My big problem

[sitesnima]

I am a beginner in electronics. I recently designed a board using the STM32F407VGT6 and DP83848, but after assembly and testing, I encountered a problem.

The board can be programmed and it runs, but the Ethernet section does not work properly.

It does not obtain an IP address.

And the Ethernet LED(pin 26) turns on and off occasionally , but the Ethernet connection is not actually established.



I would appreciate it if you could guide me regarding the schematic and circuit so I can solve this issue.

• I attach my pcb schematic and board

 

[rossbalch]

You might get more help on a forum more dedicated to embedded devices.

 

[Sturdag Lagernathy]

My vote is Bot..

 

[Robert]

I think it's a legit person, I found posts on another forum going back to 2018....

With that said, I'm not sure this is the best place for assistance but we do have a few STM folks here, so maybe...

 

[z2amiller]

I can't read the schematics, they're too downscaled to make out any words.

My guess is layout problems - IIUC, ethernet requires pretty careful layout (matching differential pairs, impedance matching).
Do you have a datasheet for your ethernet controller? Did you follow the layout advice? (Usually there's a reference design
somewhere in the datasheet).