Hi. I saw that there is difference between application note and datasheet of W5500.
What should I do with RSVD pins?
There is schematic where each RSVD pin is floating (application note)
In datasheet there is information that
23 RSVD Pull-down I It must be tied to GND and Rest sould be floating.
There is W5500 devboard where each RSVD is connected to GND via 10k resistor.
What should I do?
These pins are already having internal pull-downs averaging at 85k. Thus the question is are these internal pull-downs enough and why some circuits have external pull-downs, and some not?
Yes, i saw that here are pulldowns at RSVD pins.
So when RSVD should have external pull down?
No idea. We must wait for WIZnet R&D to advise. If you need to make a design right now, just leave seats for those resistors, and will decide if to populate them or not later.
Thanks Eugeny. So we will wait
As Eugeny said, W5500 RSVD pin has internal pull-down(thanks Eugeny!).
The internal pull-down resistance value of 85K is too large and can be swayed by external noise. That’s why we used an external pull-down resistance of about 10K.
Reset pin is internal pull-up but as the same reason with RVSD pin, it can be use with external pull-up.