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AD9144 NCO ALIGNMENT with SYSREF

Question asked by Freddy_Y on Feb 20, 2018

Hi,

AD911 datasheet lists a start-up sequence (consisting of step 1 to 6, including SYSREF pulse) and a separate procedure for "NCO ALIGNMENT with SYSREF" (pag. 70) with again requires a SYSREF pulse.

When is the user supposed to send the procedure for "NCO ALIGNMENT with SYSREF"?

 

The request  might seems trivial but, using a "try and see" approach, I didn't find a simple solution using a single SYSREF pulse.

I ended-up sending step 1 to 6 and then "NCO ALIGNMENT with SYSREF" but sometimes the LANEFIFOERR shows up (reg 0x023, Lane FIFO Error Status latched alarm when IRQEN_SMODE_LANEFIFOERR is high).

 

Thanks,

Federico

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