Occasional Contributor
Regular ContributorHi,
In order to better understand the problem, do you mean if you enable the internal serial loopback (no using cable), the same problem is observed if the temperature rises above 55C, while the PCIe and other functions are still working well?
How many devices have a similar problem? Could you please try to test on another channel to determine if there is any channel dependency on this particular device?
Regards -SK
Occasional ContributorHi,
You are right. Using the internal loopback(from transmitter's PCS output loopback to input of receiver's PCS) at the xgmii interface of the transceiver we get wrong data(mainly losing a 64-bit word in a packet) when operation temperature rises to 55C. Since when you loopback, the data actually is sent to the remote receiver over the fiber link too, so we can see at the remote receiver output that we get the same loss of data as the loopback output.
For the design, we get clean timing analyzer result without any timing violations.
We have total five boards. They fail at different temperature, the lowest is 55C and the highest is 72C not reaching to the specified 100C. In board design we only use one transceiver as a 10Gbps fiber link. It may not easy to switch to other transceiver in the FPGA to test other channels.
Thanks. Looking forward to your further helps.
