87 lines
2.9 KiB
Python
87 lines
2.9 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 cocotb
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from cocotb.clock import Clock
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from cocotb.regression import TestFactory
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from cocotb.triggers import ClockCycles, FallingEdge, RisingEdge, Timer
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from .util import ClockEnable, lookahead, timeout
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BUF_SIZE = 54
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@timeout(30, 'us')
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async def test_replay(buf, in_ratio, out_ratio):
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buf.s_axis_valid.value = 0
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buf.s_axis_last.value = 0
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buf.m_axis_ready.value = 1
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buf.replay.value = 0
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buf.done.value = 0
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await Timer(1)
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await cocotb.start(Clock(buf.clk, 8, units='ns').start())
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await FallingEdge(buf.clk)
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await cocotb.start(ClockEnable(buf.clk, buf.m_axis_ready, out_ratio))
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# A packet equal to BUF_SIZE, one around 2**BUF_WIDTH, and one around
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# 2**(BUF_WIDTH + 1) (plus some extra). This should capture most of the fun
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# conditions. We start at different data values to make sure we aren't
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# reusing anything from the last test.
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packets = [list(range(54)), list(range(64, 128)), list(range(128, 512))]
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async def send():
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for packet in packets:
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for val, last in lookahead(packet):
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buf.s_axis_data.value = val
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buf.s_axis_valid.value = 1
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buf.s_axis_last.value = last
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while True:
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await FallingEdge(buf.clk)
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if buf.s_axis_ready.value:
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break
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buf.s_axis_valid.value = 0
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if in_ratio != 1:
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await ClockCycles(buf.clk, in_ratio - 1, rising=False)
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async def recv(packet):
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async def handshake():
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while not buf.m_axis_valid.value or not buf.m_axis_ready.value:
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await RisingEdge(buf.clk)
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async def recv_len(length):
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for i, val in enumerate(packet[:length]):
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await handshake()
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assert buf.m_axis_data.value == val
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assert buf.m_axis_last == (i == len(packet) - 1)
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await RisingEdge(buf.clk)
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async def restart():
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await FallingEdge(buf.clk)
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assert buf.replayable.value
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buf.replay.value = 1
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await FallingEdge(buf.clk)
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buf.replay.value = 0
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buf.done.value = 0
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replayable = min(len(packet), BUF_SIZE)
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await recv_len(replayable - 3)
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await restart()
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await recv_len(replayable - 2)
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# As long as the packet is <= BUF_SIZE we should be able to wait
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# Try it out
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if len(packet) <= BUF_SIZE:
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await ClockCycles(buf.clk, 3)
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await restart()
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buf.done.value = 1
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await recv_len(len(packet))
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await cocotb.start(send())
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for packet in packets:
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await recv(packet)
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replay_tests = TestFactory(test_replay)
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replay_tests.add_option('in_ratio', (1, 4))
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replay_tests.add_option('out_ratio', (1, 4))
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replay_tests.generate_tests()
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