Fastino garbage output with long sequences about artiq HOT 4 OPEN

Ok, I tested this on 4th Fastino and this one is able to sustain such a sequence on all channels for an extended period of time (tens of minutes) before the output becomes garbage.

from artiq.

Hi, (un-)fortunately I was not able to reproduce this. I tried with two Fastino 1.2.1, different EEM ports on a Kasli-SoC and with/without log2_width = 5. The output was always a stable sine on all channels (only ch0 for log2_width = 5 ofc).

The last blue trace looks suspiciously like the runaway of a CIC if the poles and zeros didn't perfectly cancel out, which happens if you somehow get an extra bit into an accumulator.

Did the red LED (indicating communication problems with Kasli) on Fastino ever turn on?

from artiq.

Red LED was off in all cases. It seems that it was the case of a quirky hw, maybe one that barely passed tests and only in longer sequences exhibited problems. I think we should wait for Fastino v1.3 and see if supply sequencing helps with intermittent issues like this.

from artiq.

While trying to reproduce your issue I also ran into some problems with the communication with Kasli. Sometimes I could turn on the red LED just by touching the negative output of a Fastino channel. Longer DMA sequences or your experiment never worked. It seems to have fixed itself after the solar storm.. 🤷

from artiq.