53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
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# SPDX-License-Identifier: AGPL-3.0-Only
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# Copyright (C) 2022 Sean Anderson <seanga2@gmail.com>
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import random
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import cocotb
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from cocotb.clock import Clock
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from cocotb.triggers import ClockCycles, Edge, FallingEdge, First, RisingEdge, Timer
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from cocotb.types import LogicArray
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@cocotb.test(timeout_time=50, timeout_unit='us')
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async def test_io(io):
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io.mdc.value = 0
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io.mdo_valid.value = 0
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await Timer(1)
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await cocotb.start(Clock(io.clk, 8, units='ns').start())
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# random phase
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await Timer(random.randrange(1, 9), units='ns')
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await cocotb.start(Clock(io.mdc, 400, units='ns').start())
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ins = [random.randrange(2) for _ in range(10)]
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await FallingEdge(io.mdc)
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async def send_ins():
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for bit in ins:
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await Timer(190, 'ns')
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io.mdio.value = bit
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await Timer(20, 'ns')
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io.mdio.value = LogicArray('X')
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await FallingEdge(io.mdc)
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await cocotb.start(send_ins())
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for bit in ins:
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while not io.ce.value:
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await RisingEdge(io.clk)
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assert io.mdi.value == bit
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await FallingEdge(io.clk)
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outs = [random.randrange(2) for _ in range(10)]
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io.mdio.value = LogicArray('Z')
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await FallingEdge(io.clk)
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for bit in outs:
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io.mdo.value = bit
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io.mdo_valid.value = 1
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await FallingEdge(io.clk)
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assert io.mdio_oe.value
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await FallingEdge(io.clk)
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await FallingEdge(io.clk)
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assert io.mdio.value == bit
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io.mdo_valid.value = 0
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await FallingEdge(io.clk)
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assert io.mdio.value.binstr == 'z'
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