When bringing up a board for the first time and the High Speed Ethernet IP core does not seem to be achieving lane alignment, the most likely issue is related to signal integrity.
Important: Signal integrity issues must be addressed before any other
debugging can take place.
Even if lane alignment is achieved, if there are periodic bip-8 errors, signal integrity issues are indicated. Check the bip-8 signals to assist with debug.
Signal integrity should be debugged independently from the High Speed Ethernet IP core. The following procedures should be carried out.
Note: It assumed that the PCB itself has been designed and manufactured in
accordance with the required trace impedances and trace lengths, including the
requirements for skew set out in the IEEE Standard for Ethernet (IEEE Std
802.3-2015).
- Transceiver settings
- Checking for noise
- Bit error rate testing
If assistance is required for transceiver and signal integrity debugging, contact Xilinx technical support.