litex/migen/test/test_coding.py

83 lines
1.9 KiB
Python

import unittest
from migen.fhdl.std import *
from migen.genlib.coding import *
from migen.test.support import SimCase, SimBench
class EncCase(SimCase):
class TestBench(SimBench):
def __init__(self):
self.submodules.dut = Encoder(8)
def test_sizes(self):
self.assertEqual(flen(self.tb.dut.i), 8)
self.assertEqual(flen(self.tb.dut.o), 3)
self.assertEqual(flen(self.tb.dut.n), 1)
def test_run_sequence(self):
seq = list(range(1<<8))
cur = None
def cb(tb, s):
if seq:
s.wr(tb.dut.i, seq.pop(0))
i = s.rd(tb.dut.i)
if s.rd(tb.dut.n):
self.assertNotIn(i, [1<<i for i in range(8)])
else:
o = s.rd(tb.dut.o)
self.assertEqual(i, 1<<o)
self.run_with(cb, 256)
class PrioEncCase(SimCase):
class TestBench(SimBench):
def __init__(self):
self.submodules.dut = PriorityEncoder(8)
def test_sizes(self):
self.assertEqual(flen(self.tb.dut.i), 8)
self.assertEqual(flen(self.tb.dut.o), 3)
self.assertEqual(flen(self.tb.dut.n), 1)
def test_run_sequence(self):
seq = list(range(1<<8))
cur = None
def cb(tb, s):
if seq:
s.wr(tb.dut.i, seq.pop(0))
i = s.rd(tb.dut.i)
if s.rd(tb.dut.n):
self.assertEqual(i, 0)
else:
o = s.rd(tb.dut.o)
if o > 0:
self.assertEqual(i & 1<<(o - 1), 0)
self.assertGreaterEqual(i, 1<<o)
self.run_with(cb, 256)
class DecCase(SimCase):
class TestBench(SimBench):
def __init__(self):
self.submodules.dut = Decoder(8)
def test_sizes(self):
self.assertEqual(flen(self.tb.dut.i), 3)
self.assertEqual(flen(self.tb.dut.o), 8)
self.assertEqual(flen(self.tb.dut.n), 1)
def test_run_sequence(self):
seq = list(range(8*2))
cur = None
def cb(tb, s):
if seq:
i = seq.pop()
s.wr(tb.dut.i, i//2)
s.wr(tb.dut.n, i%2)
i = s.rd(tb.dut.i)
o = s.rd(tb.dut.o)
if s.rd(tb.dut.n):
self.assertEqual(o, 0)
else:
self.assertEqual(o, 1<<i)
self.run_with(cb, 256)