07-20-2020 03:48 PM
I included one Aurora 8b10b IP on two FPGA boards' firmware.
When these two FPGA boards' GTP transceivers are connected, both firmware should have "channel_up" HIGH automatically, which means the link is connected. As shown in the IP manual:
The sequence of Aurora IP's reset and gt_reset I applied is:
Sometimes "channel_up" doesn't go HIGH after this sequence of reset and gt_reset, but if I apply this sequence one more time, channel_up will recover.
The possibility of first time success is ~2/3.
Thank you for any replies.
07-20-2020 04:15 PM
Yes, IBERT test is pretty strange too.
With PMA loopback mode, the IBERT tests pass, both in near-end and far-end.
But with PCS loopback mode, the link shows connected, the link transmit speed is right, but with a lot of transmission errors.
07-22-2020 11:06 PM
Hi @jiongsi ,
Are you follow Power On reset Sequence ?
07-23-2020 02:03 PM
Did you test it at the time of failure? If so, see what the Eye Scan looks like.