Hello-
We are using the DP83865 in a new design and 10% or the prototypes can not establish a link at 1 Gbps. Some of them that can establish a link experience CRC errors. We need your help in debugging the problem. We have followed the trouble shooting guidelines and have found no apparent issues. Sometimes when we put a 100 Ohm across the differential signals the problem sometimes goes away. We have attached a scopeshot of the signal during auto negotiation as well as normal data traffic for your review.
What would cause the auto negotiate signals at the connector to be high? For example the auto-negotiation pulse is above the 2V that is shown in the troubleshooting guide. We have followed the suggested circuit and used the magnetics called out from the datasheet. What might cause the signal to be higher than 2V?
Do you have any ideas on what we can do to further narrow down the reason we are having issues? Could someone from the product group look over the layout, register settings, and schematic and see if they see any issues? If so, please contact me at timothy.starr@avnet.com so we don't publish need to them to the world.
Thanks and Best Regards,
-Tim Starr on behalf of KG@AD
