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44 lines
867 B
Python
44 lines
867 B
Python
from myhdl import Signal, delay, Simulation, always_comb, instance, intbv, bin, traceSignals
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def bin2gray(B, G, width):
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""" Gray encoder.
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B -- input intbv signal, binary encoded
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G -- output intbv signal, gray encoded
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width -- bit width
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"""
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@always_comb
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def logic():
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for i in range(width):
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G.next[i] = B[i+1] ^ B[i]
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return logic
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def testBench(width):
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B = Signal(intbv(0))
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G = Signal(intbv(0))
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dut = traceSignals(bin2gray, B, G, width)
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@instance
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def stimulus():
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for i in range(2**width):
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B.next = intbv(i)
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yield delay(10)
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print "B: " + bin(B, width) + "| G: " + bin(G, width)
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return dut, stimulus
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def main():
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sim = Simulation(testBench(width=3))
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sim.run()
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if __name__ == '__main__':
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main()
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