This question is related to this ticket. We are facing the problem that the ethernet connection stucks sporadically. Some of our modules are showing that issue, some not. All are working on the Viola carrier board. Now i investigated the power-up sequence. Please have a look at my measurements of the 3.3V power rail during power-up: [upload|ynDMgU4mvcS7nbqfTuBLv8hRBnY=]
We are generating a lot of voltages out of the main power supply and each rail draws some ampere. Question is, is this behavior okay as the reset line is released much later (orange line)? The Colibiri datasheet states that “It is important that the main input voltage rises monotonically”, but however, the main power supply is stable when the reset line turns inactive. For reference this is the power-up measured on Viola: [upload|QPrxyAkmHEtXPHiDgsNEb6IM/T4=]
Thanks in advance.