Agilex 5 GTS Direct PHY RX simplex cold start issue

Hello,

I have a design that instantiates the GTS Direct PHY in RX Simplex mode (1 lane). When the design is loaded from the configuration flash device, the PHY remains stuck in the “RX Data Loss / CDR Lock Loss (Auto-Recovery)” state indefinitely.

Below is a transitional-mode power-on capture (greater than 10 s):

And here is a zoomed-in view of the startup sequence showing the external resets:

When I download the same configuration as a .sof file, the receiver starts up normally — no lock-loss events are observed.

After rx_ready asserts, there are no further transitions, so the capture was stopped at that point.

Any insight or suggestions on what might cause this difference between .jic(flash) and .sof (volatile) configuration behavior would be greatly appreciated.

Thank you!