What is rx_pma_iqtxrx_clkout signal ?

Hi Sachin Jadhav, So in short, you are seeing expected behaviour in CDR AUTO mode and CDR Manual LTR mode but not on Manual LTD mode, right ? 1) CDR AUTO mode - rx_is_lockedtodata is toggling (expected with no incoming Rx data) 2) CDR Manual LTR mode - rx_is_lockedtoref stay high (expected result) 3) CDR Manual LTD mode - rx_is_lockedtodata stay high (not expected due to no incoming Rx data) May I know are you following "Resetting the Transceiver in CDR Manual Lock Mode" guideline as per below link, page 431 ? https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/arria-10/ug_arria10_xcvr_phy.pdf Can you share with me your signal_tap screenshot vs expected reset sequence timing diagram in Figure 206 ? If you are using transceiver toolkit, then you can perform serial loopback or external loopback on board via SMA cable. Directly use toolkit PRBS pattern generator to test the data traffic and CDR lock status. It's recommended to test CDR with incoming data traffic instead of no traffic condition. You can also share with me your toolkit screenshot result if you have it. Thanks. Regards, dlim