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Tom Schouten tom at zwizwa.bePlease disregard previous report on noise. The signals are fine. My scope probe handling and soldering skills are not :) I had the probe ground connected to a 100mil header I put on BAT1 which was badly soldered. Taking it at or near the connector makes it all disappear. The reset/poweroff I'm experiencing is probably still a protocol bug, since it happens fairly predictably. On 08/16/2013 02:01 PM, Kevin Redon wrote: > Thanks for the info. > I did not looked into it yet, but will either try to fix it in software (the pullup is a good start) before designing the second version of SIMtrace, > or add a filter, cap, or pull-down if this is not possible. > > Kevin > > Excerpts from Tom Schouten's message of 2013-08-16 17:38:52 +0200: >> Hi List, >> >> When the SIMtrace ciruit operates in MitM mode, the RST and VCC lines >> coming from the phone are very noisy from I/O line crosstalk in the flex >> cable. >> I see about 2V peak-to-peak on the scope! >> >> I am expecting it leads to spurious reset/poweroff detections. >> >> It might be helpful to add a filter on the AT91 side for RST and VCC. >> Maye an R/C filter that can be enabled by an I/O pin using 0/HI-Z switching? >> >> Another idea is to do enable the internal AT91 pin pullups. >> Just loading RST and VCC a bit might be enough. >> >> ( Another alternative is to filter RST and VCC measurements in >> software. I tried this but results are not very meaningful at this >> point.. ) >> >> Cheers, >> Tom >