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test/test_refresh: add RefreshTimer test

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This commit is contained in:
Florent Kermarrec 2019-07-23 21:42:21 +02:00
parent 9584c2fe88
commit b4125fa50f
1 changed files with 26 additions and 1 deletions
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27
test/test_refresh.py
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@ -6,7 +6,7 @@ import unittest
from migen import * from migen import *
from litedram.core.multiplexer import cmd_request_rw_layout from litedram.core.multiplexer import cmd_request_rw_layout
from litedram.core.refresher import RefreshGenerator from litedram.core.refresher import RefreshGenerator, RefreshTimer
def c2bool(c): def c2bool(c):
@ -40,3 +40,28 @@ class TestRefresh(unittest.TestCase):
cmds.ras = "___--___________" cmds.ras = "___--___________"
dones = "______-_________" dones = "______-_________"
self.refresh_generator_test(trp, trfc, starts, dones, cmds) self.refresh_generator_test(trp, trfc, starts, dones, cmds)
def refresh_timer_test(self, trefi):
def generator(dut):
dut.errors = 0
for i in range(16*(trefi + 1)):
yield
if i%(trefi + 1) == (trefi - 1):
if (yield dut.refresh.done) != 1:
dut.errors += 1
else:
if (yield dut.refresh.done) != 0:
dut.errors += 1
class DUT(Module):
def __init__(self, trefi):
self.submodules.refresh = RefreshTimer(trefi)
self.comb += self.refresh.wait.eq(~self.refresh.done)
dut = DUT(trefi)
run_simulation(dut, [generator(dut)])
self.assertEqual(dut.errors, 0)
def test_refresh_timer(self):
for i in range(1, 32):
self.refresh_timer_test(i)