W5500 Link Led will work sometime

TCP/IP Chip W5500
#1

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!

#2

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

#3

ETHERNET PDF.pdf (22.8 KB)

#4

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.

#5

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.

#6

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.

#7

Ok, Thank you will try that.