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tb: axis_mii_tx: Simulate a longer reset 

Simulate a reset lasting for at least once clock cycle to ensure our
external interfaces act sane.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Sean Anderson 2023-03-15 15:50:07 -04:00
parent d1834e2b7a
commit 599a2fce17
1 changed files with 9 additions and 6 deletions
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15
tb/axis_mii_tx.py
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@ -29,10 +29,13 @@ async def init(mac):
mac.axis_err.value = 0 mac.axis_err.value = 0
mac.short_backoff.value = 1 mac.short_backoff.value = 1
mac.half_duplex.value = 1 mac.half_duplex.value = 1
await Timer(1)
mac.rst.value = 0 async def _init():
await cocotb.start(Clock(mac.clk, 8, units='ns').start()) await Timer(1)
await FallingEdge(mac.clk) await cocotb.start(Clock(mac.clk, 8, units='ns').start())
await FallingEdge(mac.clk)
mac.rst.value = 0
await cocotb.start(_init())
def send_packet(mac, packet, **kwargs): def send_packet(mac, packet, **kwargs):
return axis_replay_buffer.send_packet({ return axis_replay_buffer.send_packet({
@ -119,11 +122,11 @@ async def get_status(mac):
underflow = 0 underflow = 0
while not (ok or gave_up or late or underflow) or mac.mii_tx_en.value: while not (ok or gave_up or late or underflow) or mac.mii_tx_en.value:
await RisingEdge(mac.clk)
ok += mac.transmit_ok.value ok += mac.transmit_ok.value
gave_up += mac.gave_up.value gave_up += mac.gave_up.value
late += mac.late_collision.value late += mac.late_collision.value
underflow += mac.underflow.value underflow += mac.underflow.value
await FallingEdge(mac.clk)
assert ok + gave_up + late + underflow == 1 assert ok + gave_up + late + underflow == 1
if ok: if ok:
@ -202,7 +205,7 @@ async def test_send(mac, ratio):
await RisingEdge(mac.clk) await RisingEdge(mac.clk)
# The first IPG may not be exact # The first IPG may not be exact
if i: if i:
assert get_sim_time('step') - start == get_sim_steps(12 * 80 - 4, 'ns') assert get_sim_time('step') - start == get_sim_steps(12 * 80, 'ns')
compare(await recv.join(), packet) compare(await recv.join(), packet)
assert await status.join() == Status.OK assert await status.join() == Status.OK