Hello,
i have problems with connecting the TM4C129 ethernet interface to a switch (KSZ8999I). The distance between the chips is only about 4 inches. Thereby some devices are working, other don't. Schematic and a few measurements are attached, the signals name is defined in the schematic.
The devices are working with different supply voltages and are capacitive coupeled.
It seems, that the TM4C129 works with class B ethernet driver. Is there the possibility to change this in a register? Can you give me informations about the impedance of the TM4C129 when the output driver is in receiver mode?
I have found application notes for capacitive coupling when operating with same supply voltage at both microcontroller and switch. Are there also some notes when operating with different supply voltages?
Thank you for your support.
Regards,
Matthias
