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69 lines
1.8 KiB
Python
69 lines
1.8 KiB
Python
import unittest
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from unittest import TestCase
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from myhdl import Signal, intbv, delay, Simulation
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from arith_utils import BEHAVIOR, STRUCTURE
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from arith_utils import SLOW, FAST
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from LeadZeroDet import LeadZeroDet
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import random
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random.seed = 1
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from random import random
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class LeadZeroDetTest(TestCase):
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""" Leading zeroes detector unit test class """
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def bench(self, width, speed, nrsamples=0):
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""" Leading zeroes detector test bench
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width -- decrementer bit width
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speed -- SLOW, MEDIUM or FAST
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nrsamples -- required number of random samples, or exhaustive
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test if not set (default)
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"""
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A = Signal(intbv(0))
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ZS = Signal(intbv(0))
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ZB = Signal(intbv(0))
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beh = LeadZeroDet(width, speed, A, ZB, architecture=BEHAVIOR)
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str = LeadZeroDet(width, speed, A, ZS, architecture=STRUCTURE)
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def stimulus():
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if nrsamples:
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vals = [long(random()*(2**width)) for i in range(nrsamples)]
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else:
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vals = range(2**width)
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for i in vals:
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A.next = intbv(i)
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yield delay(10)
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self.assertEqual(ZS, ZB)
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return (beh, str, stimulus())
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def testLeadZeroDetSmallSlow(self):
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Simulation(self.bench(width=8, speed=SLOW)).run()
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def testLeadZeroDetLargeSlow(self):
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Simulation(self.bench(width=39, speed=SLOW, nrsamples=16)).run()
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def testLeadZeroDetSmallFast(self):
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Simulation(self.bench(width=8, speed=FAST)).run()
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def testLeadZeroDetLargeFast(self):
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Simulation(self.bench(width=39, speed=FAST, nrsamples=16)).run()
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if __name__ == "__main__":
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unittest.main()
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