44 lines
1.1 KiB
Python
44 lines
1.1 KiB
Python
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# SPDX-License-Identifier: AGPL-3.0-Only
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# Copyright (C) 2023 Sean Anderson <seanga2@gmail.com>
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import cocotb
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from cocotb.binary import BinaryValue
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from cocotb.clock import Clock
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from cocotb.triggers import ClockCycles, FallingEdge, Timer
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from .util import BIT
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@cocotb.test(timeout_time=1, timeout_unit='us')
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async def test_elastic(led):
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led.clk.value = BinaryValue('Z')
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led.triggers.value = 0
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led.test_mode.value = 1
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await Timer(1)
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await cocotb.start(Clock(led.clk, 2, units='ns').start())
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await FallingEdge(led.clk)
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assert not led.out.value
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led.triggers.value = 1
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await FallingEdge(led.clk)
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assert not led.out.value
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led.triggers.value = 0
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while not led.out.value:
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await FallingEdge(led.clk)
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assert led.out.value == 1
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led.triggers.value = 1
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await FallingEdge(led.clk)
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led.triggers.value = 0
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await ClockCycles(led.clk, 16, False)
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led.triggers.value = 2
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await FallingEdge(led.clk)
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assert not led.out.value
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while not led.out.value:
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await FallingEdge(led.clk)
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assert led.out.value == 2
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