I have used the W5200 in a product design. We have produced roughly 50 boards so far that have had no issues. But recently we have produced 11 boards that have a problem.
When these boards are connected to a 1000Base-T LAN the Link and Speed LEDs both blink together at approximately 1Hz. When these same boards are connected to a 10/100 switch the problem goes away - they work fine at 100Base-T. I understand that this part will only operate at 10 or 100Base-T, but when connected to a 1000Base-T LAN it should still operate at 100Base-T
We are driving the Auto Negotiate (29), Duplex (30), and Speed (31) pins high - so auto negotiation should be enabled, it should be in full duplex mode, and 100Base-T mode should be enabled.
I saw some similar posts on other bulletin boards but didn’t find any conclusive answers. Has anyone else run into this?
This blinking sequence evidently serves some diagnostic purpose, does anyone know what it means?
What do the package markings on the W5200 mean? How can I determine what batch my parts were made in / what version of the silicon I am using?