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test: relax loopback gate timing

This commit is contained in:
Sebastien Bourdeauducq 2020-09-01 17:50:09 +08:00
parent f0289d49ab
commit 4398a2d5fa
1 changed files with 3 additions and 2 deletions
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5
artiq/test/coredevice/test_rtio.py
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@ -231,17 +231,18 @@ class LoopbackGateTiming(EnvExperiment):
# With the exact delay known, make sure tight gate timings work. # With the exact delay known, make sure tight gate timings work.
# In the most common configuration, 24 mu == 24 ns == 3 coarse periods, # In the most common configuration, 24 mu == 24 ns == 3 coarse periods,
# which should be plenty of slack. # which should be plenty of slack.
# FIXME: ZC706 with NIST_QC2 needs 48ns - hw problem?
delay_mu(10000) delay_mu(10000)
gate_start_mu = now_mu() gate_start_mu = now_mu()
self.loop_in.gate_both_mu(24) self.loop_in.gate_both_mu(48) # XXX
gate_end_mu = now_mu() gate_end_mu = now_mu()
# gateware latency offset between gate and input # gateware latency offset between gate and input
lat_offset = 11*8 lat_offset = 11*8
out_mu = gate_start_mu - loop_delay_mu + lat_offset out_mu = gate_start_mu - loop_delay_mu + lat_offset
at_mu(out_mu) at_mu(out_mu)
self.loop_out.pulse_mu(24) self.loop_out.pulse_mu(48) # XXX
in_mu = self.loop_in.timestamp_mu(gate_end_mu) in_mu = self.loop_in.timestamp_mu(gate_end_mu)
print("timings: ", gate_start_mu, in_mu - lat_offset, gate_end_mu) print("timings: ", gate_start_mu, in_mu - lat_offset, gate_end_mu)