W5500 Link Led will work sometime

Question

Hi, we have made W5500 custom board and SPI works fine. But when I kept chip in listen mode and Ethernet cable is connected but Link LED not establishing. I even checked the Sn_SR Register and the response I got as chip is in Listen Mode. Only two times I saw the Link LED was glowing and after that never glowed Link LED. Is there any time delay required to establish Link LED? Please help me!

Eugeny · Answer

Post circuit diagram please. |Most probably you are having the issues with PHY circuitry, or with clock circuitry.

Eugeny · Answer

Seems to be exact copy of reference schematic, except R2 which must not make a difference. Don’t you accidentally have PHY disabled through PHYCFGR? Try playing with its contents to see if there’s any change.

Century · Answer

I am always getting 10111010 response for PHYCFGR. That means it is configured correctly. In circuit TX/RX resistor values are correct? I kept 33R instead of 0R.

Eugeny · Answer

LSB of 0 suggests that there’s really no physical link. There were people changing 33 to 0, but if I recall properly it was not that bad as you describe. But anyway it is a good idea to change them to 0 (shorts) as a test. Also examine board with magnifier to ensure it has no assembly issues.

Century · Answer

Ok, Thank you will try that.

benjonson · Answer

Why my post is showing this error? Please guide me and live my post. Screenshot (238)1920×1080 225 KB