Stratrix 10 native phy transceiver

Hello, I have been trying 10G phy transceiver in simplex mode. Tx simplex phy and Rx simplex phy. I am using 2 transceivers in different banks(one acts as tx in simplex mode and other as rx in simplex mode ) . Data rate for both tx and rx phy is set as 10312.5Mhz. The Tx serial clock is connected to atx pll clock out. The clock out frequency is 5156.25MHz and reference clock frequency for atx pll is 644.53125Mhz. (atx pll ref clk, tx phy transceiver are in same bank).

on the Rx phy side, the cdr ref clk is connected to reference clk whose frequency is 644.53125MHz. (the ref clk and rx phy transceiver are in same bank).

Tx parallel data and rx parallel data are connected .

I am using an analyzer for sending traffic to rx phy and receiving from rx phy. The cdr_is_lockedtodata is 1 but cdr_is_lockedtoref signal is toggling. The received data in the analyzer has some bit errors.

I tried manually locking cdr to ref clk then the analyzer is showing received clock frequency ppm deviation >2000ppm.

I have tried with 156.25 ref clk too. Still rx cdr is unable to lock to ref clk. What could be the reason the cdr is unable to lock to reference clk ?