Tool/software:
Hello,
my coworkers were recently tested ESD immunity of the board with DP83825 Ethernet PHY.
Despite some work on the protection, complete reliability was not achieved. Often PHY is losing link and not restoring it after discharge. When PHY registers are read back, they seem (only few important were tested) to be unchanged, which probably means that this is not a reset issue. Another observation: resetting (using physical RESET line, software-only reset was not tested) and reconfiguring PHY brings link back, so full power down/up cycle is not necessary to recover. Do you have any suggestions how to test it further or perhaps how to detect this unusual PHY state?
From my understanding DP83825, DP83826 and DP83822 belong to the same family but have different ESD immunity, in increasing order. Changing PHY to another one might be an option, what would be your stance on in?
