89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# 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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from .util import ClockEnable
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@cocotb.test(timeout_time=500, timeout_unit='ns')
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async def test_io(io):
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io.isolate.value = 0
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io.ce.value = 0
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io.valid.value = LogicArray('X')
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io.err.value = LogicArray('X')
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io.data.value = LogicArray('X' * 4)
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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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await ClockCycles(io.clk, 1)
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async def clock_monitor():
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await FallingEdge(io.rx_clk)
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fall = cocotb.utils.get_sim_time('ns')
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while True:
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await RisingEdge(io.rx_clk)
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rise = cocotb.utils.get_sim_time('ns')
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assert round(rise - fall) == 20
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await FallingEdge(io.rx_clk)
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fall = cocotb.utils.get_sim_time('ns')
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high = round(fall - rise)
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assert high >= 12 and high <= 28
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await cocotb.start(clock_monitor())
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async def send_datum(valid, err, data, delay, early=True):
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if early:
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await Timer(1)
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io.valid.value = valid
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io.err.value = err
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io.data.value = data
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io.ce.value = 1
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await ClockCycles(io.clk, 2 if early else 1, False)
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io.ce.value = 0
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io.valid.value = LogicArray('X')
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io.err.value = LogicArray('X')
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io.data.value = LogicArray('X' * 4)
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await ClockCycles(io.clk, delay - 1, early)
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async def send_data():
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await send_datum(1, 0, 1, 5, True)
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await send_datum(0, 1, 2, 4, True)
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await send_datum(1, 0, 3, 5, True)
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await send_datum(0, 1, 4, 6, True)
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await send_datum(1, 0, 5, 5, True)
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await FallingEdge(io.clk)
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await send_datum(0, 1, 6, 5, False)
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await send_datum(1, 0, 7, 4, False)
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await send_datum(0, 1, 8, 5, False)
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await send_datum(1, 0, 9, 6, False)
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await send_datum(0, 1, 10, 5, False)
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await cocotb.start(send_data())
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async def recv_datum(valid, err, data):
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await RisingEdge(io.rx_clk)
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assert io.rx_dv.value == valid
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assert io.rx_er.value == err
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assert io.rxd.value == data
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await RisingEdge(io.rx_clk)
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await recv_datum(1, 0, 1)
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await recv_datum(0, 1, 2)
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await recv_datum(1, 0, 3)
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await recv_datum(0, 1, 4)
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await recv_datum(1, 0, 5)
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await recv_datum(0, 1, 6)
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await recv_datum(1, 0, 7)
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await recv_datum(0, 1, 8)
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await recv_datum(1, 0, 9)
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await recv_datum(0, 1, 10)
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io.isolate.value = 1
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await FallingEdge(io.clk)
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assert io.rx_clk.value.binstr == 'z'
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assert io.rx_dv.value.binstr == 'z'
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assert io.rx_er.value.binstr == 'z'
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assert io.rxd.value.binstr == 'zzzz'
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