For my application, the main idea is to use only one lane of QSFP to obtain a 10GbE connection with the RFSoC 4x2 board.
I instantiated a 10GbE core (PHY+MAC+UDP), by mapping only one lane, and then a connection to a PC or a switch by a QSFP to SFP breakout cable is performed.
I am experiencing a problem with that, because I observe ARP packets transmitted from the board, but no data are received. As far as I am concerned, I think the core code is OK, because it has been validated and used in a ZCU208.
By checking in schematics,
it seems that MGTYTX and MGTYRX are swapped. More specifically, it appears the following:
MGTYTXP0_128 (Y35) and MGTYTXN0_128 (Y36) are connected to QSFP_TX1_P and _N respectively.
MGTYRXP0_128 (AA38) and MGTYRXN0_128 (AA39) are connected to QSFP_RX4_P and _N respectively. Instead, I would expect a connection to QSFP_RX1_P and _N.
It could be compatible with what I have observed (TX packet and NO RX). Furthermore, other different lanes have been tried with no change in the final result.
Is there something I’m not understanding and am missing? Any suggestion? Thank you very much in advance.