def test_bitslip_64b(self):
|
||
|
|
self.bitslip_test(64)
|
||
|
|
|
||
|
|
def test_bitslip_128b(self):
|
||
|
|
self.bitslip_test(128)
|